Events for 08/31/2018 from all calendars

Probability Seminar

Time: 11:00AM - 12:00PM

Location: BLOC 628

Speaker: Alexander Roitershtein, TAMU (Statistics)

Title: A random walk with catastrophes

Abstract: I will discuss a discrete-time ergodic model for random population dynamics with linear growth and binomial catastrophes. In a catastrophe a large portion of the population can be eliminated with a significant probability. Through a coupling construction, we obtain sharp two-sided bounds for the rate of convergence to stationarity which are applied to show that the model exhibits a cutoff phenomenon. This is a joint work with Iddo Ben-Ari and Rinaldo B. Schinazi.

Algebra and Combinatorics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 628

Speaker: Catherine, Sarah, Yue

Title: Organizing meeting

Geometry Seminar

Time: 4:00PM - 4:50PM

Location: BLOC 628

Speaker: Frank Sottile, Texas A&M University

Title: Galois Groups for Systems of Sparse Polynomials

Abstract: Camille Jordan observed that Galois groups arise in enumerative geometry, and we now also understand them as monodromy groups. A study of this question in the Schubert calculus has determined many such Galois groups, all known Schubert Galois groups are either the full symmetric group or are imprimitive. Recently, Esterov considered this question for systems of sparse polynomials and proved this dichotomy in that setting. While this classification identifies polynomial systems with imprimitive Galois groups, it does not identify the groups.

I will sketch the background, before explaining Esterov's classification and ongoing work identifying some of the imprimitive Galois groups for polynomial systems.