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Unascertained normal subgroup is also studied.
并且研究了未确知正规子群。
Especially, people pay much attention to those normal subgroup.
这些子群中,人们特别关注那些正规的同余子群。
In Chapter 3, we investigate how the number of conjugacy classes outside a normal subgroup of a finite group influences its structure.
第三章主要研究有限群的正规子群外的共轭类的个数对群结构的影响。
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