On a fixed point theorem of Gregus, Jr.

Abstract: A constructive proof of a fixed point theorem of M. GREGUS, Jr. is given. A simple example is presented to show that the theorem is not a consequence of the well-known Banach fixed point theorem.

Classification (MSC2000): 47H10

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• DOI: 10.5486/pmd.1991.39.3-4.09