OAI/Geometry/SurfaceImmersion/Whitney/CrosscapPairCoordinates.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

The two branches of a double point near an actual prepared crosscap are exactly the two opposite nonzero kernel-axis coordinates.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SurfaceCrosscapCoordinates.double_pair line 17