On a fixed point theorem of Greguš.
Fisher, Brian, Sessa, Salvatore (1986)
International Journal of Mathematics and Mathematical Sciences
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Fisher, Brian, Sessa, Salvatore (1986)
International Journal of Mathematics and Mathematical Sciences
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Ćirić, Ljubomir B. (1981)
Publications de l'Institut Mathématique. Nouvelle Série
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H. K. Pathak, Shin Min Kang, Yeol Je Cho (1998)
Czechoslovak Mathematical Journal
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In this paper we first prove some coincidence and fixed point theorems for nonlinear hybrid generalized contractions on metric spaces. Secondly, using the concept of an asymptotically regular sequence, we give some fixed point theorems for Kannan type multi-valued mappings on metric spaces. Our main results improve and extend several known results proved by other authors.
Ljubomir B. Ćirić (2000)
Czechoslovak Mathematical Journal
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Let be a closed convex subset of a complete convex metric space . In this paper a class of selfmappings on , which satisfy the nonexpansive type condition below, is introduced and investigated. The main result is that such mappings have a unique fixed point.
Kikkawa, Misako, Suzuki, Tomonari (2008)
Fixed Point Theory and Applications [electronic only]
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