Necessary and sufficient conditions for McShane's identity and variations

Mathematics – Geometric Topology

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Minor corrections, acknowlegement and correct reference to Akiyoshi-Miyachi-Sakuma for Theorem 1.3, and finally, a new result

Scientific paper

Greg McShane introduced a remarkable identity for lengths of simple closed geodesics on the once punctured torus with a complete, finite volume hyperbolic structure. Bowditch later generalized this and gave sufficient conditions for the identity to hold for general type-preserving representations of a free group on two generators \Gamma to SL(2,C). In this note we extend Bowditch's result by giving necessary and sufficient conditions for the identity to hold, and also for the generalized McShane identity to hold for arbitrary (not necessarily type preserving) representations. We also give a version of Bowditch's variation of McShane's identity to once-punctured torus bundles, to the case where the monodromy is generated by a reducible element, and provide necessary and sufficient conditions for the variation to hold.

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