### UMD Math Weekly Colloquium/Seminar Notices for

Sat, February 17, 2018 to Fri, February 23, 2018

**Algebra-Number Theory - Ramification Theory for Arbitrary Valuation Rings in Positive Characteristic.**

Speaker: Vaidehee Thatte (Queen's University, Ontario, Canada) - http://mast.queensu.ca/~vaidehee/*Abstract: In classical ramification theory, we consider extensions of complete discrete valuation rings with perfect residue fields. We would like to study arbitrary valuation rings with possibly imperfect residue fields and possibly non-discrete valuations of rank >=1, since many interesting complications arise for such rings. In particular, defect may occur (i.e. we can have a non-trivial extension, such that there is no extension of the residue field or the value group). We present some new results for Artin-Schreier extensions of arbitrary valuation fields in positive characteristic p. These results relate the \higher ramifi cation ideal" of thee extension with the ideal generated by the inverses of Artin-Schreier generators via the norm map. We also introduce a generalization and further refinement of Kato's refined Swan conductor in this case. Similar results are true in mixed characteristic (0; p).*

When: Mon, February 19, 2018 - 2:00pm

Where: Kirwan Hall 3206

**RIT on Applied PDE - Measures of Measures and PDEs in Infinite Dimensions**

Speaker: Pierre-Emmanuel Jabin (University of Maryland) -

When: Mon, February 19, 2018 - 3:00pm

Where: Kirwan Hall 1311

**Geometry-Topology - Hyperbolic surfaces as singular flat surfaces**

Speaker: Aaron Feynes (University of Toronto) - http://www.math.toronto.edu/afenyes/

When: Mon, February 19, 2018 - 3:15pm

Where: Kirwan Hall 3206

**RIT on Quantum Information - Morphisms in categories of nonlocal games (cont'd)**

Speaker: Brad Lackey (University of Maryland) - http://www.umiacs.umd.edu/~bclackey

When: Mon, February 19, 2018 - 4:15pm

Where: Atlantic 3100A

**Geometry-Topology**

Speaker: Andy Neitzke (University of Texas) - https://www.ma.utexas.edu/users/neitzke/

When: Tue, February 20, 2018 - 10:00am

Where: Kirwan Hall 3206

**Logic - Model Theory Reading Seminar**

Speaker: Vince Guingona (Towson University) -

When: Tue, February 20, 2018 - 2:00pm

Where: Kirwan Hall 1311

**Norbert Wiener Center - Heat diffusion on inverse limit spaces**

Speaker: Patricia Alonso Ruiz (U Conn) -

When: Tue, February 20, 2018 - 2:00pm

Where: Kirwan Hall 3206

**Logic - Independence in generic expansions and fusions**

Speaker: Alex Kruckman (Indiana University) -

When: Tue, February 20, 2018 - 3:30pm

Where: Kirwan Hall 1311

**Numerical Analysis - Nonconforming Finite Element Methods for High Order Elliptic Equations in R ^{n}**

Speaker: Shuonan Wu (Penn State University) - http://www.personal.psu.edu/sxw58/

When: Tue, February 20, 2018 - 3:30pm

Where: Kirwan Hall 3206

**Student Algebraic Geometry Seminar - The T^i functors**

Speaker: Yousheng Shi (UMD) -

When: Tue, February 20, 2018 - 3:30pm

Where: Math 0104

**RIT on Statistics - False Discovery Rates**

Speaker: Yunjiang Ge (STAT Program) -

When: Tue, February 20, 2018 - 4:00pm

Where: MTH 1313

**Student Geometry and Topology - The dilogarithm function and hyperbolic volume**

Speaker: Laura Iosip () -

When: Wed, February 21, 2018 - 1:00pm

Where: Kirwan Hall 1310

**CSCAMM - Boundary layers and the vanishing viscosity limit in incompressible flows**

Speaker: Prof. Anna Mazzucato (Mathematics, Penn State University) - http://www.personal.psu.edu/alm24/

When: Wed, February 21, 2018 - 2:00pm

Where: CSIC 4122

**Lie Groups and Representation Theory - Categorification of Young idempotents**

Speaker: Matthew Hogancamp (University of Southern California), http://www-bcf.usc.edu/~hogancam/*Abstract: I will discuss joint work with Ben Elias in which we construct complexes of Soergel bimodules which categorify the Young idempotents in the Hecke algebras of type A_n. The construction is an application our theory of categorical diagonalization to the case of the full twist Rouqiuer complex acting on Soergel bimodules. Our categorified Young idempotents are key elements in the Gorsky-Negut-Rasmussen conjectures, which relate categories of Soergel bimodules to Hilbert schemes of points in the plane. I will explain this connection, and give several examples.*

