COOKIES: By using this website you agree that we can place Google Analytics Cookies on your device for performance monitoring. |

University of Cambridge > Talks.cam > Differential Geometry and Topology Seminar > Dehn twists and free subgroups of the symplectic mapping class group

## Dehn twists and free subgroups of the symplectic mapping class groupAdd to your list(s) Download to your calendar using vCal - Ailsa Keating, MIT
- Wednesday 16 January 2013, 16:00-17:00
- MR13.
If you have a question about this talk, please contact Ivan Smith. Given two Lagrangian spheres in an exact symplectic manifold, we present conditions under which the Dehn twists about them generate a free non-abelian subgroup of the symplectic mapping class group. This extends a result of Ishida for Riemann surfaces. The proof generalises the categorical version of Seidel’s long exact sequence to arbitrary powers of a fixed Dehn twist. Time allowing, we construct families of examples containing such spheres. This talk is part of the Differential Geometry and Topology Seminar series. ## This talk is included in these lists:- All CMS events
- All Talks (aka the CURE list)
- CMS Events
- DPMMS Lists
- DPMMS Pure Maths Seminar
- DPMMS info aggregator
- DPMMS lists
- Differential Geometry and Topology Seminar
- MR13
- School of Physical Sciences
Note that ex-directory lists are not shown. |
## Other listsCambridge University Russian Society Cambridge Infectious Diseases Cambridge Coding Academy free tech talks## Other talksLogic programming: laxness and saturation Annular Khovanov-Lee theory and representation theory Extreme Ageing Extreme Weather Operator Algebras and Conformal Field Theory Predicting Intra-Day Load Profiles under Time-Of-Use Tariffs Using Smart Meter Data |