On the absence of McShane-type identities for the outer space

Details On the absence of McShane-type identities for the outer space On the absence of McShane-type identities for the outer space

2006-02-14

arxiv.org/abs/math/0602291v1

Mathematics

Group Theory

Scientific paper

A remarkable result of McShane states that for a punctured torus with a complete finite volume hyperbolic metric we have \[ \sum_{\gamma} \frac{1}{e^{\ell(\gamma)}+1}={1/2} \] where $\gamma$ varies over the homotopy classes of essential simple closed curves and $\ell(\gamma)$ is the length of the geodesic representative of $\gamma$. We prove that there is no reasonable analogue of McShane's identity for the Culler-Vogtmann outer space of a free group.

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