2015 11 05 seminar_principiul contractiei
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(simetria) ("pozitivitatea")
(la 1) si la 2) este distanta euclidiana)
(i.e., f admite punct fix)
(inegalitatea triunghiului)
<== sirul aproximatiilor succesive
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k<1 este esential! Deci f nu admite punct fix.Exemplu de functie cu k=1, care nuadmite punct fix.
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