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Listar por autor "Altun, Ishak"

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Listar por autor "Altun, Ishak"

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    Caristi's type mappings on complete partial metric spaces 
    ACAR, ÖZLEM; Altun, Ishak; Romaguera Bonilla, Salvador ("Babeş-Bolyai" University of Cluj-Napoca, 2013)
    [EN] We introduce a new type of Caristi's mapping on partial metric spaces and show that a partial metric space is complete if and only if every Caristi mapping has a fixed point. From this result we deduce a characterization ...
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    Characterizations of partial metric completeness in terms of weakly contractive mappings having fixed point 
    Altun, Ishak; Romaguera Bonilla, Salvador (University of Belgrade and Academic Mind, 2012)
    We characterize both complete and 0-complete partial metri c spaces in terms of weakly contractive mappings having a fixed point. Our resu lts extend a well-known characterization of metric completeness due ...
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    Common fixed points of Ciric-type contractions on partial metric spaces 
    Abbas, Mujahid; Altun, Ishak; Romaguera Bonilla, Salvador (Debreceni Egyetem, Matematika Intézet, 2013)
    We obtain a common fixed point theorem of Boyd-Wong type for four mappings satisfying a Ciric-type contraction on a complete partial metric space. Our result generalizes and unifies, among others, the very recent results ...
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    Multivalued Almost F-contractions on Complete Metric Spaces 
    Altun, Ishak; Durmaz, Gonca; Minak, Gülhan; Romaguera Bonilla, Salvador (University of Nis, 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 ...
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    Weak partial metric spaces and some fixed point results 
    Altun, Ishak; Durmaz, Gonca (Universitat Politècnica de València, 2012-10-01)
    [EN] The concept of partial metric p on a nonempty set X was introduced by Matthews. One of the most interesting properties of a partial metric is that p(x, x) may not be zero for x e X. Also, each partial metric p on a ...