Today I Learned

Some of the things I've learned every day since Oct 10, 2016

99: Non-Orientable Surfaces and the Möbius Strip

The Möbius strip is a canonical and minimal example of a non-orientable surface, in the sense that

  1. a surface is non-orientable if and only if it has the Möbius strip as a topological subspace, and
  2. the Möbius strip is the only surface with this property.
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