# Algorithmic aspects of branched coverings III/V. Erasing maps, orbispaces, and the Birman exact sequence

13 Feb 2018 Bartholdi Laurent Dudko Dzmitry

Let $\tilde f\colon(S^2,\tilde A)\to(S^2,\tilde A)$ be a Thurston map and let $M(\tilde f)$ be its mapping class biset: isotopy classes rel $\tilde A$ of maps obtained by pre- and post-composing $\tilde f$ by the mapping class group of $(S^2,\tilde A)$. Let $A\subseteq\tilde A$ be an $\tilde f$-invariant subset, and let $f\colon(S^2,A)\to(S^2,A)$ be the induced map... (read more)

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• GROUP THEORY
• DYNAMICAL SYSTEMS