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

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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)
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