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A fixed-point theorem for inward and outward maps. (English) Zbl 0153.45602

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[1] Nelson Dunford and Jacob T. Schwartz, Linear operators, Part I, Interscience, New York, 1964. · Zbl 0084.10402
[2] A. Tychonoff, Ein Fixpunktsatz, Math. Ann. 111 (1935), no. 1, 767 – 776 (German). · Zbl 0012.30803
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