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A stronger form of Neumann’s BFC-theorem
Israel Journal of Mathematics ( IF 0.8 ) Pub Date : 2021-04-23 , DOI: 10.1007/s11856-021-2133-1
Cristina Acciarri , Pavel Shumyatsky

Given a group G, we write xG for the conjugacy class of G containing the element x. A famous theorem of B. H. Neumann states that if G is a group in which all conjugacy classes are finite with bounded size, then the derived group G′ is finite. We establish the following result.

Let n be a positive integer and K a subgroup of a group G such that ∣xG∣ ≤ n for each xK. Let H = 〈KG〉 be the normal closure of K. Then the order of the derived group H′ is finite and n-bounded.

Some corollaries of this result are also discussed.



中文翻译:

诺伊曼BFC定理的更强形式

给定的一组G ^,我们写X ģ为共轭类的ģ含有元素X。BH诺伊曼(BH Neumann)的一个著名定理指出,如果G是其中所有共轭类别都是有限且有界的组,则导出的组G '是有限的。我们建立以下结果。

Ñ是正整数和ķ一组的子组G ^使得| X ģ |≤ Ñ每个Xķ。令H = 〈K G〉为K的常闭。然后,导出的组H ′的阶为有限且为n界。

还讨论了此结果的一些推论。

更新日期:2021-04-24
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