Campuses:

combinatorics

Tuesday, June 2, 2015 - 11:30am - 12:30pm
David Speyer (University of Michigan)
I will explain the plethora of combinatorial objects used to describe cluster structures on Grassmannians, such as plabic graphs, alternating strand diagrams, maximal weakly separated collections and plabic tilings. I will emphasize computational challenges, both ones which are theoretically routine but would be incredibly useful to implement, and those which require new ideas.
Tuesday, April 29, 2014 - 9:00am - 9:50am
Matthew Kahle (The Ohio State University)
(This is work in progress with Dominic Dotterrer and Larry Guth.)

In a graph, the girth is the length of the smallest cycle. How large
the girth can be for a graph on n vertices and m edges is a very well
studied problem in combinatorics. More generally, in a d-dimensional
simplicial complex, we define the d-systole to be the smallest
nonempty collection of closed d-dimensional faces whose union has no
boundary, and we measure the size of a systole in terms of volume,
Wednesday, August 3, 2011 - 11:20am - 11:40am
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