On groups generated by two positive multi-twists: Teichmueller curves and Lehmer's number

Christopher J. Leininger

doi:10.2140/gt.2004.8.1301

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On groups generated by two positive multi-twists: Teichmueller curves and Lehmer's number

Christopher J. Leininger

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Abstract

From a simple observation about a construction of Thurston, we derive several interesting facts about subgroups of the mapping class group generated by two positive multi-twists. In particular, we identify all configurations of curves for which the corresponding groups fail to be free, and show that a subset of these determine the same set of Teichmueller curves as the non-obtuse lattice triangles which were classified by Kenyon, Smillie, and Puchta. We also identify a pseudo-Anosov automorphism whose dilatation is Lehmer's number, and show that this is minimal for the groups under consideration. In addition, we describe a connection to work of McMullen on Coxeter groups and related work of Hironaka on a construction of an interesting class of fibered links.

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Christopher J. Leininger. 2004-10-26. On groups generated by two positive multi-twists: Teichmueller curves and Lehmer's number. https://doi.org/10.2140/gt.2004.8.1301

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