OAI/Geometry/SurfaceImmersion/Whitney/ProjectionCrosscapJet.lean

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3 declarations, 0 contain sorry, 0 declared as axioms

The nondegenerate second-jet condition at a singularity of a regular three-dimensional projection. This concerns the original unweighted coordinate representative, not merely the weighted atlas derivative.

  1. def OAI.ClosedSurfaceR4.FiniteOrderSmoothing.projectedCrosscapJet line 14
  2. lemma OAI.ClosedSurfaceR4.FiniteOrderSmoothing.projectedCrosscapJet_apply line 19
  3. theorem OAI.ClosedSurfaceR4.FiniteOrderSmoothing.SmoothingAtlas.regular_projection_crosscap_jet line 31