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On the stability of the index of unbounded linear transformations. (English. Russian summary) Zbl 0047.35901


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[1] М. Г. Крейн-М. А. Красносельский Усчйчиуость индекса неограниченного оператора Матем. сборник30, (72) (1952), pp. 219–224. · Zbl 0048.03104
[2] Ф. В. Аткинсн, Нормальная разрешимость линейних уравнений в нормированньIх пространствах, Матем. сбоник,28 (70) (1951), pp. 3–14. · Zbl 1154.68045
[3] See for instanceF. Riesz-B. Sz,-Nagy,Leçons d’Analyse fonctionnelle (Budapest, 1952), pp. 176–185, 214–216.
[4] To be exact, he has considered only the case whenE’=E, but, as one easily checks, his proofs run also whenE’.
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