## Colloquium

##### Thursday, February 4, 2016 at 3:30p.m. in VinH 16

#####
**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 ...
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Please send an email to cwesterl@umn.edu for more information.

#### Automorphic Forms and Number Theory

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

**Paul Garrett**

Please send an email to garrett@umn.edu for more information.

### 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*)

Please send an email to mcgehee@umn.edu for more information.

#### Differential Geometry / Symplectic Topology Seminar

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

Please send an email to lixxx248@umn.edu for more information.

#### 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 )

Please send an email to lerman@umn.edu for more information.

### Wednesday, 3 February 2016

#### AMS Student Chapter Seminar

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

Please send an email to wil00108@umn.edu for more information.

#### Student Symplectic and Low Dimensional Topology Seminar

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

Please send an email to sagla004@umn.edu for more information.

#### 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 ...
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Please send an email to spirn@umn.edu for more information.

### 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 ...
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#### Math Club Seminar

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

Please send an email to olso4056@umn.edu for more information.

#### 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 ...
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Please send an email to lixxx248@umn.edu for more information.

#### Student Combinatorics Seminar

*Crystal bases and rigged configurations*at 2:30p.m. in Murphy Hall 214

**Travis Scrimshaw**(

*U of M Mathematics Department*)

Please send an email to douvr001@umn.edu for more information.

#### 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 ...
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more
)

Please send an email to cad@umn.edu for more information.

### 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 ...
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Please send an email to coxxx328@umn.edu for more information.

#### 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 ...
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#### 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 ...
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Please send an email to arnab@umn.edu for more information.

#### Lie Theory Seminar

*Introduction to Trace formulas*at 3:30p.m. in VinH 206

**Professor Chan Wan**(

*U of M Mathematics Department*)

Please send an email to dhjiang@math.umn.edu for more information.

#### Combinatorics Seminar

*On q-integrals over order polytopes*at 3:35p.m. in VinH 570

**Jang Soo Kim**(

*SKKU*)

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 ...
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Please send an email to mchmutov@GMAIL.com for more information.