DescriptionSphere wrapped round itself.png	Illustration for Homotopy groups of spheres
Date	19 October 2007 10:06(oringinal upload time)
Source	Tranfered from en:File:Sphere wrapped round itself.png by 刻意.
Author	Salix alba
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Illustration for Homotopy groups of spheres, π₂(S²)=Z. The equation is ${\displaystyle (rcos(\theta )cos(\phi ),rcos(\theta )sin(\phi ),sin(\theta ))}$, with ${\displaystyle r=1+a\phi }$.

Made with SingSurf and JavaView, post processed with gimp/inkscape.

Author: R Morris