## On complexity of 3-manifolds/On coordinates on virtual braid groups

Series:
Geometry Topology Seminar
Monday, October 27, 2014 - 2:05pm
1 hour (actually 50 minutes)
Location:
Skiles 006
,
Chelyabinsk State University
,
These are two half an hour talks.Evgeny's abstract: The most useful approach to a classication of 3-manifolds is the complexity theory foundedby S. Matveev. Unfortunately, exact values of complexity are known for few infinite seriesof 3-manifold only. We present the results on complexity for two infinite series of hyperbolic3-manifolds with boundary.Andrei's abstract: We define coordinates on virtual braid groups. We prove that these coordinates are faithful invariants of virtual braids on two strings, and present evidence that they are also very powerful invariants for general virtual braids.The talk is based on the joint work with V.Bardakov and B.Wiest.