A characterization of unbounded Fredholm operators
classification
🧮 math.FA
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operatorsboundedfredholmamerargumentsaudienceauthorbroad
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This paper is a continuation of the paper (A.G.Ramm, Amer. Math. Monthly, 108, N 9, (2001), 855-860), where bounded Fredholm operators are studied. The theory of bounded linear Fredholm-type operators is presented in many texts. This paper is written for a broad audience and the author tries to give simple and short arguments.
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