OAI/Analysis/CircleDomains/Sobolev/PrincipalLocalizedDerivativeError.lean

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A bounded multiplier tending almost everywhere to zero annihilates both the fixed and variable parts of the principal derivative on any finite-measure set. This is used for the reflection defect.

  1. lemma OAI.CircleDomainRigidity.PrincipalMapLimit.exists_localized_derivative_error line 14