OAI/Geometry/SurfaceImmersion/Whitney/RulingDirectionJet.lean

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3 declarations, 0 contain sorry, 0 declared as axioms

Transverse ruling preserves the full derivative-direction jet along its axis, including the mixed second derivative at each crosscap.

  1. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.transverseRuling_vertical line 15
  2. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.transverseRuling_second_vertical line 22
  3. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.transverseRuling_direction_jet line 64