On Gehring-Martin-Tan groups with an elliptic generator

preprint2016arXivOpen access

Abstract

The Gehring-Martin-Tan inequality for 2-generator subgroups of PSL(2,C) is one of the best known discreteness conditions. A Kleinian group GG is called a Gehring-Martin-Tan group if the equality holds for the group GG. We give a method for constructing Gehring-Martin-Tan groups with a generator of order four and present some examples. These groups arise as groups of finite volume hyperbolic 3-orbifolds.

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