OAI/Geometry/SurfaceImmersion/Whitney/NondegenerateCrosscapDefect.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

The actual pair has exactly two nondegenerate normal-defect zeros in a single rectangular coordinate neighborhood.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.CrosscapCoordinateStrip.nondegenerate_normal_defect line 17