Events for 02/26/2020 from all calendars

Faculty Retreat: Undergraduate Program

Time: 12:00PM - 1:30PM

Location: BLOC 220

Noncommutative Geometry Seminar

Time: 2:00PM - 3:00PM

Location: BLOC 628

Speaker: Hao Guo, Texas A&M University

Title: Functoriality of higher invariants for elliptic operators

Abstract: I will report on joint work with Zhizhang Xie and Guoliang Yu on functoriality properties of the higher index and higher rho invariant for elliptic differential operators on manifolds with symmetry. We show that given a homomorphism between the deck transformation group of a Galois cover and a quotient by a normal subgroup, the map induced on the level of group C*-algebras naturally relates the higher indices and higher rho invariants associated to the two group actions. We work with the maximal version of the group C*-algebra. Our results can be applied to the problem of computing higher invariants on a covering space, for example by relating it to higher invariants on finite-sheeted covers.

Groups and Dynamics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 220

Speaker: Yuri Bakhturin, Memorial University of Newfoundland

Title: Actions of maximal growth

Abstract: We study acts and modules of maximal growth over finitely generated free monoids and free associative algebras as well as free groups and free group algebras. The maximality of the growth implies some other specific properties of these acts and modules that makes them close to the free ones; at the same time, we show that being a strong "infiniteness" condition, the maximality of the growth can still be combined with various finiteness conditions, which would normally make finitely generated acts finite and finitely generated modules finite-dimensional. (Joint work with Alexander Olshanskii)

Title IX Compliance Training

Time: 4:00PM - 5:00PM

Location: BLOC 117

Speaker: Jennifer Smith, JD, Title IX Officer

Student/Postdoc Working Geometry Seminar

Time: 4:00PM - 5:00PM

Location: BLOC 624

Speaker: JM Landsberg, TAMU

Title: Smooth cubic surfaces

Graduate Student Organization Seminar

Time: 4:00PM - 5:00PM

Location: BLOC 628

Speaker: Josiah Owens

Title: An Overview of an Ergodic Theoretic Proof of Szemerédi's Theorem

Abstract: A discussion of Szemerédi's theorem, including some motivating historical notes, its equivalent formulations as Furstenberg's multiple recurrence theorem and multiple recurrence in ergodic systems. The latter to be shown as a consequence of a theorem stating that multiple recurrence lifts through weak mixing and compact extensions of measure preserving systems and a structure theorem describing the dichotomy between such extensions. The (partial) proofs of these last two facts will be presented.