When: Wed, February 21, 2018 - 2:00pm

Where: Kirwan 1311

**Student AMSC - "Low-rank iterative solvers for stochastic PDEs" and TBA**

Speaker: Tengfei Su and TBA (AMSC) -

When: Wed, February 21, 2018 - 3:00pm

Where: Kirwan Hall 1310

**Colloquium - Alpha invariants and birational geometry**

Speaker: Ivan Cheltsov (University of Edinburgh, UK) - http://www.maths.ed.ac.uk/cheltsov/*Abstract: Tian introduced alpha invariants to study the existence of Kahler-Einstein metrics on Fano manifolds. In this talk we describe (explicit and implicit) appearance of alpha invariants in (global and local) birational geometry. *

When: Wed, February 21, 2018 - 3:15pm

Where: Kirwan Hall 3206

**RIT on Deep Learning - Training Quantized Nets: A Deeper Understanding**

Speaker: Liam Fowl (UMD) -

When: Thu, February 22, 2018 - 10:00am

Where: Kirwan Hall 3206

**Applied Dynamics - Classical-to-quantum correspondence and transitions in chaotic dynamics of out-of-time-ordered correlators**

Speaker: Victor Galitski - UMD Physics

When: Thu, February 22, 2018 - 12:30pm

Where: ERF 1027

**Dynamics - Stochastic properties of the Z^2-periodic Sinai billiard**

Speaker: (Francoise Pene) - http://lmba.math.univ-brest.fr/perso/francoise.pene/

When: Thu, February 22, 2018 - 2:00pm

Where: Kirwan Hall 1311

**RIT on Geometry and Physics - Geometry of parameter space**

Speaker: Freddy Cisneros -

When: Thu, February 22, 2018 - 3:30pm

Where: Physics Bldg 1117

**Special Lecture - Topics in the Nonlinear Schrodinger Equation - Lecture Series (JHU)**

Speaker: Benjamin Dodson

When: Fri, February 23, 2018 - 2:00pm

Where: Room 1313 Kirwan Hall

**Colloquium - Nonlinear fluid-structure interaction with fiber-reinforced soft composites: a unified mathematical framework for mathematical analysis, computation and applications**

Speaker: Suncica Canic (University of Houston) - https://www.math.uh.edu/~canic/

When: Fri, February 23, 2018 - 3:15pm

Where: Kirwan Hall 3206

A listing of This Week's Talks is available online at: http://www-math.umd.edu/research/this-weeks-seminars.html

### Ph.D. Oral Exams

**Ph.D. Preliminary Oral Exam - Restless Bandits with Non-stationary Rewards**Speaker: Guowei Sun

When: Wed, February 21, 2018 - 9:15am

Where: 2224 AVW

**Ph.D. Final Oral Exam - Numerical Methods for Non-Linear Geometric PDEs, Numerical Analysis and Computation**

Speaker: Dimitrios Ntogkas

When: Thu, March 29, 2018 - 11:30am

Where: 1310 MTH

### Social Events

**Ice Cream Social & Cookie Time**When: Mon, March 12, 2018 - 2:30-3:15pm

Where: Rotunda (1st floor of Math Building)

### Geometry Week at UMD

March 12-16, 2018

Following our regular Geometry-Topology and Informal Geometric Analysis seminars we will have pizza receptions to attract new geometers. If you are an undergraduate or graduate student curious about Geometry, please attend (free pizza). Graduate students, undergraduate students, and postdocs are especially encouraged to participate.

**Geometry–Topology Seminar****Women in Geometry Pizza**** Reception**Speaker: Chaya Norton (Concordia University)

When: Mon, March 12 - 3:15pm

Where: Kirwan Hall 3206

**Informal Geometric Analysis Seminar****Graduate Students in Geometry Pizza**** Reception**

Speaker: Eleonora Di Nezza (IHES)

When: Tues, March 13 - 4pm

Where: Kirwan Hall 2300

**Pi Day Colloquium**

Speaker: Richard Schwartz (Brown University)

When: Wed, March 14 - 3:15pm

Where: Kirwan Hall 3206

**Distinguished Lectures in Geometric Analysis**

Speaker: Richard Schoen (Stanford & UC Irvine)

When: Thursday–Friday, March 15–16

Please visit https://www-math.umd.edu/geometry-week.html for more details.