div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: · tion is a regular compact surface homeomorphic to $2 We take in the space a rectangular Cartesian coordinate system Oxyz and we choose the z-axis to be the axis of rotation of src=https:reader033vdocumentsusreader033viewer20220422155ebc1d40283b6136fd03d63ahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: · tion is a regular compact surface homeomorphic to $2 We take in the space a rectangular Cartesian coordinate system Oxyz and we choose the z-axis to be the axis of rotation of src=https:reader033vdocumentsusreader033viewer20220422155ebc1d40283b6136fd03d63ahtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: · tion is a regular compact surface homeomorphic to $2 We take in the space a rectangular Cartesian coordinate system Oxyz and we choose the z-axis to be the axis of rotation of src=https:reader033vdocumentsusreader033viewer20220422155ebc1d40283b6136fd03d63ahtml5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: · tion is a regular compact surface homeomorphic to $2 We take in the space a rectangular Cartesian coordinate system Oxyz and we choose the z-axis to be the axis of rotation of src=https:reader033vdocumentsusreader033viewer20220422155ebc1d40283b6136fd03d63ahtml5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdiv