Quantitative approximations by using scaling type functions
Abstract The focus of the paper is to study a class of linear positive operators constructed by using a quasi-scaling…
2005
Construction of upper and lower solutions with applications to singular boundary value problems
Abstract An upper and lower solution theory is presented for the Dirichlet boundary value problem \(y^{\prime\prime}+f(t,y,y^{\prime})=0\), \(0<t <1\) with \(y(0)=y(1)=0\).…
Existence and localization results for semi-linear problems
AbstractThis survey paper presents the new method worked out in [14] and [15] for the existence and localization of solutions…
Compression-expansion fixed point theorems in two norms
AbstractIn this paper we present compression-expansion fixed point theorems in cones where the compression and the expansion conditions are expressed…
Boundary value problems arising in the percolation of water from a cylindrical reservoir into the surrounding soil
Abstract Existence results are established for a general class of second-order boundary value problems motivated from a problem arising in…
Compression-expansion fixed point theorem in two norms and applications
Abstract In this paper we present a two-norms version of Krasnoselskii’s fixed point theorem in cones. The abstract result is…
Existence theory for nonlinear operator equations of Hammerstein type in Banach spaces
AbstractWe use topological methods to develop an existence theory for nonlinear operator equations of Hammerstein type in Banach spaces. In…
Positive solutions of evolution operator equations
AbstractExistence and localization results are derived from Krasnoselskii’s compressionexpansion fixed point theorem in cones, for operator equations in spaces of…
The energy-free equations of the 3D inverse problem of dynamics
Abstract[Mathjax] Given a two-parametric family of curves \(f\) \(x,y,z)-c_{1},g\left(x,y,z\right) =c_{2}\), we look for potentials Vunder whose action a particle of…
On a class of approximation operators
AbstractIn this note we construct a class of approximation operators using polynomial sequences of binomial type. We compute the expression…