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Recognizing alternating groups A p +3 for certain primes p by their orders and degree patterns |
A. A. HOSEINI1,A. R. MOGHADDAMFAR2, |
1.Department of Mathematics,
K. N. Toosi University of Technology, P. O. Box 16315-1618, Tehran,
Iran; 2.Department of Mathematics,
K. N. Toosi University of Technology, P. O. Box 16315-1618, Tehran,
Iran;School of Mathematics,
Institute for Research in Fundamental Sciences (IPM), P. O. Box 19395-5746,
Tehran, Iran; |
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Abstract The degree pattern of a finite group M has been introduced by A. R. Moghaddamfar et al. [Algebra Colloquium, 2005, 12(3): 431―442]. A group M is called k-fold OD-characterizable if there exist exactly k nonisomorphic finite groups having the same order and degree pattern as M. In particular, a 1-fold OD-characterizable group is simply called OD-characterizable. In this article, we will show that the alternating groups Ap+3 for p = 23, 31, 37, 43 and 47 are OD-characterizable. Moreover, we show that the automorphism groups of these groups are 3-fold OD-characterizable. It is worth mentioning that the prime graphs associated with all these groups are connected.
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Keywords
OD-characterization of finite group
degree pattern
prime graph
alternating and symmetric groups
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Issue Date: 05 September 2010
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