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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
A generalized Hilbert operatoracting on mean Lipschitz spaces
Noel MerchánUniversidad de Málaga, Spain
Madrid International Workshop onOperator Theory and Function Spaces
Madrid, Spain. October 16, 2018
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 2: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/2.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Index
1 Notation and definitions
2 Generalized Hilbert matrixHilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
3 Mean Lipschitz spaces
4 Hµ acting on mean Lipschitz spaces
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 3: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/3.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
The unit disc and the unit circleD = {z ∈ C : |z| < 1}, the unit disc.T = {ξ ∈ C : |ξ| = 1}, the unit circle.
Spaces of analytic functions in the unit disc
Hol(D) is the space of all analytic functions in D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 4: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/4.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
The unit disc and the unit circleD = {z ∈ C : |z| < 1}, the unit disc.T = {ξ ∈ C : |ξ| = 1}, the unit circle.
Spaces of analytic functions in the unit disc
Hol(D) is the space of all analytic functions in D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 5: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/5.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
The unit disc and the unit circleD = {z ∈ C : |z| < 1}, the unit disc.T = {ξ ∈ C : |ξ| = 1}, the unit circle.
Spaces of analytic functions in the unit disc
Hol(D) is the space of all analytic functions in D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 6: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/6.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
The unit disc and the unit circleD = {z ∈ C : |z| < 1}, the unit disc.T = {ξ ∈ C : |ξ| = 1}, the unit circle.
Spaces of analytic functions in the unit disc
Hol(D) is the space of all analytic functions in D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 7: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/7.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
The unit disc and the unit circleD = {z ∈ C : |z| < 1}, the unit disc.T = {ξ ∈ C : |ξ| = 1}, the unit circle.
Spaces of analytic functions in the unit disc
Hol(D) is the space of all analytic functions in D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 8: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/8.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hardy spaces
If 0 < r < 1 and f ∈ Hol(D), we set
Mp(r , f ) =
(1
2π
∫ 2π
0|f (reit )|p dt
)1/p
, 0 < p <∞,
M∞(r , f ) = sup|z|=r|f (z)|.
If 0 < p ≤ ∞, we consider the Hardy spaces Hp,
Hp =
{f ∈ Hol(D) : ‖f‖Hp
def= sup
0<r<1Mp(r , f ) <∞
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 9: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/9.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hardy spaces
If 0 < r < 1 and f ∈ Hol(D), we set
Mp(r , f ) =
(1
2π
∫ 2π
0|f (reit )|p dt
)1/p
, 0 < p <∞,
M∞(r , f ) = sup|z|=r|f (z)|.
If 0 < p ≤ ∞, we consider the Hardy spaces Hp,
Hp =
{f ∈ Hol(D) : ‖f‖Hp
def= sup
0<r<1Mp(r , f ) <∞
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 10: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/10.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hardy spaces
If 0 < r < 1 and f ∈ Hol(D), we set
Mp(r , f ) =
(1
2π
∫ 2π
0|f (reit )|p dt
)1/p
, 0 < p <∞,
M∞(r , f ) = sup|z|=r|f (z)|.
If 0 < p ≤ ∞, we consider the Hardy spaces Hp,
Hp =
{f ∈ Hol(D) : ‖f‖Hp
def= sup
0<r<1Mp(r , f ) <∞
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 11: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/11.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
BMOA
BMOA ={
f ∈ H1 : f(
eiθ)∈ BMO
}.
Bloch space
B =
{f ∈ Hol(D) : sup
z∈D(1− |z|2)|f ′(z)| <∞
}.
H∞ ⊂ BMOA ⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
BMOA
BMOA ={
f ∈ H1 : f(
eiθ)∈ BMO
}.
Bloch space
B =
{f ∈ Hol(D) : sup
z∈D(1− |z|2)|f ′(z)| <∞
}.
H∞ ⊂ BMOA ⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
BMOA
BMOA =
{f ∈ H2 : sup
a∈D‖f ◦ ϕa − f (a)‖H2 <∞
}.
Where ϕa(z) = z−a1−az , a ∈ D.
Bloch space
B =
{f ∈ Hol(D) : sup
z∈D(1− |z|2)|f ′(z)| <∞
}.
H∞ ⊂ BMOA ⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
BMOA
BMOA =
{f ∈ H2 : sup
a∈D‖f ◦ ϕa − f (a)‖H2 <∞
}.
Where ϕa(z) = z−a1−az , a ∈ D.
Bloch space
B =
{f ∈ Hol(D) : sup
z∈D(1− |z|2)|f ′(z)| <∞
}.
H∞ ⊂ BMOA ⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 15: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/15.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
BMOA
BMOA =
{f ∈ H2 : sup
a∈D‖f ◦ ϕa − f (a)‖H2 <∞
}.
Where ϕa(z) = z−a1−az , a ∈ D.
Bloch space
B =
{f ∈ Hol(D) : sup
z∈D(1− |z|2)|f ′(z)| <∞
}.
H∞ ⊂ BMOA ⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 16: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/16.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixLet H be the Hilbert matrix,
H =
(1
n + k + 1
)n,k≥0
.
H =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 17: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/17.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixLet H be the Hilbert matrix,
H =
(1
n + k + 1
)n,k≥0
.
H =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 18: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/18.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixLet H be the Hilbert matrix,
H =
(1
n + k + 1
)n,k≥0
.
H =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 19: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/19.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixThe Hilbert matrix H can be viewed as an operator betweensequence spaces.
