OAI/Geometry/SurfaceImmersion/Whitney/FiniteQuadraticCrosscaps.lean

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The generic finite singular set can be prepared simultaneously: every singularity is represented by its genuine second Taylor polynomial, and no additional singularity is introduced anywhere on the surface.

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