Non proper HNN extensions and uniform uniform exponential growth

Details Non proper HNN extensions and uniform uniform exponential growth Non proper HNN extensions and uniform uniform exponential growth

2009-09-15

arxiv.org/abs/0909.2841v1

Mathematics

Group Theory

29 pages

Scientific paper

If a finitely generated torsion free group K has the property that all finitely generated subgroups S of K are either small or have growth constant bounded uniformly away from 1 then a non proper HNN extension G of K, that is a semidirect product of K by the integers, has the same property. Here small means cyclic or, if the automorphism has no periodic conjugacy classes, free abelian of bounded rank.

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