H ({an}∞n=0) =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
a0a1a2a3...
,
{an}∞n=0 7→
{ ∞∑k=0
ak
n + k + 1
}∞n=0
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 20: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/20.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixThe Hilbert matrix H can be viewed as an operator betweensequence spaces.
H ({an}∞n=0) =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
a0a1a2a3...
,
{an}∞n=0 7→
{ ∞∑k=0
ak
n + k + 1
}∞n=0
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 21: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/21.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixThe Hilbert matrix H can be viewed as an operator betweensequence spaces.
H ({an}∞n=0) =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
a0a1a2a3...
,
{an}∞n=0 7→
{ ∞∑k=0
ak
n + k + 1
}∞n=0
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 22: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/22.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrixThe Hilbert matrix H can be viewed as an operator betweensequence spaces.
H ({an}∞n=0) =
1 1/2 1/3 1/4 . . .
1/2 1/3 1/4 1/5 . . .1/3 1/4 1/5 1/6 . . .1/4 1/5 1/6 1/7 . . .
......
......
. . .
a0a1a2a3...
,
{an}∞n=0 7→
{ ∞∑k=0
ak
n + k + 1
}∞n=0
.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 23: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/23.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
In the same way we can consider H as an operator in Hol(D)multiplicating the matrix by the sequence of Taylor coefficients
of a function f (z) =∞∑
n=0anzn ∈ Hol(D).
We define formally the operator in Hol(D)
H(f )(z) =∞∑
n=0
( ∞∑k=0
ak
n + k + 1
)zn.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 24: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/24.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
In the same way we can consider H as an operator in Hol(D)multiplicating the matrix by the sequence of Taylor coefficients
of a function f (z) =∞∑
n=0anzn ∈ Hol(D).
We define formally the operator in Hol(D)
H(f )(z) =∞∑
n=0
( ∞∑k=0
ak
n + k + 1
)zn.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 25: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/25.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
In the same way we can consider H as an operator in Hol(D)multiplicating the matrix by the sequence of Taylor coefficients
of a function f (z) =∞∑
n=0anzn ∈ Hol(D).
We define formally the operator in Hol(D)
H(f )(z) =∞∑
n=0
( ∞∑k=0
ak
n + k + 1
)zn.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 26: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/26.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrix as an operator
The operator H is well defined on H1.The operator H : Hp → Hp is bounded if 1 < p <∞,(Diamantopoulos & Siskakis, 2000).Dostanic, Jevtic & Vukotic (2008) found the exact norm of H asan operator from Hp to Hp (1 < p <∞).However, H is not bounded on H1 and neither on H∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 27: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/27.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrix as an operator
The operator H is well defined on H1.The operator H : Hp → Hp is bounded if 1 < p <∞,(Diamantopoulos & Siskakis, 2000).Dostanic, Jevtic & Vukotic (2008) found the exact norm of H asan operator from Hp to Hp (1 < p <∞).However, H is not bounded on H1 and neither on H∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 28: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/28.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrix as an operator
The operator H is well defined on H1.The operator H : Hp → Hp is bounded if 1 < p <∞,(Diamantopoulos & Siskakis, 2000).Dostanic, Jevtic & Vukotic (2008) found the exact norm of H asan operator from Hp to Hp (1 < p <∞).However, H is not bounded on H1 and neither on H∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 29: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/29.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrix as an operator
The operator H is well defined on H1.The operator H : Hp → Hp is bounded if 1 < p <∞,(Diamantopoulos & Siskakis, 2000).Dostanic, Jevtic & Vukotic (2008) found the exact norm of H asan operator from Hp to Hp (1 < p <∞).However, H is not bounded on H1 and neither on H∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 30: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/30.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Hilbert matrix as an operator
The operator H is well defined on H1.The operator H : Hp → Hp is bounded if 1 < p <∞,(Diamantopoulos & Siskakis, 2000).Dostanic, Jevtic & Vukotic (2008) found the exact norm of H asan operator from Hp to Hp (1 < p <∞).However, H is not bounded on H1 and neither on H∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 31: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/31.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
A generalized Hilbert matrix
Let µ be a finite positive Borel measure on [0,1).Let Hµ = (µn,k )n,k≥0 be the Hankel matrix with entries
µn,k =
∫[0,1)
tn+k dµ(t).
Hµ =
µ0 µ1 µ2 µ3 · · ·µ1 µ2 µ3 µ4 · · ·µ2 µ3 µ4 µ5 · · ·µ3 µ4 µ5 µ6 · · ·...
......
.... . .
.
If µ is the Lebesgue measure on the interval [0,1) we get theclassical Hilbert matrix.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 32: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/32.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
A generalized Hilbert matrix
Let µ be a finite positive Borel measure on [0,1).Let Hµ = (µn,k )n,k≥0 be the Hankel matrix with entries
µn,k =
∫[0,1)
tn+k dµ(t).
Hµ =
µ0 µ1 µ2 µ3 · · ·µ1 µ2 µ3 µ4 · · ·µ2 µ3 µ4 µ5 · · ·µ3 µ4 µ5 µ6 · · ·...
......
.... . .
.
If µ is the Lebesgue measure on the interval [0,1) we get theclassical Hilbert matrix.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 33: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/33.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
A generalized Hilbert matrix
Let µ be a finite positive Borel measure on [0,1).Let Hµ = (µn,k )n,k≥0 be the Hankel matrix with entries
µn,k =
∫[0,1)
tn+k dµ(t).
