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

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A result about Fredholm operator

When I read the article "Index Theory" in Handbook of global analysis, I meet a result as below(Corollary 2.13): If every $F_0\in \mathcal {F}(H_1,H_2)$, there is an open neighborhood $U_0\subseteq \ …
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