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arXiv · 1512.08215

A characterization of A_5 by its Same-order type

L. Jafari Taghvasani·M. Zarrin
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Abstract

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-order type of G. Shen et al. (Monatsh. Math. 160 (2010), 337-341.), showed that A5 is the only group with the same-order type f1; 15; 20; 24g. In this paper, among other things, we prove that a nonabelian simple group G has same-order type fr; m; n; kg if and only if G ?= A5.

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L. Jafari Taghvasani, M. Zarrin. 2015-12-27. A characterization of A_5 by its Same-order type. https://arxiv.org/abs/1512.08215

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