3 papers
math.GR2017
On number of isomorphism classes of derived subgroups
Leyli Jafari Taghvasani, Soran Marzang
In this paper we show that a finite nonabelian characteristically simple group G satisfying n = |π(G)|+2 if and only if G is isomorphic to A5, where n is the number of isomorphism…
math.GR2015
A characterization of A_5 by its Same-order type
L. Jafari Taghvasani, M. Zarrin
Let G be a group, define an equivalence relation s as below: 8 g; h 2 G g s h () jgj = jhj the set of sizes of equivalence classes with respect to this relation is called the same-…
math.GR2015
Shen's conjecture on groups with given same order type
L. Jafari Taghvasani, M. Zarrin
For any group , we define an equivalence relation as below: the set of sizes of equivalence cla…