- Series
- Geometry Topology Seminar
- Time
- Monday, September 23, 2013 - 3:05pm for 1 hour (actually 50 minutes)
- Location
- Skiles 006
- Speaker
- Tara Brendle – U Glasgow
- Organizer
- Dan Margalit
The so-called integral Burau representation gives a
symplectic representation of the braid group. In this talk we will
discuss the resulting congruence subgroups of braid groups, that is,
preimages of the principal congruence subgroups of the symplectic
group. In particular, we will show that the level 4 congruence braid
group is equal to the group generated by squares of Dehn twists. One
key tool is a "squared lantern relation" amongst Dehn twists. Joint work with Dan Margalit.