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Now showing 1 - 10 of 214
  • Article
    Citation - WoS: 15
    Contractive Multivalued Maps in Terms of q-functions on Complete Quasimetric Spaces
    (Springer international Publishing Ag, 2014) Karapinar, Erdal; Romaguera, Salvador; Tirado, Pedro
    In this paper we prove the existence of a fixed point for multivalued maps satisfying a contraction condition in terms of Q-functions, and via Bianchini-Grandolfi gauge functions, for complete T-0-quasipseudometric spaces. Our results extend, improve, and generalize some recent results in the literature. We present some examples to validate and illustrate our results.
  • Article
    Citation - WoS: 15
    Fixed Point Results for Various Α-Admissible Contractive Mappings on Metric-Like Spaces
    (Hindawi Ltd, 2014) Al-Mezel, Saleh A.; Chen, Chi-Ming; Karapinar, Erdal; Rakocevic, Vladimir
    We establish some fixed point theorems for alpha-admissible mappings in the context of metric-like space via various auxiliary functions. In particular, we prove the existence of a fixed point of the generalized Meir-Keeler type alpha-phi-contractive self-mapping.. defined on a metric- like space X. The given results generalize, improve, and unify several fixed point theorems for the generalized cyclic contractive mappings that have appeared recently in the literature.
  • Article
    Citation - WoS: 172
    Citation - Scopus: 190
    Interpolative Reich-Rus Type Contractions on Partial Metric Spaces
    (Mdpi, 2018) Karapinar, Erdal; Agarwal, Ravi; Aydi, Hassen
    By giving a counter-example, we point out a gap in the paper by Karapinar (Adv. Theory Nonlinear Anal. Its Appl. 2018, 2, 85-87) where the given fixed point may be not unique and we present the corrected version. We also state the celebrated fixed point theorem of Reich-Rus-Ciric in the framework of complete partial metric spaces, by taking the interpolation theory into account. Some examples are provided where the main result in papers by Reich (Can. Math. Bull. 1971, 14, 121-124; Boll. Unione Mat. Ital. 1972, 4, 26-42 and Boll. Unione Mat. Ital. 1971, 4, 1-11.) is not applicable.
  • Article
    Citation - WoS: 13
    Citation - Scopus: 19
    A Note on Caristi-Type Cyclic Maps: Related Results and Applications
    (Springer international Publishing Ag, 2013) Du, Wei-Shih; Karapinar, Erdal
    In this note, we first introduce the concept of Caristi-type cyclic map and present a new convergence theorem and a best proximity point theorem for Caristi-type cyclic maps. It should be mentioned that in our results, the dominated functions need not possess the lower semicontinuity property. Some best proximity point results and convergence theorems in the literature have been derived from our main results. Consequently, the presented results improve, extend and generalize some of the existence results on the topic.
  • Article
    Citation - WoS: 31
    Citation - Scopus: 36
    New Meir-Keeler Type Tripled Fixed-Point Theorems on Ordered Partial Metric Spaces
    (Hindawi Ltd, 2012) Aydi, Hassen; Karapinar, Erdal
    In this paper, we prove some new Meir-Keeler type tripled fixed-point theorems on a partially ordered complete partial metric space. Also, as application, some results of integral type are given.
  • Article
    Citation - WoS: 35
    Citation - Scopus: 46
    Some unique fixed point theorems for rational contractions in partially ordered metric spaces
    (Springeropen, 2013) Arshad, Muhammad; Karapinar, Erdal; Ahmad, Jamshaid
    In this paper, we prove some unique fixed point results for an operator T satisfying certain rational contraction condition in a partially ordered metric space. Our results generalize the main result of Jaggi (Indian J. Pure Appl. Math. 8(2):223-230, 1977). We give several examples to show that our results are proper generalization of the existing one. MSC: 47H10, 54H25, 46J10, 46J15.
  • Article
    Citation - WoS: 51
    Citation - Scopus: 57
    Tripled Coincidence Point Results for Generalized Contractions in Ordered Generalized Metric Spaces
    (Springer international Publishing Ag, 2012) Aydi, Hassen; Karapinar, Erdal; Shatanawi, Wasfi
    In this paper, we establish some tripled coincidence point results for a mixed g-monotone mapping F : X (3) -> X satisfying (psi, I center dot)-contractions in ordered generalized metric spaces. Also, an application and some examples are given to support our results.
  • Article
    Citation - WoS: 25
    Citation - Scopus: 25
    On the Extended Multivalued Geraghty Type Contractions
    (int Scientific Research Publications, 2016) Afshari, Hojjat; Alsulami, Hamed H.; Karapinar, Erdal
    In this paper we present some absolute retract results for modified Geraghty multivalued type contractions in b-metric space. Our results, generalize several existing results in the corresponding literature. We also present some examples to support the obtained results. (C) 2016 all rights reserved.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 6
    Some Results on S-contractions of Type e
    (Mdpi, 2018) Fulga, Andreea; Karapinar, Erdal
    In this manuscript, we consider the compositions of simulation functions and E-contraction in the setting of a complete metric space. We investigate the existence and uniqueness of a fixed point for this composite form. We give some illustrative examples and provide an application.
  • Article
    Citation - WoS: 5
    Citation - Scopus: 5
    A Solution for the Non-Cooperative Equilibrium Problem of Two Person Via Fixed Point Theory
    (Springeropen, 2015) Tran Duc Thanh; Hobiny, Aatef; Karapinar, Erdal
    In this paper, we investigate the non-cooperative equilibrium problem of two person games in the setting of game theory and propose a solution via coupled fixed point results in the context of partial metric spaces. We also realize that our coupled fixed point results can be applied to get a solution of a class of nonlinear Fredholm type integral equations.