Geometric Group Therapy Seminar

Speaker: Martín Blufstein (University of Copenhagen)

Title: A 2-complex with contracting non-positive immersions and positive maximal irreducible curvature

Abstract: In this talk, we will show that the 2-complex associated to the presentation ⟨a,b∣b,bab⁻¹a⁻²⟩ has contracting nonpositive immersions and positive maximal irreducible curvature. This example shows that the contracting non-positive immersions property is not equivalent to the notion of nonpositive irreducible curvature, answering a question raised by H. Wilton.