Salehi Amiri, S., Khalili Asboei, A., Iranmanesh, A., Tehranian, A. (2013). Quasirecognition by the prime graph of L_3(q) where 3 < q < 100. Bulletin of the Iranian Mathematical Society, 39(2), 289-305.

S. S. Salehi Amiri; A. R. Khalili Asboei; A. Iranmanesh; A. Tehranian. "Quasirecognition by the prime graph of L_3(q) where 3 < q < 100". Bulletin of the Iranian Mathematical Society, 39, 2, 2013, 289-305.

Salehi Amiri, S., Khalili Asboei, A., Iranmanesh, A., Tehranian, A. (2013). 'Quasirecognition by the prime graph of L_3(q) where 3 < q < 100', Bulletin of the Iranian Mathematical Society, 39(2), pp. 289-305.

Salehi Amiri, S., Khalili Asboei, A., Iranmanesh, A., Tehranian, A. Quasirecognition by the prime graph of L_3(q) where 3 < q < 100. Bulletin of the Iranian Mathematical Society, 2013; 39(2): 289-305.

Quasirecognition by the prime graph of L_3(q) where 3 < q < 100

Receive Date: 20 September 2011,
Revise Date: 29 February 2012,
Accept Date: 12 April 2012

Abstract

Let $G$ be a finite group. We construct the prime graph of $ G $, which is denoted by $ Gamma(G) $ as follows: the vertex set of this graph is the prime divisors of $ |G| $ and two distinct vertices $ p $ and $ q $ are joined by an edge if and only if $ G $ contains an element of order $ pq $. In this paper, we determine finite groups $ G $ with $ Gamma(G) = Gamma(L_3(q)) $, $2 leq q < 100 $ and prove that if $ q neq 2, 3 $, then $L_3(q) $ is quasirecognizable by prime graph, i.e., if $G$ is a finite group with the same prime graph as the finite simple group $L_3(q)$, then $G$ has a unique non-Abelian composition factor isomorphic to $L_3(q)$. As a consequence of our results we prove that the simple group $L_{3}(4)$ is recognizable and the simple groups $L_{3}(7)$ and $L_{3}(9)$ are $2-$recognizable by the prime graph.