OAI/Geometry/SurfaceImmersion/Whitney/CrosscapRegularLocus.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

A genuine crosscap chart contains exactly one nonimmersed point.

  1. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SurfaceCrosscapCoordinates.regular_iff line 14