# Subgroups of quasi-HNN groups

Abstract: We extend the structure theorem for the subgroups of the class of HNN groups to a new class of groups called quasi-HNN groups. The main technique used is the subgroup theorem for groups acting on trees with inversions.

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### Cites background from "Subgroups of quasi-HNN groups"

...7 of [7], there exists a reduced word w = g0....

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### "Subgroups of quasi-HNN groups" refers methods in this paper

...For different methods of finding the structures of subgroups of HNN groups we refer the readers to [1]....

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### "Subgroups of quasi-HNN groups" refers background in this paper

...For definitions of subgraphs, trees, morphisms of graphs, and Aut(X), the set of all automorphisms of the graph X which is a group under the composition of morphisms of graphs, see [5] or [9]....

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...In this section, we summarize the presentation for groups of groups acting on trees with inversions obtained by [5]....

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