OAI/Geometry/SurfaceImmersion/Whitney/SmoothCrosscapSourceArc.lean

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An actual smooth embedded source arc joining the two crosscaps. Its interior is regular, and every newly inserted point lies in a compact regular set, so the original endpoint geometry remains accessible.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.smooth_crosscap_source_arc line 18