Let G be a group and Zn(G) be the n-th term of upper central series of G, for every n ≥ 1. The n-th central graph of G denoted by Γn z (G) is a simple graph whose vertices are elements of G and two distinct vertices x and y are adjacent if xy ∈ Zn...

How central is the music of Central Asia? Before discussing the music of Central Asia, we need to raise an epistemological question: whose perspective makes it central? Reaching almost 700 pages and trying to be politically neutral, The Music...

ABSTRACT

We will characterize all finite dimensional Lie algebras with at most |F|2+|F|+2

centralizers, where F is the underlying field of Lie algebras under consideration....

Abstract. The aim of this article is to give a new extension of

nilpotent groups in terms of an automorphism of the group which

is an ordinary nilpotent group, whenever we put an identity au-

tomorphism. ...

Jorband section is located in north slope of Central Alborz, and 28 km in south of Noor...