OAI/Geometry/SurfaceImmersion/Whitney/QuadraticCrosscapNormalForm.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

Actual smooth target coordinates identifying a prepared quadratic jet with the standard Whitney umbrella.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.quadratic_crosscap_normal_form line 16