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A variation of Thompson's conjecture for the symmetric groups
Czechoslovak Mathematical Journal ( IF 0.4 ) Pub Date : 2020-01-29 , DOI: 10.21136/cmj.2020.0501-18
Mahdi Abedei , Ali Iranmanesh , Farrokh Shirjian

Let G be a finite group and let N ( G ) denote the set of conjugacy class sizes of G . Thompson’s conjecture states that if G is a centerless group and S is a non-abelian simple group satisfying N ( G ) = N ( S ), then G ≅ S . In this paper, we investigate a variation of this conjecture for some symmetric groups under a weaker assumption. In particular, it is shown that G ≅ Sym( p + 1) if and only if | G | = ( p + 1)! and G has a special conjugacy class of size ( p + 1)!/ p , where p > 5 is a prime number. Consequently, if G is a centerless group with N ( G ) = N (Sym( p + 1)), then G ≅ Sym( p + 1).

中文翻译:

对称群的汤普森猜想的变体

令 G 是一个有限群,并令 N ( G ) 表示 G 的共轭类大小的集合。汤普森猜想指出,如果 G 是无心群,S 是满足 N ( G ) = N ( S ) 的非阿贝尔单群,则 G ≅ S 。在本文中,我们在较弱的假设下研究了一些对称群的这种猜想的变化。特别地,证明 G ≅ Sym( p + 1) 当且仅当 | G | = ( p + 1)!并且 G 具有大小为 ( p + 1)!/ p 的特殊共轭类,其中 p > 5 是素数。因此,如果 G 是 N ( G ) = N (Sym( p + 1)) 的无心群,则 G ≅ Sym( p + 1)。
更新日期:2020-01-29
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