Hµ =
µ0 µ1 µ2 µ3 · · ·µ1 µ2 µ3 µ4 · · ·µ2 µ3 µ4 µ5 · · ·µ3 µ4 µ5 µ6 · · ·...
......
.... . .
.
If µ is the Lebesgue measure on the interval [0,1) we get theclassical Hilbert matrix.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 34: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/34.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
A generalized Hilbert matrix
Let µ be a finite positive Borel measure on [0,1).Let Hµ = (µn,k )n,k≥0 be the Hankel matrix with entries
µn,k =
∫[0,1)
tn+k dµ(t).
Hµ =
µ0 µ1 µ2 µ3 · · ·µ1 µ2 µ3 µ4 · · ·µ2 µ3 µ4 µ5 · · ·µ3 µ4 µ5 µ6 · · ·...
......
.... . .
.
If µ is the Lebesgue measure on the interval [0,1) we get theclassical Hilbert matrix.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 35: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/35.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
A generalized Hilbert matrix
Let µ be a finite positive Borel measure on [0,1).Let Hµ = (µn,k )n,k≥0 be the Hankel matrix with entries
µn,k =
∫[0,1)
tn+k dµ(t).
Hµ =
µ0 µ1 µ2 µ3 · · ·µ1 µ2 µ3 µ4 · · ·µ2 µ3 µ4 µ5 · · ·µ3 µ4 µ5 µ6 · · ·...
......
.... . .
.
If µ is the Lebesgue measure on the interval [0,1) we get theclassical Hilbert matrix.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 36: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/36.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
The matrix Hµ induces formally an operator on Hol(D) in thesame way than H:
Hµ(f )(z) =∞∑
n=0
( ∞∑k=0
µn,kak
)zn.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 37: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/37.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
The matrix Hµ induces formally an operator on Hol(D) in thesame way than H:
Hµ(f )(z) =∞∑
n=0
( ∞∑k=0
µn,kak
)zn.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 38: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/38.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Integral operator
For a finite positive Borel measure on [0,1) µ we also definethe integral operator
Iµ(f )(z) =
∫[0,1)
f (t)1− tz
dµ(t),
when the right side has sense and it defines an analyticfunction.Hµ and Iµ are closely related. If f ∈ Hol(D) is good enoughthen Hµ(f ) = Iµ(f ).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 39: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/39.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Integral operator
For a finite positive Borel measure on [0,1) µ we also definethe integral operator
Iµ(f )(z) =
∫[0,1)
f (t)1− tz
dµ(t),
when the right side has sense and it defines an analyticfunction.Hµ and Iµ are closely related. If f ∈ Hol(D) is good enoughthen Hµ(f ) = Iµ(f ).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 40: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/40.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Integral operator
For a finite positive Borel measure on [0,1) µ we also definethe integral operator
Iµ(f )(z) =
∫[0,1)
f (t)1− tz
dµ(t),
when the right side has sense and it defines an analyticfunction.Hµ and Iµ are closely related. If f ∈ Hol(D) is good enoughthen Hµ(f ) = Iµ(f ).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 41: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/41.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet I be an interval of T. We define the Carleson squareassociated to I asS(I) = {reiθ : eiθ ∈ I, 1− |I|2π ≤ r < 1}.
0 S( I ) I
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 42: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/42.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet I be an interval of T. We define the Carleson squareassociated to I asS(I) = {reiθ : eiθ ∈ I, 1− |I|2π ≤ r < 1}.
0 S( I ) I
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 43: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/43.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet I be an interval of T. We define the Carleson squareassociated to I asS(I) = {reiθ : eiθ ∈ I, 1− |I|2π ≤ r < 1}.
0 S( I ) I
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 44: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/44.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet I be an interval of T. We define the Carleson squareassociated to I asS(I) = {reiθ : eiθ ∈ I, 1− |I|2π ≤ r < 1}.
0 S( I ) I
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 45: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/45.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet µ be a finite measure on D. µ is a Carleson measure ifthere is a constant C > 0 such that
µ (S(I)) ≤ C|I| for every I ⊂ T interval.
Theorem (Carleson, 1962)Let µ be a finite measure on D. Then µ is a Carleson measureif and only if there exist a constant C > 0 such that∫
D|f (z)|dµ(z) ≤ C‖f‖H1 for all f ∈ H1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 46: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/46.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet µ be a finite measure on D. µ is a Carleson measure ifthere is a constant C > 0 such that
µ (S(I)) ≤ C|I| for every I ⊂ T interval.
Theorem (Carleson, 1962)Let µ be a finite measure on D. Then µ is a Carleson measureif and only if there exist a constant C > 0 such that∫
D|f (z)|dµ(z) ≤ C‖f‖H1 for all f ∈ H1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 47: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/47.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
DefinitionLet µ be a finite measure on D. µ is a Carleson measure ifthere is a constant C > 0 such that
µ (S(I)) ≤ C|I| for every I ⊂ T interval.
Theorem (Carleson, 1962)Let µ be a finite measure on D. Then µ is a Carleson measureif and only if there exist a constant C > 0 such that∫
D|f (z)|dµ(z) ≤ C‖f‖H1 for all f ∈ H1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 48: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/48.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Logarithmic Carleson measuresLet µ be a positive Borel measure on D, 0 ≤ α <∞, and0 < s <∞ we say that µ is an α-logarithmic s-Carlesonmeasure if there exists a positive constant C such that
µ (S(I))
(log
2π|I|
)α≤ C|I|s, for any interval I ⊂ T.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 49: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/49.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Logarithmic Carleson measuresLet µ be a positive Borel measure on D, 0 ≤ α <∞, and0 < s <∞ we say that µ is an α-logarithmic s-Carlesonmeasure if there exists a positive constant C such that
µ (S(I))
(log
2π|I|
)α≤ C|I|s, for any interval I ⊂ T.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 50: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/50.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Widom (1966) and Power (1980) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)from H2 into itself.
