# Week beginning January 31, 2016 Mathematics Seminars

## Colloquium

### Unifying Mirror Symmetry Constructions

##### Professor David Favero (University of Alberta)
Abstract: While, given a Calabi-Yau manifold, string theory predicts the existence of a "mirror" Calabi-Yau manifold, the various constructions of the mirror proposed by physicists and mathematicians do not always agree. So, who has the right construction? As it turns out, everyone does! I will give an introduction to mirror symmetry and discuss some “multiple mirror” phenomena particularly in the Berglund-Hubsch-Krawitz construction of mirror pairs. Then, I will survey some conjectures and results which unify these mirrors through birational geometry and homological algebra. Slides will be available at http://www.ualberta.ca/~favero if you would like to follow along on your laptop during the talk

### Monday, 1 February 2016

#### IMA Postdoc Seminar

On optimal low-rank approximation of non-negative matrices at 2:25p.m. in Lind Hall 305
Christian Grussler  (Lund University)

#### Topology Seminar

Iterated algebraic K-theory and T-duality, II at 2:30p.m. in VinH 364
Craig Westerland  (University of Minnesota)
We introduce a periodic form of the iterated algebraic K-theory of ku, the (connective) complex K-theory spectrum, as well as a natural twisting of this ... ( more )

#### Automorphic Forms and Number Theory

Dixmier-Malliavin's proof at 3:35p.m. in VinH 301
Paul Garrett

### Tuesday, 2 February 2016

#### Climate Seminar

Challenges in adapting the Budyko energy balance model to Pluto at 11:15a.m. in VinH 570
Alice Nadeau  (U o M Mathematics Department)

#### Differential Geometry / Symplectic Topology Seminar

Differential Geometry and Symp. Topology at 1:25p.m. in VinH 570

#### IMA Data Science Lab Seminar

Vladimir Cherkassky: Methodological Aspects of Predictive Data Analytics and VC-theory at 1:25p.m. in Lind 305
Vladimir Cherkassky (University of Minnesota, Twin Cities)

Vapnik-Chervonenkis theory (VC-theory), aka Statistical Learning Theory, provides a mathematical framework for predictive data-analytic modeling in machine learning, statistics, ... ( more )

### Wednesday, 3 February 2016

#### AMS Student Chapter Seminar

AMS Student Seminar - TBA at 12:20p.m. in VinH 313

#### Student Symplectic and Low Dimensional Topology Seminar

Student Symplectic and Low Dimensional topology - TBA at 1:25p.m. in VinH 206

#### PDE Seminar

On a corrected Fisher problem in population genetics at 3:35p.m. in VinH 213
Hans Weinberger  (U of M Mathematics Department)
Because of an error in calculating the derivative of a ratio, R.A. Fisher's derivation of his famous scalar equation to model the takeover of territory ... ( more )

### Thursday, 4 February 2016

#### IMA Annual Program

Kirsten Morris: Using Approximations in Controller Synthesis for Systems Modelled by Partial Differential Equations at 11:00a.m. in Lind 305
Kirsten Morris (University of Waterloo)There are essentially two approaches to controller design for systems modeled by a partial differential equation: direct and indirect. In direct ... ( more )

#### Math Club Seminar

Math club - TBA at 12:20p.m. in VinH 570

#### Differential Geometry / Symplectic Topology Seminar

Hodge integrals and integrable evolutionary PDEs at 1:25p.m. in VinH 570
Youjin Zhang  (Tsingua University)
For an arbitrary semisimple Frobenius manifold we construct an integrable hierarchy of Hamiltonian partial differential equations, which we call the Hodge hierarchy. In the particular ... ( more )

#### Student Combinatorics Seminar

Crystal bases and rigged configurations at 2:30p.m. in Murphy Hall 214
Travis Scrimshaw  (U of M Mathematics Department)

#### Colloquium

Unifying Mirror Symmetry Constructions at 3:30p.m. in VinH 16
Professor David Favero  (University of Alberta)
While, given a Calabi-Yau manifold, string theory predicts the existence of a "mirror" Calabi-Yau manifold, the various constructions of the mirror proposed by physicists and ... ( more )

### Friday, 5 February 2016

#### Math Physics Seminar

Bihamiltonian cohomologies and integrable systems at 11:00a.m. in VinH 570
Youjin Zhang  (Tsinghua University, Beijing China)
We consider the problem of classification of hierarchies of bihamiltonianintegrable PDEs that are closely related to the theory of Gromov-Witten invariants and 2D topological field ... ( more )

#### IMA Industrial Problems Seminar

Jason Haupt: Advanced Healthcare Research and Analytics: Catching fraud, Removing Waste, Finding Providers, and Happy Consumers at 1:25p.m. in Lind 305
Jason Haupt (UnitedHealth Group)UnitedHealthcare's Advanced Research and Analytics (ARA) teams solve business problems across all internal lines of business. During this presentation we will discuss ... ( more )

#### Probability Seminar

Proportional Switching in FIFO Networks at 2:30p.m. in VinH 213
Maury Bramson  (UMN)
A central problem in queueing theory is the development of policies that efficiently allocate available resources. Many standard policies have a fixed capacity at individual ... ( more )

#### Lie Theory Seminar

Introduction to Trace formulas at 3:30p.m. in VinH 206
Professor Chan Wan  (U of M Mathematics Department)

The \emph{$q$-integral} of a function $f(x)$ over an interval $[a,b]$ is defined by  \int_a^b f(x) d_qx = (1-q)\sum_{i=0}^\infty \left( f(bq^i) bq^i - f(aq^i) aq^i ... ( more )