Results 161 to 170 of about 979,219 (176)

A Fixed Point Theorem of Leggett–Williams Type with Applications to Single- and Multivalued Equations

Georgian Mathematical Journal, 2001
Abstract We establish a general fixed point theorem for multivalued maps defined on cones in Banach spaces. Applications to single and multivalued equations are presented.
Donal O'Regan, Ravi Agarwal
exaly   +2 more sources

Triple solutions for a nonlocal functional boundary value problem by leggett–williams theorem

Applicable Analysis, 2004
The existence of triple solutions for a second-order nonlocal functional boundary value problem is proved by using a fixed-point theorem on cones in Banach spaces due to Leggett and Williams. The obtained results are new even in the ordinary case for three-point boundary value problems discussed quite recently in [Xiaoming He and Weigao Ge (2002 ...
P Ch Tsamatos
exaly   +2 more sources

A multiplicity result for second order impulsive differential equations via the Leggett Williams fixed point theorem

Applied Mathematics and Computation, 2005
The authors consider the following boundary value problem for an impulsive differential equation of second order \[ \begin{gathered} y''(t)+ \varphi(t)f(y(t))= 0,\quad t\in (0,1)\setminus\{t_1,\dots, t_m\},\quad 0 ...
Donal O'Regan, Ravi Agarwal
exaly   +3 more sources

A generalization of the Leggett-Williams fixed point theorem and its application

Journal of Applied Mathematics and Computing, 2012
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jian-Ping Sun, Hai-E Zhang
exaly   +3 more sources

A generalization of the Petryshyn–Leggett–Williams fixed point theorem with applications to integral inclusions

Applied Mathematics and Computation, 2001
The authors extend the results of \textit{R. W. Leggett} and \textit{I. R. Williams} [Indiana Univ. Math. J. 28, 673--688 (1979; Zbl 0421.47033)] and \textit{W. V. Petryshyn} [J. Math. Anal. Appl. 124, 237--253 (1987; Zbl 0631.47044)] about the existence of at least three fixed points, to multivalued maps which satisfy an axiomatic index theory.
Donal O'Regan, Ravi Agarwal
exaly   +4 more sources

Leggett-Garg Inequalities for Quantum Fluctuating Work [PDF]

Entropy, 2018
The Leggett-Garg inequalities serve to test whether or not quantum correlations in time can be explained within a classical macrorealistic framework. We apply this test to thermodynamics and derive a set of LeggettGarg inequalities for the statistics of ...
Harry J D Miller, Janet Anders
exaly   +7 more sources

Expansion-compression fixed point theorem of Leggett-Williams type for the sum of two operators and applications for some classes of BVPs

Studia Universitatis Babes-Bolyai Matematica, 2023
"The purpose of this work is to establish an extension of a Leggett- Williams type expansion-compression fixed point theorem for a sum of two operators. As illustration, our approach is applied to prove the existence of non trivial nonnegative solutions for two-point BVPs and three-point BVPs."
Benslimane, Salim, Georgiev, Svetlin G., Mebarki, Karima   +2 more
openaire   +1 more source

Fractional Singular Coupled System: Existence Theory via Extended Leggett-Williams Theorem

Al-imad Journal of Humanities and Applied Sciences
In this paper, a very detailed existence theory is proposed for a coupled system of fractional differential equations with two competing cubic-root singularities. The system has two opposite nonlinear terms x^(-1/3) (repulsive) and x^(1/3) (restorative).
Entesar M. Nasr, Amna M. Nasr, Hend M. Elgadi, Amira A. Hashem, Ambark A. Ashat   +4 more
openaire   +1 more source

Leggett–Garg-like Inequalities from a Correlation Matrix Construction

Quantum Reports, 2023
Eliahu Cohen, Dana Ben Porath
exaly  

Leggett, William (1801-1839), journalist

2000
openaire   +1 more source