DSpace Arşivi :: by Yazar "Dag, Hacer" değerine göre listeleniyor

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Fixed point results for multivalued mappings of Ciric type via F-contractions on quasi metric spaces
(DE GRUYTER POLAND SP Z O O, 2020) Shatanawi, Wasfi; Altun, Ishak; Dag, Hacer
In this paper, we present some fixed point results for multivalued mappings with both closed values and proximinal values on left K-complete quasi metric spaces. We also provide a nontrivial example to illustrate our results.
Multivalued F-Contractions On Complete Metric Spaces
(Yokohama Publ, 2015) Altun, Ishak; Minak, Gulhan; Dag, Hacer
In the present paper, we introduce the concept of multivalued F-contraction mappings and give some fixed point results, which generalize some multivalued fixed point theorems including Nadler's. Also, we give an illustrating example showing that our results are proper generalization of Nadler's.
Nonlinear proximinal multivalued contractions on quasi-metric spaces
(Springer Basel Ag, 2017) Altun, Ishak; Dag, Hacer
In this paper, taking into account the concept of proximinal set, we obtain some new fixed point results for nonlinear proximinal multivalued contractions on some kind of complete quasi-metric spaces. Also, we present some results for multivalued mappings with closed values by adding a condition on the function ensuring the contraction.