# 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) | ||

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.

## 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) |