OAI/Geometry/RCD/Sobolev/WeakLaplacianAffineChain.lean

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The weak C² chain rule with a nonzero derivative at zero

Subtract the affine part, apply the zero-derivative chain rule, and add back the corresponding multiple of the actual weak Laplacian.

  1. theorem OAI.RegularPointCoordinates.weakLaplacian_comp_C2_affine line 18