On finite-by-nilpotent profinite groups
Publish place: International Journal of Group Theory، Vol: 9، Issue: 4
Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_THEGR-9-4_001
تاریخ نمایه سازی: 14 اردیبهشت 1400
Abstract:
Let $\gamma_n=[x_۱,\ldots,x_n]$ be the $n$th lower central word. Suppose that $G$ is a profinite group where the conjugacy classes $x^{\gamma_n(G)}$ contains less than $۲^{\aleph_۰}$ elements for any $x \in G$. We prove that then $\gamma_{n+۱}(G)$ has finite order. This generalizes the much celebrated theorem of B. H. Neumann that says that the commutator subgroup of a BFC-group is finite. Moreover, it implies that a profinite group $G$ is finite-by-nilpotent if and only if there is a positive integer $n$ such that $x^{\gamma_n(G)}$ contains less than $۲^{\aleph_۰}$ elements, for any $x\in G$.
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Authors
Eloisa Detomi
Dipartimento di Ingegneria dell&#۰۳۹;Informazione - DEI, Università di Padova,
Marta Morigi
Dipartimento di Matematica, Università di Bologna, Italy.