Is it true that the atlas for a torus can consist of a single map while the atlas for a sphere requires at least two maps?(adsbygoogle = window.adsbygoogle || []).push({});

Can we ever get by with a single map for some Calabi–Yau manifolds assuming that question makes sense? If not is there some maximum number required?

Thanks for any help!

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# Atlas of torus and sphere. Atlas of Calabi–Yau manifold.

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