The aim of this work is two fold: first we extend some results concerning the computation of
the fixed point index for the sum of an expansive mapping and a $ k $-set contraction …

We study a class of initial value problems for impulsive nonlinear wave equations. A new
topological approach is applied to prove the existence of at least one and at least two …

As a very important part of nonlinear analysis, fixed point theory plays a key role in
solvability of many complex systems from mathematics applied to chemical reactors, neutron …

In this work, we are concerned with the existence of multiple positive fixed points for the sum
of an expansive mapping with constant h> 1 and ak‐set contraction when 0≤ k< h− 1. In …

This paper considers a class of fractional impulsive wave equations and improves a
previous results. In fact, this paper adopts a new topological approach to prove the existence …

We have obtained some new Krasoneslskii type fixed point theorems for the sum of two
operators T+ F, where T is expansive with constant h> 1 and IF is a k-set contraction with k< …

In this paper we investigate a class of boundary value problems for weighted p (t)-Laplacian
impulsive systems. We prove existence of at least one solution and existence of at least one …

In this paper, we study a class of fourth-order boundary value problems with integral
boundary conditions. The nonlinearity may have time-singularity and change sign …

In this work, we are interested in the existence of solutions for a class of first order boundary
value problems (BVPs for short). We give new sufficient conditions under which the …

In this paper, we investigate the existence of at least one solution and at least two
nonnegative solutions of impulsive differential equations with the two-point integral …