Trivial intersection of blocks and nilpotent subgroups

Trivial intersection of blocks and nilpotent subgroups
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块和幂零子群的平凡交集

DOI:
10.1016/j.jalgebra.2020.03.037
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发表时间:
2020-10
期刊:
影响因子:
0.9
通讯作者:
Zhang Jiping
Zhang Jiping
中科院分区:
数学3区
文献类型:
--
作者:
Liu Yanjun;Willems Wolfgang;Xiong Huan;Zhang Jiping

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Let p, q be different primes and suppose that the principal p-and the principal q-block of a finite group have only one irreducible complex character in common, namely the trivial one. We conjecture that this condition implies the existence of a nilpotent Hall {p, q}-subgroup and prove that a minimal counter-example must be an almost simple group where pq divides the order of its simple nonabelian normal subgroup. As an immediate consequence we obtain that the conjecture holds true for p-solvable or q-solvable groups. Furthermore, we prove the conjecture in case 2∈{p, q} using the classification theorem of finite simple groups. Finally, we consider the situation that the intersection of an arbitrary p-block with an arbitrary q-block contains only one irreducible character.
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