Galanopoulos and Peláez (2010) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)in the Hardy space H1.
Chatzifountas, Girela and Peláez (2013) described thosepositive Borel measures on [0,1) such that Hµ is bounded (orcompact) from Hp into Hq with 0 < p,q <∞.
Girela and M. (2017) described those positive Borel measureson [0,1) such that Hµ is bounded on conformally invariantspaces.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 51: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/51.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Widom (1966) and Power (1980) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)from H2 into itself.
Galanopoulos and Peláez (2010) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)in the Hardy space H1.
Chatzifountas, Girela and Peláez (2013) described thosepositive Borel measures on [0,1) such that Hµ is bounded (orcompact) from Hp into Hq with 0 < p,q <∞.
Girela and M. (2017) described those positive Borel measureson [0,1) such that Hµ is bounded on conformally invariantspaces.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 52: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/52.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Widom (1966) and Power (1980) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)from H2 into itself.
Galanopoulos and Peláez (2010) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)in the Hardy space H1.
Chatzifountas, Girela and Peláez (2013) described thosepositive Borel measures on [0,1) such that Hµ is bounded (orcompact) from Hp into Hq with 0 < p,q <∞.
Girela and M. (2017) described those positive Borel measureson [0,1) such that Hµ is bounded on conformally invariantspaces.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 53: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/53.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Widom (1966) and Power (1980) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)from H2 into itself.
Galanopoulos and Peláez (2010) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)in the Hardy space H1.
Chatzifountas, Girela and Peláez (2013) described thosepositive Borel measures on [0,1) such that Hµ is bounded (orcompact) from Hp into Hq with 0 < p,q <∞.
Girela and M. (2017) described those positive Borel measureson [0,1) such that Hµ is bounded on conformally invariantspaces.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 54: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/54.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Widom (1966) and Power (1980) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)from H2 into itself.
Galanopoulos and Peláez (2010) characterized those positiveBorel measures on [0,1) such that Hµ is bounded (or compact)in the Hardy space H1.
Chatzifountas, Girela and Peláez (2013) described thosepositive Borel measures on [0,1) such that Hµ is bounded (orcompact) from Hp into Hq with 0 < p,q <∞.
Girela and M. (2017) described those positive Borel measureson [0,1) such that Hµ is bounded on conformally invariantspaces.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 55: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/55.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) such that∫[0,1) log 2
1−t dµ(t) < ∞. Then the following three conditionsare equivalent:
(i) The operator Iµ is bounded from B into BMOA.(ii) The operator Iµ is bounded from BMOA into itself.(iii) The measure µ is a 1-logarithmic 1-Carleson measure.Moreover, if (i) holds, then the operator Hµ is also well definedon the Bloch space and
Hµ(f ) = Iµ(f ), for all f ∈ B,
and hence the operator Hµ is bounded from B into BMOA.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 56: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/56.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) such that∫[0,1) log 2
1−t dµ(t) < ∞. Then the following three conditionsare equivalent:
(i) The operator Iµ is bounded from B into BMOA.(ii) The operator Iµ is bounded from BMOA into itself.(iii) The measure µ is a 1-logarithmic 1-Carleson measure.Moreover, if (i) holds, then the operator Hµ is also well definedon the Bloch space and
Hµ(f ) = Iµ(f ), for all f ∈ B,
and hence the operator Hµ is bounded from B into BMOA.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 57: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/57.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) such that∫[0,1) log 2
1−t dµ(t) < ∞. Then the following three conditionsare equivalent:
(i) The operator Iµ is bounded from B into BMOA.(ii) The operator Iµ is bounded from BMOA into itself.(iii) The measure µ is a 1-logarithmic 1-Carleson measure.Moreover, if (i) holds, then the operator Hµ is also well definedon the Bloch space and
Hµ(f ) = Iµ(f ), for all f ∈ B,
and hence the operator Hµ is bounded from B into BMOA.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 58: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/58.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Qs spacesFor 0 ≤ s <∞ we define the space Qs as
Qs =
{f ∈ Hol(D) : sup
a∈D
∫D|f ′(z)|2(1− |ϕa(z)|2)s dA(z) <∞
}.
D ( Qs1 ( Qs2 ( BMOA = Q1 ( B = Qs, 0 < s1 < s2 < 1 < s.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 59: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/59.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Qs spacesFor 0 ≤ s <∞ we define the space Qs as
Qs =
{f ∈ Hol(D) : sup
a∈D
∫D|f ′(z)|2(1− |ϕa(z)|2)s dA(z) <∞
}.
D ( Qs1 ( Qs2 ( BMOA = Q1 ( B = Qs, 0 < s1 < s2 < 1 < s.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Qs spacesFor 0 ≤ s <∞ we define the space Qs as
Qs =
{f ∈ Hol(D) : sup
a∈D
∫D|f ′(z)|2(1− |ϕa(z)|2)s dA(z) <∞
}.
D ( Qs1 ( Qs2 ( BMOA = Q1 ( B = Qs, 0 < s1 < s2 < 1 < s.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) and let0 < s1, s2 <∞. Then the following conditions are equivalent.
