Applied Algebra Seminar Spring 2020

When: 11:00am, Thursdays

Where: 901 Van Vleck Hall

List: mathaas@lists.wisc.edu, to join email join-mathaas@lists.wisc.edu

Contact: Shamgar Gurevich, Jose Israel Rodriguez

Remark: We usually have a gap of around 2-3 weeks between seminars.

Spring 2020 Schedule

date	speaker	title	host(s)
February 20	Carla Michini (UW Madison)	Short simplex paths in lattice polytopes	Local
February 27
March 5
March 12
March 19	Spring Break
March 26
April 2
April 9
April 16	(Reserved)	Jose
April 23

Abstracts

Carla Michini

Short simplex paths in lattice polytopes

We consider the problem of optimizing a linear function over a lattice polytope P contained in [0,k]^n and defined via m linear inequalities. We design a simplex algorithm that, given an initial vertex, reaches an optimal vertex by tracing a path along the edges of P of length at most O(n^6 k log k). The length of this path is independent on m and is the best possible up to a polynomial function, since it is only polynomially far from the worst case diameter. The number of arithmetic operations needed to compute the next vertex in the path is polynomial in n, m and log k. If k is polynomially bounded by n and m, the algorithm runs in strongly polynomial time. This is a joint work with Alberto Del Pia.

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Other events to note

date	event/title	speaker
February 7	Talk: Inverse Problems, Imaging and Tensor Decomposition	Joe Kileel (Princeton)
February 10	Talk: Matroids, log-concavity, and expanders	Cynthia Vinzant (NCSU)

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