OAI/Geometry/SurfaceImmersion/Whitney/CrosscapDerivativeNonzero.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

The derivative at an actual crosscap has rank at least one.

  1. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SurfaceCrosscapCoordinates.derivative_ne_zero line 14