OAI/Geometry/SurfaceImmersion/Whitney/CrosscapJetStability.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

A nondegenerate crosscap direction remains the only zero in a fixed neighborhood after a sufficiently small second-jet change fixing its first jet.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.crosscap_jet_stability line 13