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Banach spaces, function spaces, real functions, integral transforms, theory of distributions, measure theory.

2 votes

General version of Weyl's lemma

The result is true for elliptic PDE with smooth coefficients of any order! Theorem. Let $a_\alpha:\Omega \to \mathbb{R}$ be smooth functions on $\Omega \subset \mathbb{R}^n$ and suppose that the diffe …
MorseFunction-'s user avatar