(i) The operator Iµ is well defined in Qs1 and, furthermore, it isa bounded operator from Qs1 into Qs2 .
(ii) The operator Hµ is well defined in Qs1 and, furthermore, itis a bounded operator from Qs1 into Qs2 .
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) and let0 < s1, s2 <∞. Then the following conditions are equivalent.
(i) The operator Iµ is well defined in Qs1 and, furthermore, it isa bounded operator from Qs1 into Qs2 .
(ii) The operator Hµ is well defined in Qs1 and, furthermore, itis a bounded operator from Qs1 into Qs2 .
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Λ21/2 =
{f ∈ Hol(D) : M2(r , f ′) = O
(1
(1− r)1/2
)}.
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Λ21/2 =
{f ∈ Hol(D) : M2(r , f ′) = O
(1
(1− r)1/2
)}.
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Hilbert matrixA generalized Hilbert matrixIntegral operatorCarleson measures
Λ21/2 =
{f ∈ Hol(D) : M2(r , f ′) = O
(1
(1− r)1/2
)}.
Theorem (Girela, M.)
Let µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Integral modulus of continuity
If f ∈ Hol(D) has a non-tangential limit f (eiθ) at almost everyeiθ ∈ T and δ > 0, we define for 1 ≤ p <∞
ωp(δ, f ) = sup0<|t |≤δ
(1
2π
∫ π
−π
∣∣∣f (ei(θ+t))− f (eiθ)∣∣∣p dθ
)1/p
,
and for p =∞ we define
ω∞(δ, f ) = sup0<|t |≤δ
(ess. supθ∈[−π,π]
|f (ei(θ+t))− f (eiθ)|
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Integral modulus of continuity
If f ∈ Hol(D) has a non-tangential limit f (eiθ) at almost everyeiθ ∈ T and δ > 0, we define for 1 ≤ p <∞
ωp(δ, f ) = sup0<|t |≤δ
(1
2π
∫ π
−π
∣∣∣f (ei(θ+t))− f (eiθ)∣∣∣p dθ
)1/p
,
and for p =∞ we define
ω∞(δ, f ) = sup0<|t |≤δ
(ess. supθ∈[−π,π]
|f (ei(θ+t))− f (eiθ)|
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Integral modulus of continuity
If f ∈ Hol(D) has a non-tangential limit f (eiθ) at almost everyeiθ ∈ T and δ > 0, we define for 1 ≤ p <∞
ωp(δ, f ) = sup0<|t |≤δ
(1
2π
∫ π
−π
∣∣∣f (ei(θ+t))− f (eiθ)∣∣∣p dθ
)1/p
,
and for p =∞ we define
ω∞(δ, f ) = sup0<|t |≤δ
(ess. supθ∈[−π,π]
|f (ei(θ+t))− f (eiθ)|
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Mean Lipschitz spacesGiven 1 ≤ p ≤ ∞ and 0 < α ≤ 1, we define the mean Lipschitzspace Λp
α as
Λpα =
{f ∈ Hol(D) : ∃ f (eiθ) a.e. θ, ωp(δ, f ) = O(δα), as δ → 0
}.
Theorem (Hardy & Littlewood, 1932)
If 1 ≤ p ≤ ∞ and 0 < α ≤ 1 then we have that Λpα ⊂ Hp and
Λpα =
{f ∈ Hol(D) : Mp(r , f ′) = O
(1
(1− r)1−α
)}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Mean Lipschitz spacesGiven 1 ≤ p ≤ ∞ and 0 < α ≤ 1, we define the mean Lipschitzspace Λp
α as
Λpα =
{f ∈ Hol(D) : ∃ f (eiθ) a.e. θ, ωp(δ, f ) = O(δα), as δ → 0
}.
Theorem (Hardy & Littlewood, 1932)
If 1 ≤ p ≤ ∞ and 0 < α ≤ 1 then we have that Λpα ⊂ Hp and
Λpα =
{f ∈ Hol(D) : Mp(r , f ′) = O
(1
(1− r)1−α
)}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Mean Lipschitz spacesGiven 1 ≤ p ≤ ∞ and 0 < α ≤ 1, we define the mean Lipschitzspace Λp
α as
Λpα =
{f ∈ Hol(D) : ∃ f (eiθ) a.e. θ, ωp(δ, f ) = O(δα), as δ → 0
}.
Theorem (Hardy & Littlewood, 1932)
If 1 ≤ p ≤ ∞ and 0 < α ≤ 1 then we have that Λpα ⊂ Hp and
Λpα =
{f ∈ Hol(D) : Mp(r , f ′) = O
(1
(1− r)1−α
)}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Mean Lipschitz spacesGiven 1 ≤ p ≤ ∞ and 0 < α ≤ 1, we define the mean Lipschitzspace Λp
α as
Λpα =
{f ∈ Hol(D) : ∃ f (eiθ) a.e. θ, ωp(δ, f ) = O(δα), as δ → 0
}.
Theorem (Hardy & Littlewood, 1932)
If 1 ≤ p ≤ ∞ and 0 < α ≤ 1 then we have that Λpα ⊂ Hp and
Λpα =
{f ∈ Hol(D) : Mp(r , f ′) = O
(1
(1− r)1−α
)}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
If 1 < p <∞ and α > 1p then Λp
α ⊂ A ⊂ H∞.
If 1 < p <∞ and α = 1p then f (z) = log
(1
1−z
)∈ Λp
1/p.
