OAI/Geometry/SurfaceImmersion/Whitney/StandardPreparedCrosscaps.lean

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2 declarations, 0 contain sorry, 0 declared as axioms

The unconditional generic map has actual standard crosscap charts, with globally isolated singular values and transverse regular sheets.

  1. structure OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SurfaceCrosscapCoordinates line 16
  2. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.exists_standard_prepared_crosscap_map line 30