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- W1640934655 abstract "We say A is a quasi-normal subgroup of the group G if the commensurator of A in G is all of G. We develop geometric versions of commensurators in finitely generated groups. In particular, g is an element of the commensurator of A in G iff the Hausdorff distance between A and gA is finite. We show that a quasi-normal subgroup of a group is the kernel of a certain map, and a subgroup of a finitely generated group is quasi-normal iff the natural coset graph is locally finite. This last equivalence is particularly useful for deriving asymptotic results for finitely generated groups. Our primary goal in this paper is to develop the basic theory of quasi-normal subgroups, comparing analogous results for normal subgroups and isolating differences between quasi-normal and normal subgroups." @default.
- W1640934655 created "2016-06-24" @default.
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- W1640934655 date "2009-12-29" @default.
- W1640934655 modified "2023-09-27" @default.
- W1640934655 title "Commensurators and Quasi-Normal Subgroups" @default.
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