Generalizing a theorem of P. Hall on finite-by-nilpotent groups

Details Generalizing a theorem of P. Hall on finite-by-nilpotent groups Generalizing a theorem of P. Hall on finite-by-nilpotent groups

2007-12-21

arxiv.org/abs/0712.3667v1

Mathematics

Group Theory

Scientific paper

Let $\gamma_i(G)$ and $Z_i(G)$ denote the $i$-th terms of the lower and upper
central series of a group $G$, respectively. P. Hall showed that if
$\gamma_{i+1}(G)$ is finite then the index $|G:Z_{2i}(G)|$ is finite. We prove
that the same result holds under the weaker hypothesis that
$|\gamma_{i+1}(G):\gamma_{i+1}(G)\cap Z_i(G)|$ is finite.

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