Mathematics Department

Upcoming Talks

This is a list of all upcoming talks for the next two weeks. Talks are from 3:45-4:45 p.m. in the Colloquium or Seminar Room, unless otherwise specified.

  • Dec
    08
  • Introduction to matroids, Kahler manifolds, tropical varieties, etc. Part 8
    Time: 12:00 PM
    Combinatorics, Algebra, & Topology Seminar

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    June's talks in this series connects work on matroids, Kahler manifolds, tropical varieties, etc. The talks can be found by going to the Fields Institute's video page: http://www.fields.utoronto.ca/video-archive/2016/07/
  • Dec
    08
  • Comparing polyhedral relaxations via volume
    Prof. Jon Lee
    University of Michigan
    Time: 03:45 PM
    Colloquium Series

    View Abstract

    With W. Morris in 1992, I introduced the idea of comparing polytopes relevant to combinatorial optimization via calculation of n-dimensional volumes. I will review some of that work (related to fixed-charge problems) and describe some new work, with E. Speakman, relevant to the spatial branch-and-bound approach to global optimization. In this new work, we calculate exact expressions for 4-dimensional volumes of natural parametric families of polytopes relevant to different convex relaxations of trilinear monomials. As a consequence, we have practical guidance (i) for tuning an aspect of spatial branch-and-bound implementations, and (ii) at the modeling level.
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