Theorem (Bourdon, Shapiro, Sledd, 1989)
Λp1/p ⊂ Λq
1/q ⊂ BMOA ⊂ B, 1 ≤ p < q <∞.
This result is sharp in a very strong sense.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
If 1 < p <∞ and α > 1p then Λp
α ⊂ A ⊂ H∞.
If 1 < p <∞ and α = 1p then f (z) = log
(1
1−z
)∈ Λp
1/p.
Theorem (Bourdon, Shapiro, Sledd, 1989)
Λp1/p ⊂ Λq
1/q ⊂ BMOA ⊂ B, 1 ≤ p < q <∞.
This result is sharp in a very strong sense.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
If 1 < p <∞ and α > 1p then Λp
α ⊂ A ⊂ H∞.
If 1 < p <∞ and α = 1p then f (z) = log
(1
1−z
)∈ Λp
1/p.
Theorem (Bourdon, Shapiro, Sledd, 1989)
Λp1/p ⊂ Λq
1/q ⊂ BMOA ⊂ B, 1 ≤ p < q <∞.
This result is sharp in a very strong sense.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 76: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/76.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Generalization of Λpα spaces
Let ω : [0, π]→ [0,∞) be a continuous and increasing functionwith ω(0) = 0 and ω(t) > 0 if t > 0.Then, for 1 ≤ p ≤ ∞, the mean Lipschitz space Λ(p, ω) isdefined as
Λ(p, ω) = {f ∈ Hp : ωp(δ, f ) = O(ω(δ)), as δ → 0} .
With this notation Λpα = Λ(p, δα).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Generalization of Λpα spaces
Let ω : [0, π]→ [0,∞) be a continuous and increasing functionwith ω(0) = 0 and ω(t) > 0 if t > 0.Then, for 1 ≤ p ≤ ∞, the mean Lipschitz space Λ(p, ω) isdefined as
Λ(p, ω) = {f ∈ Hp : ωp(δ, f ) = O(ω(δ)), as δ → 0} .
With this notation Λpα = Λ(p, δα).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Generalization of Λpα spaces
Let ω : [0, π]→ [0,∞) be a continuous and increasing functionwith ω(0) = 0 and ω(t) > 0 if t > 0.Then, for 1 ≤ p ≤ ∞, the mean Lipschitz space Λ(p, ω) isdefined as
Λ(p, ω) = {f ∈ Hp : ωp(δ, f ) = O(ω(δ)), as δ → 0} .
With this notation Λpα = Λ(p, δα).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Generalization of Λpα spaces
Let ω : [0, π]→ [0,∞) be a continuous and increasing functionwith ω(0) = 0 and ω(t) > 0 if t > 0.Then, for 1 ≤ p ≤ ∞, the mean Lipschitz space Λ(p, ω) isdefined as
Λ(p, ω) = {f ∈ Hp : ωp(δ, f ) = O(ω(δ)), as δ → 0} .
With this notation Λpα = Λ(p, δα).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Dini conditionWe say that ω satisfies the Dini condition if there exists apositive constant C such that∫ δ
0
ω(t)t
dt ≤ Cω(δ), 0 < δ < 1.
Condition b1
We say that ω satisfies the b1 condition if there exists a positiveconstant C such that∫ π
δ
ω(t)t2 dt ≤ C
ω(δ)
δ, 0 < δ < 1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Dini conditionWe say that ω satisfies the Dini condition if there exists apositive constant C such that∫ δ
0
ω(t)t
dt ≤ Cω(δ), 0 < δ < 1.
Condition b1
We say that ω satisfies the b1 condition if there exists a positiveconstant C such that∫ π
δ
ω(t)t2 dt ≤ C
ω(δ)
δ, 0 < δ < 1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Dini conditionWe say that ω satisfies the Dini condition if there exists apositive constant C such that∫ δ
0
ω(t)t
dt ≤ Cω(δ), 0 < δ < 1.
Condition b1
We say that ω satisfies the b1 condition if there exists a positiveconstant C such that∫ π
δ
ω(t)t2 dt ≤ C
ω(δ)
δ, 0 < δ < 1.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 83: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/83.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Admissible weights
AW = Dini ∩ b1.
Theorem (Blasco & de Souza, 1990)If 1 ≤ p ≤ ∞ and ω ∈ AW then,
Λ(p, ω) =
{f ∈ Hol(D) : Mp(r , f ′) = O
(ω(1− r)
1− r
), as r → 1
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 84: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/84.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Admissible weights
AW = Dini ∩ b1.
Theorem (Blasco & de Souza, 1990)If 1 ≤ p ≤ ∞ and ω ∈ AW then,
Λ(p, ω) =
{f ∈ Hol(D) : Mp(r , f ′) = O
(ω(1− r)
1− r
), as r → 1
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 85: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/85.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Admissible weights
AW = Dini ∩ b1.
Theorem (Blasco & de Souza, 1990)If 1 ≤ p ≤ ∞ and ω ∈ AW then,
Λ(p, ω) =
{f ∈ Hol(D) : Mp(r , f ′) = O
(ω(1− r)
1− r
), as r → 1
}.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 86: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/86.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
If 1 < p <∞ and α > 1p then Λp
α ⊂ A ⊂ H∞.
If 1 < p <∞ and α = 1p then f (z) = log
(1
1−z
)∈ Λp
1/p.
Theorem (Bourdon, Shapiro, Sledd, 1989)
Λp1/p ⊂ Λq
1/q ⊂ BMOA ⊂ B, 1 ≤ p < q <∞.
