We consider certain classes of Fejer monotone sequences and their basic properties. These properties are the starting point of a convergence theory for corresponding iterative methods which are widely used to solve convex problems.

This paper deals with the existence of L-quasi-solutions for impulsive periodic boundary value problems in an ordered Banach space E. Under a new concept of upper and lower solutions, a new monotone iterative technique on periodic boundary value problems of impulsive differential equations has been established. Our result improves and extends some relevant results in abstract differential equat...

where f ∈ C(J ×R×R,R) and α∈ C(J , J) (e.g., αmay be defined by α(t)=√t, T ≥ 1 or α(t)= 0.7t, t ∈ J). Moreover, r and γ are fixed real numbers. Differential equations with deviated arguments arise in a variety of areas of biological, physical, and engineering applications, see, for example, [9, Chapter 2]. The monotone iterative method is useful to obtain approximate solutions of nonlinear diff...

We investigate the initial value problem for a class of fractional evolution equations in a Banach space. Under some monotone conditions and noncompactness measure conditions of the nonlinearity, the well-known monotone iterative technique is then extended for fractional evolution equations which provides computable monotone sequences that converge to the extremal solutions in a sector generate...

*Correspondence: [email protected] 1Department of Mathematics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, 10520, Thailand 2Centre of Excellence in Mathematics, CHE, Sri Ayutthaya Road, Bangkok, 10400, Thailand Full list of author information is available at the end of the article Abstract This paper is concerned with the existence of extremal solution...

Existence of solutions reaction-diffusion systems equations in unbounded domains is studied by the Leray–Schauder (LS) method based on topological degree for elliptic operators and a priori estimates weighted spaces. We identify some which there exist two subclasses separated function space, monotone nonmonotone solutions. A existence are obtained allowing to prove their LS method. Various appl...