Caristi-Kirk and Oettli-Thera ball spaces and applications

Blaszkiewicz, P; Cmiel, H; Linzi, A; Szewczyk, P

Blaszkiewicz, P (reprint author), Univ Szczecin, Inst Math, Ul Wielkopolska 15, PL-70451 Szczecin, Poland.

JOURNAL OF FIXED POINT THEORY AND APPLICATIONS, 2019; 21 (4):

Abstract

Based on the theory of ball spaces introduced by Kuhlmann and Kuhlmann, we introduce and study Caristi-Kirk and Oettli-Thera ball spaces. We show that......

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