Results 21 to 30 of about 4,770,398 (82)

Coupled coincidence point theorems for contractions without commutative condition in intuitionistic fuzzy normed spaces

open access: yes, 2011
Recently, Gordji et al. [Math. Comput. Model. 54, 1897-1906 (2011)] prove the coupled coincidence point theorems for nonlinear contraction mappings satisfying commutative condition in intuitionistic fuzzy normed spaces.
W. Sintunavarat, Y. Cho, Poom Kumam
semanticscholar   +1 more source

Common fixed points of set‐valued mappings

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 25, Issue 6, Page 411-415, 2001., 2001
The main purpose of this paper is to obtain a common fixed point for a pair of set‐valued mappings of Greguš type condition. Our theorem extend Diviccaro et al. (1987), Guay et al. (1982), and Negoescu (1989).
M. R. Singh, L. S. Singh, P. P. Murthy
wiley   +1 more source

Primary singularities of vector fields on surfaces [PDF]

open access: yes, 2020
Unless another thing is stated one works in the C∞ category and manifolds have empty boundary. Let X and Y be vector fields on a manifold M. We say that Y tracks X if [Y, X] = fX for some continuous function f: M→ R. A subset K of the zero set Z(X) is an
Hirsch, MW, Turiel, FJ
core   +1 more source

Coupled and tripled coincidence point results without compatibility

open access: yes, 2012
In this article, we introduce a new and simple approach to coupled and tripled coincidence point theory. By using our method, we establish coupled coincidence point results of Lakshmikantham and Ćirić, Binayak et al., Alotaibi and Alsulami without any ...
N. Hussain   +2 more
semanticscholar   +1 more source

Fixed points via a generalized local commutativity

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 25, Issue 8, Page 497-507, 2001., 2001
Let g : X → X. The concept of a semigroup of maps which is “nearly commutative at g” is introduced. We thereby obtain new fixed point theorems for functions with bounded orbit(s) which generalize a recent theorem by Huang and Hong, and results by Jachymski, Jungck, Ohta, and Nikaido, Rhoades and Watson, and others.
Gerald F. Jungck
wiley   +1 more source

Related fixed points for set valued mappings on two metric spaces

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 23, Issue 3, Page 205-210, 2000., 2000
Some related fixed points theorems for set valued mappings on two complete and compact metric spaces are proved.
Brian Fisher, Duran Türkoglu
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

Some results on maximal elements

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 23, Issue 6, Page 409-413, 2000., 2000
We prove some results on maximal elements using the KKM‐map principle.
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

A theorem of Meir‐Keeler type revisited

open access: yesInternational Journal of Mathematics and Mathematical Sciences, Volume 23, Issue 7, Page 507-511, 2000., 2000
In 1993, the authors presented a fixed point theorem of Meir‐Keeler type. The proposed proof of a lemma—on which the said theorem depends on—is invalid. In this note, we alter the statement of this lemma and give a valid proof thereof, so that the main result of the previous paper is still true.
Y. J. Cho, P. P. Murthy, G. Jungck
wiley   +1 more source

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