Generating groups by conjugation-invariant sets

Details Generating groups by conjugation-invariant sets Generating groups by conjugation-invariant sets

2011-05-30

arxiv.org/abs/1105.5844v1

Mathematics

Group Theory

15pp

Scientific paper

Let S be a generating set of a group G. We say that G has FINITE WIDTH relative to S if G=(S\cup S^{-1})^k for a suitable natural number k. We say that a group G is a group of FINITE C-WIDTH if G has finite width with respect to all conjugation-invariant generating sets. We give a number of examples of groups of finite C-width, and, in particular, we prove that the commutator subgroup F' of Thompson's group F is a group of finite C-width. We also study the behaviour of the class of all groups of finite C-width under some group-theoretic constructions; it is established, for instance, that this class is closed under formation of group extensions.

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