نتایج جستجو برای: center-like subset

تعداد نتایج: 1007601  

Journal: :bulletin of the iranian mathematical society 0
h. e. bell department of mathematics‎, ‎brock university‎, ‎st‎. ‎catharines‎, ‎ontario l2s 3a1‎, ‎canada. m. n. daif department of mathematics‎, ‎al-azhar university‎, ‎nasr city(11884)‎, ‎cairo‎, ‎egypt.

we introduce center-like subsets z*(r,f), z**(r,f) and z1(r,f), where r is a ring and f is a map from r to r. for f a derivation or a non-identity epimorphism and r a suitably-chosen prime or semiprime ring, we prove that these sets coincide with the center of r.

We introduce center-like subsets Z*(R,f), Z**(R,f) and Z1(R,f), where R is a ring and f is a map from R to R. For f a derivation or a non-identity epimorphism and R a suitably-chosen prime or semiprime ring, we prove that these sets coincide with the center of R.

The main purpose of this paper is to introduce several concepts of the metric-like spaces. For instance, we define concepts such as equal-like points, cluster points and completely separate points. Furthermore, this paper is an attempt to present compatibility definitions for the distance between a point and a subset of a metric-like space and also for the distance between two subsets of a metr...

ژورنال: پژوهش های ریاضی 2022

Let G be a group. Neumann to answer a question of Paul Erdos proved that every infinite subset of G has two different comuting elements  if and only if G is center-by-finite. In this paper, we deal with Erdoschr('39')s question in different aspect and we show that every infinite subset X of G has two different elements x and y such that x^y=1  if and only if the exterior  center of G ihas finit...

2003
ABRAHAM A. KLEIN HOWARD E. BELL

We study the properties of certain center-like subsets of groups, which are obtained by localizing setwise commutativity conditions. 1. Introduction. Let G denote a group with center Z = Z(G); and for each subset A of G, denote by C(A) the centralizer of A in G. In this paper, we define several " center-like " subsets of G, investigate their properties and establish conditions for them to coinc...

Journal: :iranian journal of optimization 0
jafar fathali department of mathematics, shahrood university of technology, university blvd., shahrood, iran nader jafari rad department of mathematics, shahrood university of technology, university blvd., shahrood, iran sadegh rahimi sherbaf department of mathematics, shahrood university of technology, university blvd., shahrood, iran

an extended star is a tree which has only one vertex with degree larger than two. the -center problem in a graph  asks to find a subset  of the vertices of  of cardinality  such that the maximum weighted distances from  to all vertices is minimized. in this paper we consider the -center problem on the unweighted extended stars, and present some properties to find solution.

Let $G$ be a bipartite graph. In this paper we consider the two kind of location problems namely $p$-center and $p$-median problems on bipartite graphs. The $p$-center and $p$-median problems asks to find a subset of vertices of cardinality $p$, so that respectively the maximum and sum of the distances from this set to all other vertices in $G$ is minimized. For each case we present some proper...

Jafar Fathali, Nader Jafari Rad Sadegh Rahimi Sherbaf

An extended star is a tree which has only one vertex with degree larger than two. The -center problem in a graph  asks to find a subset  of the vertices of  of cardinality  such that the maximum weighted distances from  to all vertices is minimized. In this paper we consider the -center problem on the unweighted extended stars, and present some properties to find solution.

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