Geometricity and Polygonality in Free Groups

Details Geometricity and Polygonality in Free Groups Geometricity and Polygonality in Free Groups

2009-10-27

arxiv.org/abs/0910.5019v2

Mathematics

Group Theory

19 pages, 9 figures. More figures and examples are added for clarification in Section 3

Scientific paper

Gordon and Wilton recently proved that the double D of a free group F amalgamated along a cyclic subgroup C of F contains a surface group if a generator w of C satisfies a certain 3-manifold theoretic condition, called virtually geometricity. Wilton and the author defined the polygonality of w which also guarantees the existence of a surface group in D. In this paper, virtual geometricity is shown to imply polygonality up to descending to a finite-index subgroup F' and applying an automorphism on F'. That the converse does not hold will follow from an example formerly considered by Manning.

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