Results 31 to 40 of about 2,648,949 (108)

The best approximation and an extension of a fixed point theorem of F. E. Browder

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 18, Issue 4, Page 745-748, 1995., 1994
In this paper, the KKM principle has been used to obtain a theorem on the best approximation of a continuous function with respect to an affine map. The main result provides extensions of some well‐known fixed point theorems.
V. M. Sehgal, S. P. Singh
wiley   +1 more source

Topological Transversality Principles and General Coincidence Theory

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2017
This paper presents general topological coincidence principles for multivalued maps defined on subsets of completely regular topological spaces.
O’Regan Donal
doaj   +1 more source

Dynamics and Ulam Stability for Fractional q-Difference Inclusions via Picard Operators Theory

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2021
In this manuscript, by using weakly Picard operators we investigate the Ulam type stability of fractional q-difference An illustrative example is given in the last section.
Abbas Saïd   +2 more
doaj   +1 more source

Some results on invariant approximation

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 17, Issue 3, Page 483-487, 1994., 1993
In this paper results on Invariant approximations, extending and unifying earlier results are given. Several interesting results are derived as corollaries.
Antonio Carbone
wiley   +1 more source

Abstract Leray–Schauder Type Alternatives and Extensions

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
We present a Leray–Schauder type alternative for a general class of maps. This enables us to obtain some Birkhoff–Kellogg type results and a Furi–Pera result.
O’Regan Donal
doaj   +1 more source

On the hyperstability of a Cauchy-Jensen type functional equation in Banach spaces

open access: yes, 2015
4, pp. 359-375, December 2015.Universidad Cat´olica del NorteAntofagasta - ChileAbstractIn this paper, we establish some hyperstability results of the fol-lowing Cauchy-Jensen functional equationf(x+y2+z)+f(x−y2+z)=f(x)+2f(z)in Banach spaces.Subjclass ...
Iz-iddine El-Fassi, S. Kabbaj
semanticscholar   +1 more source

Non‐compact random generalized games and random quasi‐variational inequalities

open access: yesInternational Journal of Stochastic Analysis, Volume 7, Issue 4, Page 467-486, 1994., 1994
In this paper, existence theorems of random maximal elements, random equilibria for the random one‐person game and random generalized game with a countable number of players are given as applications of random fixed point theorems. By employing existence theorems of random generalized games, we deduce the existence of solutions for non‐compact random ...
Xian-Zhi Yuan
wiley   +1 more source

Leray–Schauder Alternatives for Maps Satisfying Countable Compactness Conditions

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2019
In this paper we present Leray–Schauder alternatives for a general class of Mönch type maps.
O’Regan Donal
doaj   +1 more source

Generalized functional inequalities in Banach spaces

open access: yesMoroccan Journal of Pure and Applied Analysis, 2021
In this paper, we solve and investigate the generalized additive functional inequalities ‖F(∑i=1nxi)-∑i=1nF(xi)‖≤‖F(1n∑i=1nxi)-1n∑i=1nF(xi)‖\left\| {F\left( {\sum\limits_{i = 1}^n {{x_i}} } \right) - \sum\limits_{i = 1}^n {F\left( {{x_i}} \right ...
Dimou H., Aribou Y., Kabbaj S.
doaj   +1 more source

A new class of unsaturated mappings: Ćirić-Reich-Rus contractions

open access: yesAnalele Stiintifice ale Universitatii Ovidius Constanta: Seria Matematica, 2022
Using the technique of enriching contractive type mappings, we introduce a more general concept of enriched Ćirić-Reich-Rus contraction than the one studied in [Berinde, V.; Păcurar, M.
Berinde Vasile, Păcurar Mădălina
doaj   +1 more source

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