Theorem (Girela, 1997)
If 1 < p <∞ and ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0 then
Λ(p, ω) 6⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
If 1 < p <∞ and α > 1p then Λp
α ⊂ A ⊂ H∞.
If 1 < p <∞ and α = 1p then f (z) = log
(1
1−z
)∈ Λp
1/p.
Theorem (Bourdon, Shapiro, Sledd, 1989)
Λp1/p ⊂ Λq
1/q ⊂ BMOA ⊂ B, 1 ≤ p < q <∞.
Theorem (Girela, 1997)
If 1 < p <∞ and ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0 then
Λ(p, ω) 6⊂ B.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
TheoremLet µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
X can be BMOA, Qs for s > 0 or Λp1/p for 2 ≤ p <∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
TheoremLet µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
X can be BMOA, Qs for s > 0 or Λp1/p for 2 ≤ p <∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
TheoremLet µ be a positive Borel measure on [0,1) and let X be aBanach space of analytic functions in D with Λ2
1/2 ⊂ X ⊂ B.Then the following conditions are equivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λ2
1/2.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
X can be BMOA, Qs for s > 0 or Λp1/p for 2 ≤ p <∞.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
LemmaLet f ∈ Hol(D) be of the form f (z) =
∑∞n=0 anzn with {an}∞n=0
being a decreasing sequence of nonnegative numbers.If X is a subspace of Hol(D) with
Λ21/2 ⊂ X ⊂ B,
then
f ∈ X ⇔ an = O(
1n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Lemma (M.)
Let f ∈ Hol(D) be of the form f (z) =∑∞
n=0 anzn with {an}∞n=0being a decreasing sequence of nonnegative numbers.If 1 < p <∞ and X is a subspace of Hol(D) with
Λp1/p ⊂ X ⊂ B
then
f ∈ X ⇔ an = O(
1n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)Suppose that 1 < p <∞. Let µ be a positive Borel measure on[0,1) and let X be a Banach space of analytic functions in Dwith Λp
1/p ⊂ X ⊂ B. Then the following conditions areequivalent.
(i) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into the Bloch space B.
(ii) The operator Hµ is well defined in X and, furthermore, it isa bounded operator from X into Λp
1/p.
(iii) The measure µ is a 1-logarithmic 1-Carleson measure.(iv)
∫[0,1) tn log 1
1−t dµ(t) = O(1
n
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Corollary
Let µ be a positive Borel measure on [0,1) and 1 < p <∞.Then the operator Hµ is well defined in Λp
1/p and, furthermore, itis a bounded operator from Λp
1/p into itself if and only if µ is a1-logarithmic 1-Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Corollary
Let µ be a positive Borel measure on [0,1) and 1 < p <∞.Then the operator Hµ is well defined in Λp
1/p and, furthermore, itis a bounded operator from Λp
1/p into itself if and only if µ is a1-logarithmic 1-Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Lemma (M.)
Let 1 < p <∞, ω ∈ AW and let f (z) =∑∞
n=0 anzn with {an}∞n=0being a decreasing sequence of nonnegative numbers. Then
f ∈ Λ(p, ω) ⇔ an = O(ω(1/n)
n1−1/p
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Lemma (M.)
Let 1 < p <∞, ω ∈ AW and let f (z) =∑∞
n=0 anzn with {an}∞n=0being a decreasing sequence of nonnegative numbers. Then
f ∈ Λ(p, ω) ⇔ an = O(ω(1/n)
n1−1/p
).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)
Let 1 < p <∞, ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0. Thefollowing conditions are equivalent:
(i) The operator Hµ is well defined in Λ(p, ω) and,furthermore, it is a bounded operator from Λ(p, ω) intoitself.
(ii) The measure µ is a Carleson measure.
Remark
Hµ : Λp1/p → Λp
1/p bounded ⇔ µ is a 1-log 1-Carlesonmeasure.Hµ : Λ(p, ω)→ Λ(p, ω) bounded ⇔ µ is a Carlesonmeasure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)
Let 1 < p <∞, ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0. Thefollowing conditions are equivalent:
(i) The operator Hµ is well defined in Λ(p, ω) and,furthermore, it is a bounded operator from Λ(p, ω) intoitself.
(ii) The measure µ is a Carleson measure.
Remark
Hµ : Λp1/p → Λp
1/p bounded ⇔ µ is a 1-log 1-Carlesonmeasure.Hµ : Λ(p, ω)→ Λ(p, ω) bounded ⇔ µ is a Carlesonmeasure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)
Let 1 < p <∞, ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0. Thefollowing conditions are equivalent:
(i) The operator Hµ is well defined in Λ(p, ω) and,furthermore, it is a bounded operator from Λ(p, ω) intoitself.
(ii) The measure µ is a Carleson measure.
Remark
Hµ : Λp1/p → Λp
1/p bounded ⇔ µ is a 1-log 1-Carlesonmeasure.Hµ : Λ(p, ω)→ Λ(p, ω) bounded ⇔ µ is a Carlesonmeasure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)
Let 1 < p <∞, ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0. Thefollowing conditions are equivalent:
(i) The operator Hµ is well defined in Λ(p, ω) and,furthermore, it is a bounded operator from Λ(p, ω) intoitself.
(ii) The measure µ is a Carleson measure.
Remark
Hµ : Λp1/p → Λp
1/p bounded ⇔ µ is a 1-log 1-Carlesonmeasure.Hµ : Λ(p, ω)→ Λ(p, ω) bounded ⇔ µ is a Carlesonmeasure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Theorem (M.)
