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Texas A&M University
Mathematics

Events for 03/27/2015 from all calendars

Working Seminar on Nonlinear Geometries

iCal  iCal

Time: 10:30AM - 11:30AM

Location: BLOC 220

Speaker: TBA

Title:


Mathematical Physics and Harmonic Analysis Seminar

iCal  iCal

Time: 1:50PM - 2:50PM

Location: BLOC 628

Speaker: Jared Wunsch, Northwestern University

Title: High frequency estimates for the Helmholtz equation with applications to boundary integral equations.

Abstract: I will discuss joint work with Dean Baskin and Euan Spence on high frequency estimates for the Helmholtz equation in exterior domains as well as for the interior impedance problem. Motivations for these estimates comes from certain problems in numerical analysis.


Algebra and Combinatorics Seminar

iCal  iCal

Time: 3:00PM - 3:50PM

Location: BLOC 628

Speaker: Sherilyn Tamagawa, UC Santa Barbara

Title: Quandles of Virtual Knots

Abstract: We will explore algebraic invariants on a special class of knots, known as virtual knots. Our main focus will be on quandles, an algebraic structure which serves as a perfect knot invariant, but is usually impossible to compute. We construct new invariants by taking quotients of quandles, and introduce a variation on the Alexander polynomial.


Linear Analysis Seminar

iCal  iCal

Time: 4:00PM - 5:00PM

Location: BLOC 220

Speaker: Da Zheng, University of Houston

Title: The Operator System Generated by Cuntz Isometries

Abstract: In this talk, we will consider the operator system Sn, for n greater than 2, generated by isometries s1,...,sn satisfying the Cuntz relation: s1s1* +...+ snsn*=I. We will exhibit an operator system En ⊆ Mn living in the n by n matrices and prove that Sn is completely order isomorphic to a quotient of En. Next, we will study tensor products of Sn and examine the various notions of nuclearity of Sn in the category of operator systems. Finally, some open problems are discussed.


Geometry Seminar

iCal  iCal

Time: 4:00PM - 5:00PM

Location: Bloc 628

Speaker: Martha Precup, Baylor University

Title: Regular Hessenberg varieties and generalized exponents

Abstract: Hessenberg varieties are closed subvarieties of the full flag variety. In this talk, we will show that regular Hessenberg varieties are irreducible. The Betti numbers of these varieties count certain subsets of positive roots. Using these subsets, we will define natural numbers that generalize the exponents of Sn in type A and discuss some geometric questions that follow from this construction.

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