|Date: Friday, April 11, 2014
Location: 3866 East Hall (4:10 PM to 5:00 PM)
Title: The twist for positroids
Abstract: There are two strategies for finding cluster tori inside positroid varieties: In one, these tori are images of boundary measurement maps. In the other, they are given by imposing that various collections of Plucker coordinates are nonzero. It is not clear that either of these constructions gives tori, nor how they are related. We will prove that these constructions do give tori; the sets of tori are not the same but are related by a twist map analogous to that of Berenstein-Fomin-Zelevinsky and generalizing that of Marsh-Scott. Joint work with Greg Muller.
Speaker: David Speyer
Institution: U. Michigan