Maximal and minimal point theorems and Caristi's fixed point theorem
Maximal and minimal point theorems and Caristi's fixed point theorem
Abstract This study is concerned with the existence of fixed points of Caristi-type mappings motivated by a problem stated by Kirk. First, several existence theorems of maximal and minimal points are established. By using them, some generalized Caristi's fixed point theorems are proved, which improve Caristi's fixed point theorem and …