Centrally extended mapping class groups from quantum Teichmuller theory

Details Centrally extended mapping class groups from quantum Teichmuller theory Centrally extended mapping class groups from quantum Teichmuller theory

2010-03-28

arxiv.org/abs/1003.5365v1

Mathematics

Geometric Topology

23p., 13 figures

Scientific paper

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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