Published in Mediterranean Journal of Mathematics
We continue our study of the relation between existence of projective covers and existence of minimal sets of generators for right modules over an arbitrary ring.
Published in Mediterranean Journal of Mathematics
We analyse the global convergence of a Whittaker-type iterative method and obtain restricted global convergence domains, so that we can locate and separate solutions of Fredholm–Nemytskii nonlinear integral equations by means of balls. For this, we use two techniques, one based on the well-known fixed point theorem and the other on a system of recu...
Published in Mediterranean Journal of Mathematics
We establish sufficient conditions for the existence and uniqueness of (N,λ)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$(N,\lambda )$$\end{document}-periodic soluti...
Published in Mediterranean Journal of Mathematics
In this note, we mainly consider the trajectory attractors of the three-dimensional micropolar fluids with damping. Due to the existence of weak solutions, the existence of trajectory attractors for 3D micropolar fluids with damping term is proved for 1≤β0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} ...
Published in Mediterranean Journal of Mathematics
The main purpose of this paper is to study some properties of Vietoris’ number sequence and present some techniques, using special types of matrices that generates this number sequence.
Published in Mediterranean Journal of Mathematics
We prove the existence, nonexistence and multiplicity of positive solution to the problem -(ϕ(u′))′=λh(t)f(u),0
Published in Mediterranean Journal of Mathematics
We introduce new polynomial invariants for both planar knotoids and spherical knotoids. To introduce these invariants, we first introduce what we call polar knots, and give the fundamentals of their theory. Polar knots are knots with a finite number of points that do not allow strands slide over or under them. We focus on polar knots with two poles...
Published in Mediterranean Journal of Mathematics
We improve a previous unconditional result about the asymptotic behavior of ∑n≤xr(n)r(n+m)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\sum _{n\le x} r(n)r(n+m)$$\en...
Published in Mediterranean Journal of Mathematics
We study the performance of a new block preconditioner for a class of 3×3\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$3\times 3$$\end{document} block saddle point pr...
Published in Mediterranean Journal of Mathematics
Given two Banach spaces X and Y, we introduce and study a concept of norm-attainment in the space of nuclear operators N(X,Y)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{docume...
