Centrally extended mapping class groups from quantum Teichmuller theory

Published 28 Mar 2010 in math.GT and math.QA | (1003.5365v2)

Abstract: The central extension of the mapping class groups of punctured surfaces of finite type that arises in quantum Teichm\"uller theory is 12 times the Meyer class plus the Euler classes of the punctures. This is analogous to the result obtained in \cite{FS} for the Thompson groups.

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