Let 1 < p <∞, ω ∈ AW with ω(δ)
δ1/p ↗∞ when δ ↘ 0. Thefollowing conditions are equivalent:
(i) The operator Hµ is well defined in Λ(p, ω) and,furthermore, it is a bounded operator from Λ(p, ω) intoitself.
(ii) The measure µ is a Carleson measure.
Remark
Hµ : Λp1/p → Λp
1/p bounded ⇔ µ is a 1-log 1-Carlesonmeasure.Hµ : Λ(p, ω)→ Λ(p, ω) bounded ⇔ µ is a Carlesonmeasure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(i)⇒ (ii) Suppose that Hµ : Λ(p, ω)→ Λ(p, ω) is bounded. Bythe Lemma
f (z) =∞∑
n=1
ω(1/n)
n1−1/p zn, f ∈ Λ(p, ω), so Hµ(f ) ∈ Λ(p, ω).
Hµ(f )(z) =∞∑
n=0
( ∞∑k=1
ω(1/k)
k1−1/p µn+k
)zn.
Since∑∞
k=1ω(1/k)k1−1/p µn+k ↘ 0, using again the Lemma we can
prove that µ is a Carleson measure.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(ii)⇒ (i) Suppose that µ is a Carleson measure. Using thefollowing Lemma (Girela & González, 2000)
f ∈ Λ(p, ω)⇒ |f (z)| . ω(1− |z|)(1− |z|)1/p , z ∈ D.
We can prove that
f ∈ Λ(p, ω)⇒∫[0,1)
|f (t)||1− tz|
dµ(t) <∞.
So if f ∈ Λ(p, ω) then Iµ(f ) and Hµ(f ) are well defined and
Hµ(f )(z) = Iµ(f )(z), z ∈ D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(ii)⇒ (i) Suppose that µ is a Carleson measure. Using thefollowing Lemma (Girela & González, 2000)
f ∈ Λ(p, ω)⇒ |f (z)| . ω(1− |z|)(1− |z|)1/p , z ∈ D.
We can prove that
f ∈ Λ(p, ω)⇒∫[0,1)
|f (t)||1− tz|
dµ(t) <∞.
So if f ∈ Λ(p, ω) then Iµ(f ) and Hµ(f ) are well defined and
Hµ(f )(z) = Iµ(f )(z), z ∈ D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(ii)⇒ (i) Suppose that µ is a Carleson measure. Using thefollowing Lemma (Girela & González, 2000)
f ∈ Λ(p, ω)⇒ |f (z)| . ω(1− |z|)(1− |z|)1/p , z ∈ D.
We can prove that
f ∈ Λ(p, ω)⇒∫[0,1)
|f (t)||1− tz|
dµ(t) <∞.
So if f ∈ Λ(p, ω) then Iµ(f ) and Hµ(f ) are well defined and
Hµ(f )(z) = Iµ(f )(z), z ∈ D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
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Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(ii)⇒ (i) Suppose that µ is a Carleson measure. Using thefollowing Lemma (Girela & González, 2000)
f ∈ Λ(p, ω)⇒ |f (z)| . ω(1− |z|)(1− |z|)1/p , z ∈ D.
We can prove that
f ∈ Λ(p, ω)⇒∫[0,1)
|f (t)||1− tz|
dµ(t) <∞.
So if f ∈ Λ(p, ω) then Iµ(f ) and Hµ(f ) are well defined and
Hµ(f )(z) = Iµ(f )(z), z ∈ D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 113: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/113.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
Proof
(ii)⇒ (i) Suppose that µ is a Carleson measure. Using thefollowing Lemma (Girela & González, 2000)
f ∈ Λ(p, ω)⇒ |f (z)| . ω(1− |z|)(1− |z|)1/p , z ∈ D.
We can prove that
f ∈ Λ(p, ω)⇒∫[0,1)
|f (t)||1− tz|
dµ(t) <∞.
So if f ∈ Λ(p, ω) then Iµ(f ) and Hµ(f ) are well defined and
Hµ(f )(z) = Iµ(f )(z), z ∈ D.
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 114: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/114.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 115: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/115.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 116: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/116.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 117: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/117.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 118: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/118.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 119: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/119.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 120: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/120.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
ProofUsing again the Lemma, the Minkowski inequality and doingsome work we obtain that
Mp(r , Iµ(f )′
)=
(1
2π
∫ π
−π
∣∣∣∣∣∫[0,1)
tf (t)(1− treiθ)2 dµ(t)
∣∣∣∣∣p
dθ
)1/p
.∫[0,1)|f (t)|
(∫ π
−π
dθ|1− treiθ|2p
)1/p
dµ(t)
.∫[0,1)
|f (t)|(1− tr)2−1/p dµ(t)
.∫[0,1)
ω(1− t)(1− t)1/p(1− tr)2−1/p dµ(t)
.ω(1− r)
(1− r).
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces
![Page 121: A generalized Hilbert operator acting on mean Lipschitz spacesverso.mat.uam.es/~dragan.vukotic/respub/Beamer N. Merchan... · 2018-10-18 · Generalized Hilbert matrix Mean Lipschitz](https://reader035.vdocuments.us/reader035/viewer/2022070717/5edc9cf3ad6a402d66675a67/html5/thumbnails/121.jpg)
Notation and definitionsGeneralized Hilbert matrix
Mean Lipschitz spacesHµ acting on mean Lipschitz spaces
THANK YOU!
Noel Merchán [email protected] A generalized Hilbert operator acting on mean Lipschitz spaces