Farrell cohomology of low genus pure mapping class groups with punctures

Details Farrell cohomology of low genus pure mapping class groups with punctures Farrell cohomology of low genus pure mapping class groups with punctures

2002-07-22

arxiv.org/abs/math/0207174v1

Algebr. Geom. Topol. 2 (2002) 537-562

Mathematics

Algebraic Topology

Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol2/agt-2-26.abs.html

Scientific paper

In this paper, we calculate the p-torsion of the Farrell cohomology for low genus pure mapping class groups with punctures, where p is an odd prime. Here, `low genus' means g=1,2,3; and `pure mapping class groups with punctures' means the mapping class groups with any number of punctures, where the punctures are not allowed to be permuted. These calculations use our previous results about the periodicity of pure mapping class groups with punctures, as well as other cohomological tools. The low genus cases are interesting because we know that the high genus cases can be reduced to the low genus ones. Also, the cohomological properties of the mapping class groups without punctures are closely related to our cases.

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