Some of the things I've learned every day since Oct 10, 2016
99: Non-Orientable Surfaces and the Möbius Strip
January 23, 2017Posted by on
The Möbius strip is a canonical and minimal example of a non-orientable surface, in the sense that
- a surface is non-orientable if and only if it has the Möbius strip as a topological subspace, and
- the Möbius strip is the only surface with this property.