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arXiv · 2610.24912

An explicit section of the Laudenbach-type exact sequence of the big mapping class group of $M_Γ$

Jorge Andres Robinson Arrieta
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Abstract

Given a locally finite graph $Γ$, Udall proved that the mapping class group of the doubled handlebody associated to $Γ$ is an extension of the mapping class group of $Γ$ by a possibly infinite direct product of $\mathbb{Z}_2$, and that this extension splits. We give a formula for Udall's section restricted to the pure mapping class group and, when $Γ$ has finitely many ends, on the whole mapping class group.

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Jorge Andres Robinson Arrieta. 2026-10-17. An explicit section of the Laudenbach-type exact sequence of the big mapping class group of $M_Γ$. https://arxiv.org/abs/2610.24912

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