## A variational analogue of Krasnoselskii’s cone fixed point theory

AbstractBased on Ekeland’s principle, a variational analogue of Krasnoselskii’s cone compression-expansion fixed point theorem is presented. A general scheme of…

AbstractBased on Ekeland’s principle, a variational analogue of Krasnoselskii’s cone compression-expansion fixed point theorem is presented. A general scheme of…

AbstractWe establish the existence of positive solutions for systems of second–order differential equations with discontinuous nonlinear terms. To this aim,…

Abstract We prove that the four-point boundary value problem \(-[\U{3d5} (u\prime)]\prime=f(t,u,u\prime),u(0)=\U{3b1} u(\U{3be}),u(T)=\U{3b2} u(\U{3b7} ),)\ where \(f:[0,T]\times R^{2}\rightarrow R)\ is continuous,…

Abstract In this paper, we study a class of neutral functional integrodifferential equations with finite delay in Banach spaces. We…

AbstractThis paper concerns the existence, localization and multiplicity of positive solutions for a φ-Laplacian problem with a perturbed term that…

AbstractThe localization of positive symmetric solutions to the Dirichlet problem for second-order ordinary differential equations involving a singular φ-Laplacian is…

AbstractWe establish existence, localization and multiplicity results of positive solutions for general operator systems in ordered Banach spaces. Our main…

AbstractIn this paper we study some properties of the solutions of a second order system of functional-differential equations with maxima,…

AbstractWe consider a probability distribution depending on a real parameter x. As functions of x, the Renyi entropy and the…

AbstractThe present note is devoted to a generalization of the notion of shift invariant operators that we call it λ-invariant…