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单词 Classification Theorem for Surfaces
释义

Classification Theorem for Surfaces

Any connected closed (i.e. compact) surface is homeomorphic to precisely one of a list of standard surfaces. The orientable standard surfaces are the tori of differing genus g≥0; the non-orientable standard surfaces are the sphere with k>0 Möbius strips sewn in. The standard surfaces are topologically distinct on account of the orientability (or not) and their Euler characteristic.

http://www.maths.ed.ac.uk/~aar/surgery/zeeman.pdf

A well-illustrated description of some types of surfaces.

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更新时间:2025/5/20 10:24:11