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On nonlinear contractions. (English) Zbl 0175.44903


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[1] Leonard M. Blumenthal, Theory and applications of distance geometry, Oxford, at the Clarendon Press, 1953. · Zbl 0050.38502
[2] Einar Hille and Ralph S. Phillips, Functional analysis and semi-groups, American Mathematical Society Colloquium Publications, vol. 31, American Mathematical Society, Providence, R. I., 1957. rev. ed. · Zbl 0078.10004
[3] E. Rakotch, A note on contractive mappings, Proc. Amer. Math. Soc. 13 (1962), 459 – 465. · Zbl 0105.35202
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