OAI/Geometry/SurfaceImmersion/Whitney/DoubleChartReparametrization.lean

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Actual double-locus chart changes admit global oriented smooth reparametrizations retaining both surface-sheet germs.

  1. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SmoothDoubleChart.oriented_reparametrization line 17