Finitely annihilated groups

Details Finitely annihilated groups Finitely annihilated groups

2010-07-16

arxiv.org/abs/1007.2706v2

Mathematics

Group Theory

v1: 15 pages. v2: 19 pages, minor corrections and refinements made, introduction expanded. Submitted

Scientific paper

We say a group is finitely annihilated if it is the set-theoretic union of all its proper normal finite index subgroups. We investigate this new property, and observe that it is independent of several other well known group properties. For finitely generated groups, we show that in many cases it is equivalent to having non-cyclic abelianisation, and at the same time construct an explicit infinite family of counterexamples to this. We show for finitely presented groups that this property is neither Markov nor co-Markov. In the context of our work we show that the weight of a non-perfect finite group, or a non-perfect finitely generated solvable group, is the same as the weight of its abelianisation. We generalise a theorem of Brodie-Chamberlain-Kappe on finite coverings of groups, and finish with some generalisations and variations of our new definition.

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