OAI/Analysis/CircleDomains/Reflection/PrincipalBeltramiResidual.lean

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The actual smooth principal approximants solve the limiting Beltrami equation up to a strong L2 error. This retains the residual needed when precomposing with a smooth comparison map.

  1. lemma OAI.CircleDomainRigidity.PrincipalSmoothApproximation.exists_strong_beltrami_residual line 14