Note: This talk begins with a pre-seminar (aimed at graduate students) at 3:30–4:00. The main talk starts at 4:10.
We characterize quotients of specific families of positroids. Positroids are a special class of representable matroids introduced by Postnikov in the study of the nonnegative part of the Grassmannian. Postnikov defined several combinatorial objects that index positroids. In this talk, we make use of two of these objects to combinatorially characterize when certain positroids are quotients. Furthermore, we conjecture a general rule for quotients among arbitrary positroids on the same ground set. This is joint work with Carolina Benedetti and Daniel Tamayo.
The UW combinatorics seminar is inviting you to a scheduled Zoom meeting.
Topic: UW combinatorics seminar: Anastasia Chavez
Time: Apr 22, 2020 03:30 PM Pacific Time (US and Canada)
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Meeting ID: 776 544 369