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Remarks on a generalization of Banach’s principle of contraction mappings. (English) Zbl 0129.38301

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topology
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[1] Banach, S, Sur LES opérations dans LES ensembles abstraits et leur application aux équations intégrales (thése présentée en juin 1920 a l’université de Léopol [= lwów] pour obtenir le grade de docteur en philosophie), Fundamenta math., 3, 133-181, (1922)
[2] Kolmogorov, A.N; Fomin, S.V, Elements of the theory of functions and functional analysis volume I, metric and normed spaces, (1957), Graylock Press Rochester, New York
[3] Dunford, N; Schwartz, J.T, Linear operators, part I, general theory, (1958), Interscience New York
[4] Hamel, G, Eine basis aller zahlen und die unstetige Lösungen der funktionalgleichung f(x + y) = f(x) + f(y), Math. ann., 60, 459-462, (1905) · JFM 36.0446.04
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