Yazar "Minak, Gulhan" için listeleme
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Ciric Type Generalized F-contractions on Complete Metric Spaces and Fixed Point Results
Minak, Gulhan; Helvaci, Asuman; Altun, Ishak (Univ Nis, Fac Sci Math, 2014)Recently, Wardowski [15] introduced the concept of F-contraction on complete metric space. This type contraction is proper generalization of ordinary contraction. In the present paper, we give some fixed point results for ... -
An extension of Assad-Kirk's fixed point theorem for multivalued nonself mappings
Altun, Ishak; Minak, Gulhan (North Univ Baia Mare, 2016)In the present paper, taking into account the recent developments on the theory of fixed point, we give some fixed point results for multivalued nonself mappings on complete metrically convex metric spaces. Our main result ... -
Fixed Point Results for α-ψ-Contractive Mappings Including Almost Contractions and Applications
Durmaz, Gonca; Minak, Gulhan; Altun, Ishak (Hindawi Publishing Corp, 2014)In the recent paper (B. Samet, C. Vetro, and P. Vetro, Fixed point theorems for alpha-psi-contractive type mappings, Nonlinear Analysis. Theory, Methods and Applications, 75 (2012), 2154-2165.), the authors introduced the ... -
Fixed points of F-contractive type fuzzy mappings
Minak, Gulhan; Altun, Ishak; Olgun, Murat (Ios Press, 2017)In this paper, taking into account the recent contractive technique, which was introduced by Wardowski [18], we present a fixed point theorem for F-contractive type fuzzy mappings over a complete metric space. -
Fixed points of multivalued nonlinear F-contractions on complete metric spaces
Altun, Ishak; Minak, Gulhan; Olgun, Murat (Inst Mathematics & Informatics, 2016)We introduce a new concept for multivalued maps, also called multivalued nonlinear F-contraction, and give a fixed point result. Our result is a proper generalization of some recent fixed point theorems including the famous ... -
Fixed points of ordered F-contractions
Durmaz, Gonca; Minak, Gulhan; Altun, Ishak (Hacettepe Univ, Fac Sci, 2016)In his recent paper, Wardowski [16] introduced the concept of F-contraction, which is a proper generalization of ordinary contraction on a complete metric space. Then, some generalizations of F-contractions including ... -
Multivalued Almost F-contractions on Complete Metric Spaces
Altun, Ishak; Durmaz, Gonca; Minak, Gulhan; Romaguera, Salvador (Univ Nis, Fac Sci Math, 2016)In the present paper, considering a new concept of multivalued almost F-contraction, we give a general class of multivalued weakly Picard operators on complete metric spaces. Also, we give some illustrative examples showing ... -
Multivalued F-Contractions On Complete Metric Spaces
Altun, Ishak; Minak, Gulhan; Dag, Hacer (Yokohama Publ, 2015)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 ... -
Multivalued Pseudo-Picard Operators and Fixed Point Results
Minak, Gulhan; Acar, Ozlem; Altun, Ishak (Hindawi Ltd, 2013)We introduce the concept of multivalued pseudo-Picard (MPP) operator on ametric space. This concept is weaker than multivalued weakly Picard (MWP) operator, which is given by M. Berinde and V. Berinde (2007). Then, we give ... -
A new approach to fixed point theorems for multivalued contractive maps
Minak, Gulhan; Olgun, Murat; Altun, Ishak (North Univ Baia Mare, 2015)In the present paper, considering the Wardowski's technique we give many fixed point results for multivalued maps on complete metric space without using the Hausdorff metric. Our results are real generalization of some ... -
A New Approach To Mizoguchi-Takahashi Type Fixed Point Theorems
Olgun, Murat; Minak, Gulhan; Altun, Ishak (Yokohama Publ, 2016)In the present paper, we give a generalization of Mizoguchi-Takahashi's fixed point theorem, which is a partial solution of Reich's original problem concerning multivalued mappings on complete metric spaces. -
A new approach to the Assad-Kirk fixed point theorem
Altun, Ishak; Olgun, Murat; Minak, Gulhan (Springer Basel Ag, 2016)In the present paper, considering the Wardowski's technique, we give a new approach to the Assad-Kirk fixed point theorem on metrically convex metric spaces. We also provide a nontrivial example showing that our result is ... -
On A Broad Category Of Multivalued Weakly Picard Operators
Hancer, Hatice Aslan; Minak, Gulhan; Altun, Ishak (House Book Science-Casa Cartii Stiinta, 2017)In the present paper, considering a recent technique which is used by Jleli and Samet [10] for fixed points of single-valued maps, we introduce a new concept of multivalued theta-contractions on metric spaces and prove ... -
On A New Class Of Multivalued Weakly Picard Operators On Complete Metric Spaces
Altun, Ishak; Olgun, Murat; Minak, Gulhan (Mathematical Soc Rep China, 2015)In the present paper, the concept of nonlinear F-contraction for multivalued mappings in metric spaces is introduced and considering the new proof technique, which was used for single valued maps by Wardowski [D. Wardowski, ... -
On the effect of alpha-admissibility and theta-contractivity to the existence of fixed points of multivalued mappings
Minak, Gulhan; Altun, Ishak (Inst Mathematics & Informatics, 2016)In this study, we give some fixed point results for multivalued mappings using alpha-admissibility and theta-contractivity of multivalued mappings on complete metric spaces. Our results are proper generalizations of some ... -
Ordered Theta-Contractions And Some Fixed Point Results
Minak, Gulhan; Altun, Ishak (Mathematical Research Press-Math Res, 2017)Recently, Jleli and Samet proved a fixed point result that is a proper generalization of the celebrated Banach contraction principle on complete metric spaces. By considering both theta-contractions and fixed point results ... -
Some new generalizations of Mizoguchi-Takahashi type fixed point theorem
Minak, Gulhan; Altun, Ishak (Springer International Publishing Ag, 2013)In the light of the paper of Hasanzade Asl et al. (Fixed Point Theory Appl. 2012: 212, 2012, doi:10.1186/1687-1812-2012-212), we obtain a fixed point theorem for multivalued mappings on a complete metric space. Our result ... -
A stationary point theorem for multivalued θ-contractions
Minak, Gulhan; Altun, Ishak (Mathematical Research Press-Math Res, 2016)This paper is mainly devoted to a positive answer, with a new aspect, of the problem considered by Hanc, er et al. in [11] concerning multivalued version of theta - contraction which have been recently introduced by Jleli ...