OAI/Geometry/SurfaceImmersion/Atlas/PhaseMetricPositive.lean

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1 declarations, 0 contain sorry, 0 declared as axioms

Positivity of the prescribed metric survives the actual inverse phase chart. In particular its curvature denominator is nonzero on the active chart locus.

  1. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SmoothingAtlas.phaseMetricRead_positive line 20