Shaikh, A. A. Hui, S. K.
Published in
Lobachevskii Journal of Mathematics

The object of the present paper is to study and classify decomposable weakly conharmonically symmetric manifolds with several nontrivial examples.

Darus, M. Ibrahim, R. W.
Published in
Lobachevskii Journal of Mathematics

In the present article, a new class Σα, 0 ⩽ α

Hamdi, Nabil
Published in
Lobachevskii Journal of Mathematics

—In this paper, we are interested in the nonlinear transport equation in the class of essentially bounded functions. More precisely, we prove the existence and uniqueness of the inverse problem solution. Moreover, we give the size of the neighborhood from which we can bring the function of the overdetermination condition so that the solution of the...

Hamdi, N.
Published in
Lobachevskii Journal of Mathematics

In this paper, we are interested in the nonlinear transport equation in the class of essentially bounded functions. More precisely, we prove the existence and uniqueness of the inverse problem solution. Moreover, we give the size of the neighborhood from which we can bring the function of the overdetermination condition so that the solution of the ...

Dabbek, K.
Published in
Lobachevskii Journal of Mathematics

The purpose of this paper is to prove an extension result through a closed subset A having small Hausdorff dimension for a positive plurisubharmonic (Psh) current T of dimension p such that ddcT is of locally finite mass. As a consequence we prove that, if there exists a positive (resp. negative) current S such that T = ddcS on Ω\A, then the trivia...

Nabongo, D. Boni, T. K.
Published in
Lobachevskii Journal of Mathematics

This paper concerns the study of the numerical approximation for the following boundary value problem: \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ \begin{array}{*{...

Moghaddamfar, A. R. Pooya, S. M. H. Navid Salehy, S. Nima Salehy, S.
Published in
Lobachevskii Journal of Mathematics

The purpose of this article is to obtain several evaluations of determinants of matrices, the entries of which are given by some recursion relation, with various choices for the first rows and columns.

Kehayopulu, Niovi Tsingelis, Michael
Published in
Lobachevskii Journal of Mathematics

In this paper we give some equivalent definitions of fuzzy right (left) ideals and fuzzy bi-ideals which are useful for applications. In fact, they show how similar is the theory of ordered semigroups based on fuzzy ideals with the theory of ordered semigroups based on ideals or on ideal elements. Using these definitions the results on fuzzy ordere...

Van Dung, Nguyen
Published in
Lobachevskii Journal of Mathematics

This paper gives characterizations of locally separable metric spaces under some sequence-covering msss-mappings by means of certain kind of σ-locally countable networks. As the applications, we get new characterizations of sequence-covering, quotient msss-images of locally separable metric spaces.

Khan, Asghar Shabir, Muhammad
Published in
Lobachevskii Journal of Mathematics

In this paper, we introduce the concept of (α, β)-fuzzy interior ideal in ordered semigroups, which is a generalization of a fuzzy interior ideal in ordered semigroup. We investigate the related properties of ordered semigroups in terms of (α, β)-fuzzy interior ideals. The concepts of an (∈,∈ ∨q)-fuzzy interior ideal and (∈,∈ ∨q)-fuzzy ideal coinci...