Structure of the mapping class groups of surfaces: a survey and a prospect

Details Structure of the mapping class groups of surfaces: a survey and a prospect Structure of the mapping class groups of surfaces: a survey and a prospect

1999-11-21

arxiv.org/abs/math/9911258v1

Geom. Topol. Monogr. 2 (1999), 349-406

Mathematics

Geometric Topology

58 pages. Published copy, also available at http://www.maths.warwick.ac.uk/gt/GTMon2/paper20.abs.html

Scientific paper

In this paper, we survey recent works on the structure of the mapping class groups of surfaces mainly from the point of view of topology. We then discuss several possible directions for future research. These include the relation between the structure of the mapping class group and invariants of 3-manifolds, the unstable cohomology of the moduli space of curves and Faber's conjecture, cokernel of the Johnson homomorphisms and the Galois as well as other new obstructions, cohomology of certain infinite dimensional Lie algebra and characteristic classes of outer automorphism groups of free groups and the secondary characteristic classes of surface bundles. We give some experimental results concerning each of them and, partly based on them, we formulate several conjectures and problems.

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