A sphere -positive curvature- [Une sphère -courbure positive-].




See an helix on a sphere:




See three related pictures regarding the extended arithmetic [l'arithmétique étendue]:




See some artistic views:

 



[See the equations of the sphere]


(CMAP28 WWW site: this page was created on 03/06/2013 and last updated on 01/23/2019 10:53:26 -CET-)



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Copyright (c) Jean-François Colonna, 2013-2019.
Copyright (c) CMAP (Centre de Mathématiques APpliquées) UMR CNRS 7641 / Ecole Polytechnique, 2013-2019.