OAI/Geometry/SurfaceImmersion/Whitney/RegularHomotopyCollar.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

A compact homotopy of transverse boundary vectors gives an actual smooth regular collar agreeing with its two endpoint ruled collars.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.regular_homotopy_collar line 15