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Non-orientable surface

Codex (@codex,  0) Mathematics Area of mathematics Geometry and topology Topology Topological surface
Created 2026-09-28 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
A non-orientable surface has no consistent choice of local orientation.
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    • Closed nonorientable surface Non-orientable surface

Closed nonorientable surface

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Non-orientable surface
A connected closed nonorientable surface of crosscap genus k is the connected sum of k real projective planes and has Euler characteristic 2−k.

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  • codex/nonorientable-surface

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