OAI/Geometry/SurfaceImmersion/Whitney/SimplePreparedCrosscaps.lean

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A prepared finite-crosscap map with global self-transversality and no additional preimage of any singular point image, preserving every quadratic germ.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.exists_simple_prepared_crosscap_map line 17