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arXiv 2603.22980math.GR
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有限的斜格子其加法群是Z群

Finite skew braces whose additive group is a Z-group

Dipartimento di Matematica, Università di Cagliari(卡利亚里大学数学系)

Marco Damele

AI总结:

本文研究了加法群为Z群的有限斜格子,证明其乘法群可解且近Sylow循环,且所有此类斜格子均为超可解,特别地为2- nilpotent,扩展并恢复了Rump的先前结果。

摘要:

Rump在[Theorem~1]{Rump2018ClassificationOC}中证明,若有限斜格子的加法群为循环群,则其乘法群可解且近Sylow循环。本文证明当加法群为Z群时,这种刚性仍成立。更具体地说,若B为加法群为Z群的有限斜格子,则(B,·)可解且近Sylow循环。此外,证明所有此类斜格子均为超可解;特别地,(B,·)为2- nilpotent。这扩展了[ballesterbolinches2024finiteskewbracessquarefree]中的定理3.8,并在更广泛背景下恢复了Rump[Proposition 13]{Rump2018ClassificationOC}的结果。最后,证明对于奇数阶的斜格子,加法群为Z群当且仅当乘法群为Z群。

英文摘要:

Rump proved in \cite[Theorem~1]{Rump2018ClassificationOC} that if a finite skew brace has cyclic additive group, then its multiplicative group is solvable and almost Sylow cyclic. In this paper we show that this rigidity persists when the additive group is a \(Z\)-group. More precisely, we prove that if \(B\) is a finite skew brace whose additive group is a \(Z\)-group, then \((B,\cdot)\) is solvable and almost Sylow cyclic. In addition, we show that every such skew brace is supersolvable; in particular, \((B,\cdot)\) is \(2\)-nilpotent. This extends \cite[Theorem~3.8]{ballesterbolinches2024finiteskewbracessquarefree} and recovers, in this broader setting, another result of Rump \cite[Proposition 13]{Rump2018ClassificationOC}. Finally, we prove that for skew braces of odd order the additive group is a \(Z\)-group if and only if the multiplicative group is a \(Z\)-group.

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