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 01/04/2023 11:58:16 -CET-)



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