Yazar "Romaguera, Salvador" için listeleme
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Caristi's Type Mappings On Complete Partial Metric Spaces
Acar, Ozlem; Altun, Ishak; Romaguera, Salvador (House Book Science-Casa Cartii Stiinta, 2013)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 ... -
Characterizations of partial metric completeness in terms of weakly contractive mappings having fixed point
Altun, Ishak; Romaguera, Salvador (Univ Belgrade, Fac Electrical Engineering, 2012)We characterize both complete and 0-complete partial metric spaces in terms of weakly contractive mappings having a fixed point. Our results extend a well-known characterization of metric completeness due to SUZUKI and ... -
Common fixed points of Ciric-type contractions on partial metric spaces
Abbas, Mujahid; Altun, İshak; Romaguera, Salvador (Kossuth Lajos Tudomanyegyetem, 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 ... -
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 ... -
Recent developments about multivalued weakly Picard operators
Minak, Guelhan; Altun, Ishak; Romaguera, Salvador (Belgian Mathematical Soc Triomphe, 2015)In the present paper, considering a recent technique, which is used by Wardowski [24] for fixed points of single-valued mappings, we give a new and general class of multivalued weakly Picard operators on complete metric ...