Mathematics – Group Theory
Scientific paper
2005-12-12
Mem.Amer.Math.Soc. 196 (2008)
Mathematics
Group Theory
vi+190 pages, 11 figures
Scientific paper
We obtain some classification result for the mapping class groups of compact orientable surfaces in terms of measure equivalence. In particular, the mapping class groups of different closed surfaces can not be measure equivalent. Moreover, we give various examples of discrete groups which are not measure equivalent to the mapping class groups. In the course of the proof, we investigate amenability in a measurable sense for the actions of the mapping class group on the boundary at infinity of the curve complex and on the Thurston boundary. Using this investigation, we prove that the mapping class group of a compact orientable surface is exact.
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