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Common fixed points of four mappings. (English) Zbl 0936.54043

Summary: The aim of this paper is to obtain a common fixed point theorem by using a minimal commutativity condition and a new type of continuity condition and to establish a situation in which a collection of maps has a fixed point which is a point of discontinuity.

MSC:

54H25 Fixed-point and coincidence theorems (topological aspects)
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