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 > Junior Algebra/Logic/Number Theory seminar > Thar she blows - in pursuit of a classification of finite index subgroups of SL_2(Z) in terms of wallpaper groups

## Thar she blows - in pursuit of a classification of finite index subgroups of SL_2(Z) in terms of wallpaper groupsAdd to your list(s) Download to your calendar using vCal - Marj Batchelor
- Friday 19 October 2012, 14:00-15:00
- MR4.
If you have a question about this talk, please contact Jonathan Nelson. There is an equivariant map from the upper half plane (with SL_2(Z) acting by mobius transformations) to the complex plane (with the action of a subgroup affine transformations which preserve a triangular lattice). The homomorphism from SL_2(Z) onto this group of affine transformations provides an obvious source of finite index subgroups of SL_2(Z). The conjecture is that finite index subgroups are all “lifts” of subgroups of the translation subgroup. I will describe why the equivariant map is plausible, and talk about the kernel of the homorphism and the lifts of translation groups. This talk is part of the Junior Algebra/Logic/Number Theory 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
- Hanchen DaDaDash
- Interested Talks
- Junior Algebra/Logic/Number Theory seminar
- MR4
- School of Physical Sciences
- bld31
- ndb35's list
Note that ex-directory lists are not shown. |
## Other listsInstitute of Astronomy Extra Talks Thinking Society: The Place of the Intellectual Visiting Scholar Seminars## Other talksModelling seasonal acceleration of land terminating sectors of the Greenland Ice Sheet margin Faster C++ A physical model for wheezing in lungs Wetting and elasticity: 2 experimental illustrations Comparative perspectives on social inequalities in life and death: an interdisciplinary conference My Life in Science Seminar â€œPublishing in Science: an Inside Look" |