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Equivalence of the existence of best proximity points and best proximity pairs for cyclic and noncyclic nonexpansive mappings

机译:Equivalence of the existence of best proximity points and best proximity pairs for cyclic and noncyclic nonexpansive mappings

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摘要

In this study, at first we prove that the existence of best proximity points for cyclic nonexpansive mappings is equivalent to the existence of best proximity pairs for noncyclic nonexpansive mappings in the setting of strictly convex Banach spaces by using the projection operator. In this way, we conclude that the main result of the paper Proximal normal structure and nonexpansive mappings , Studia Math. 171 (2005), 283–293 immediately follows. We then discuss the convergence of best proximity pairs for noncyclic contractions by applying the convergence of iterative sequences for cyclic contractions and show that the convergence method of a recent paper Convergence of Picard's iteration using projection algorithm for noncyclic contractions , Indag. Math. 30 (2019), no. 1, 227–239 is obtained exactly from Picard’s iteration sequence.

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