Browsing by Author "Altun, İshak"

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Almost picard operators

Altun, İshak; Aslan Hacer, Hatice (Maltepe Üniversitesi, 2019)

The concept of Picard operator is one of the most important concept of fixed point theory. As known, a self mapping T of a metric space X is called Picard operator (PO) if it has unique fixed point and every Picard ...
Fixed point results with θ-function on quasi metric space

Durmaz Güngör, Gonca; Altun, İshak (Maltepe Üniversitesi, 2019)

In this presentation by considering the θ function which is a recent technique for contractions on metric space, we introduce a new type contraction on quasi metric space. Then, we give some fixed point results for α-admissible ...
Some generalizations of caristi type fixed point theorem on M-metric spaces

Şahin, Hakan; Altun, İshak; Türkoğlu, Duran (Maltepe Üniversitesi, 2019)

The Caristi fixed point theorem attracted the attention of many researcher. In this paper we investigate the Caristi fixed point theorem on M-metric spaces. First, we show that Caristi’s fixed point theorem doesn’t fully ...