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Bożena Piątek (2008)
Annales UMCS, Mathematica
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In this work we present results on fixed points, pairs of coincidence points and best approximation for ε-semicontinuous mappings in metric trees. It is a generalization of the similar properties of upper and almost lower semicontinuous mappings.
Fernando Cobos (1988)
Colloquium Mathematicae
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Tulsi Dass Narang (1986)
Archivum Mathematicum
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Tulsi Dass Narang (1985)
Archivum Mathematicum
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J. Prasad (1972)
Publications de l'Institut Mathématique [Elektronische Ressource]
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Tiziana Cardinali (2002)
Discussiones Mathematicae, Differential Inclusions, Control and Optimization
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If f is a continuous seminorm, we prove two f-best approximation theorems for functions Φ not necessarily continuous as a consequence of our version of Glebov's fixed point theorem. Moreover, we obtain another fixed point theorem that improves a recent result of [4]. In the last section, we study continuity-type properties of set valued parametric projections and our results improve recent theorems due to Mabizela [11].
Jiři Močkoř (1975)
Colloquium Mathematicae
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P. L. Papini (1987)
Matematički Vesnik
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