OAI/Geometry/SurfaceImmersion/Whitney/TransversePreparedCrosscaps.lean

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The previously constructed finite-crosscap map can be made globally self-transverse away from its diagonal, preserving every quadratic germ.

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