Combinatorics Seminar: 2-associahedra

Wednesday, January 22 at 2:00pm to 2:50pm

This is a past event.

Kaprielian Hall (KAP), 245
3620 South Vermont Avenue, Los Angeles, CA 90089

Nate Bottman, USC

Abstract: I will explain my construction of the 2-associahedra, which are graded posets indexed by sequences of nonnegative integers. The 2-associahedra arose in symplectic geometry, where they control functoriality for a symplectic invariant called the Fukaya category. The elements of a 2-associahedron correspond to the degenerations in the compactified configuration space of marked points on vertical lines in R^2, up to translations and positive dilations. I will explain several properties of the 2-associahedra: they are abstract polytopes (in particular, they are thin and strongly connected); they are Eulerian lattices (joint with my student Dylan Mavrides); and they have an operad-like structure that makes it possible to compute the (flag)-f-vectors using generating function techniques. I will discuss the conjecture that the 2-associahedra can be realized as convex polytopes. This will be a combinatorics talk; in particular, I will assume no symplectic background.

Event Type

Lecture / Talk / Workshop


University Park Campus

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