The properties of covering and universality between the central extensions and

also the structure of a covering group of perfect groups have been generalized

by S.Kayvanfar and M.R.R.Moghaddam (Indag. Mathem., N.S, 8(4), 1997, 537...

The class of slender groups is closed under direct sums, but it is not closed under
direct product. Also, the class of noncommutatively slender groups is closed under
weak direct products, but i t i s not closed under direct product. I n t his...

Abstract

Let { cal N}_c be the

variety of nilpotent groups of class at most c (c geq 1) .

We say that a group G is { cal N}_c -capable if

G cong E/Z_c(E) , for some group E .

In this talk it is shown...

Let $\\\\cal V$ be a variety of groups defined by the set of laws $V$. In this

paper, we will show that every group $G$ possesses a uniquely determined

subgroup $(V^*)^*(G)$ of marginal subgroup $V^*(G)$ , which is minimal...

V-Perfect Groups...

In this talk we extend Mycielski\\'s conjecture and the Van-Kampen Theorem for weak joins, to higher homotopy groups....

In this talk, we try to find some topological properties of topological homotopy groups...

P. Hall introduced the notion of isoclinism in order to classify groups of prime power order.

The notion of isoclinism can be simulated for pairs (G;N) of groups, in which G is a group and N

is a normal subgroup. This talk verifies...