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Algebra Seminar
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Swarup Gadde
University of Melbourne

Canonical decompositions of groups and 3-manifolds

Friday 10th September, 12:05-12:55pm, Carslaw 175.

(Joint work with Peter Scott)

We discuss the analogues for groups of JSJ-decompositions of Haken 3-manifolds. A key new ingredient is the analogue of regular neighbourhoods in group theory. The analogues of imbeddings and immersions are already known; these correspond to splittings of groups over particular subgroups and almost invariant sets over subgroups.