Mathematical Sciences Geometry/Topology Seminar

April 22 (This is a Tuesday) Joint with the Algebra Seminar:
Speaker: Dani Wise (McGill University)
Title: Nonpositive immersions, local indicability and coherence

Abstract: A group G is locally indicable if every nontrivial finitely generated subgroup of G has an infinite cyclic quotient. A group G is coherent if every finitely generated subgroup of G is finitely presentable. I will discuss a certain Euler characteristic condition on a 2-complex X which implies that the fundamental group of X is both locally indicable and coherent.