OAI/Geometry/SurfaceImmersion/Primitive/PureRadialCrossing.lean

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2 declarations, 0 contain sorry, 0 declared as axioms

At a prepared point, a pure radial second form gives the strict ordered crossing inequality even for proportional nonzero tangent directions.

  1. lemma OAI.ClosedSurfaceR4.VelocityFrame.normalize_positive_smul line 12
  2. lemma OAI.ClosedSurfaceR4.VelocityFrame.orderedCrossing_pure_radial line 19