## Colloquium

##### Thursday, October 27, 2016 at 3:30p.m. in Vincent Hall 16

#####
**Ralph Kaufmann**
(*Purdue University, West Lafayette*)

**Abstract:**Feynman categories are a novel framework generalizing groups, algebras, substitution schemes, etc. as they appear in geometry, topology, number theory and mathematical physics. We start with the definition and basic examples including set theoretic examples and examples of graphs, such as Feynman graphs or those appearing in operad like theory. We then move on to give several constructions and secondary structures. These include resolutions, model category structure as well as Hopf algebras. The latter are a secondary structure that appears for instance in the theory of multi-zeta values, renormalization and double loop spaces.

### Monday, 24 October 2016

#### Reading Seminar on Automorphic Forms

*Reading Seminar for Automorphic Forms*at 9:00a.m. in VinH 570

Please send an email to wanxx123@umn.edu for more information.

#### Student Number Theory Seminar

*Student Number Theory Seminar*at 12:20p.m. in VinH 313

Please send an email to grodz007@umn.edu for more information.

#### Topology Seminar

*Affinization, Witt vectors and duality*at 2:30p.m. in VinH 311

**Aaron Royer**(

*UCLA*)

The Hochschild--Kostant--Rosenberg theorem relates the Hochschild homology and Andre--Quillen homology of smooth commutative algebras. Using ideas from derived algebraic geometry, Ben-Zvi--Nadler proved an HKR theorem ...
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Please send an email to cwesterl@umn.edu for more information.

#### Automorphic Forms and Number Theory

*[postponed]*at 3:35p.m. in VinH 311 (364?)

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

#### Cockburn's Seminar

*Approximating Functions with Singularities*at 3:35p.m. in 213 Vincent Hall

Title: Approximating Functions with Singularities

### Tuesday, 25 October 2016

#### Climate Seminar

*Climate Change Seminar*at 11:15a.m. in VinH 570

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

#### Differential Geometry / Symplectic Topology Seminar

*Differential Geometry and Symplectic Topology seminar*at 1:25p.m. in Vinh 570

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

#### IMA Data Science Lab Seminar

*Diana Negoescu: Differentiated HIV Viral Load Monitoring in Resource Limited Settings: An Economic Analysis*at 1:25p.m. in Lind 305

**Diana Negoescu**(

*University of Minnesota, Twin Cities*)

Viral load (VL) monitoring for patients receiving antiretroviral therapy (ART) is recommended worldwide. However, the costs of frequent monitoring are a barrier to implementation in ...
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Please send an email to lerman@umn.edu for more information.

#### Ordway Lecture Series

*On ancient solutions of the Navier-Stokes equations III*at 2:30p.m. in VinH 570

**Professor Gregory Seregin**(

*Ordway Lecturer*)

### Wednesday, 26 October 2016

#### IMA Annual Program

*Maxence Cassier: Spectral Theory and Limiting Amplitude Principle for Maxwell’s Equations at the Interface of a Metamaterial*at 11:00a.m. in Lind 305

**Maxence Cassier**(

*The University of Utah*)

In this talk, we are interesting in a transmission problem between a dielectric and a metamaterial. The question we consider is the following: does the ...
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#### Student PDE Seminar

*Hamiltonian systems and KAM theory*at 11:10a.m. in Vincent Hall 20

**Dario Valdebenito**

The Kolmogorov-Arnold-Moser (KAM) theory is an important tool to obtain quasiperiodic solutions for Hamiltonian systems. In this talk I will introduce basic concepts of Hamiltonian ...
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#### Algebraic Geometry

*Algebraic Geometry Seminar*at 2:30p.m. in VinH 113

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

#### PDE Seminar

*The influence of a line of fast diffusion on KPP propagation: nonlocal exchanges*at 3:30p.m. in VinH 113

**Antoine Pauthier**

The purpose of this talk is to present some results concerning the effects of nonlocal exchanges between a line of fast diffusion and a two-dimensional ...
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Please send an email to capop@umn.edu for more information.

### Thursday, 27 October 2016

#### IMA Annual Program

*Junshan Lin: Scattering and Field Enhancement of Subwavelength Slits*at 11:00a.m. in Lind 305

**Junshan Lin**(

*Auburn University*)

Subwavelength apertures and holes on surfaces of metals induce strong electromagnetic field enhancement and extraordinary optical transmission. This remarkable phenomenon can lead to potentially significant ...
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#### Geometric Analysis Learning Seminar

*Geometry of Gradient Shrinking Ricci solitons (II)*at 11:10a.m. in VinH 570

**Dekai Zhang**

Please send an email to hexxx221@umn.edu for more information.

#### Commutative Algebra Seminar

*The Local Cohomology of FI-modules*at 11:15a.m. in Vincent Hall 203 A

**Eric Ramos**(

*Wisconsin*)

Much of the work in homological invariants of FI-modules has been concerned with properties of certain right exact functors. One reason for this is that ...
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Please send an email to cbekesc@math.umn.edu for more information.

#### Math Club Seminar

*Math Club*at 12:20p.m. in VinH 570

Please send an email to mathclub.umn@gmail.com for more information.

#### Math Physics Seminar

*Math Physics Seminar*at 12:20p.m. in Vincent Hall 215

Please send an email to karl0163@umn.edu for more information.

#### Differential Geometry / Symplectic Topology Seminar

*Foliations of Contact Manifolds by Planar Pseudoholomorphic Curves and the Weinstein Conjecture*at 1:25p.m. in Vinh 570

**Bahar Acu**(

*University of Southern California*)

In this talk, we will describe foliations of high dimensional “iterated planar" contact manifolds by pseudoholomorphic curves and show that, by using this kind of ...
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Please send an email to lixxx248@umn.edu for more information.

#### SIAM Student Reading Group Seminar

#### Colloquium

*Feynman Categories: Definition and Applications*at 3:30p.m. in Vincent Hall 16

**Ralph Kaufmann**(

*Purdue University, West Lafayette*)

Feynman categories are a novel framework generalizing groups, algebras, substitution schemes, etc. as they appear in geometry, topology, number theory and mathematical physics. We start ...
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Please send an email to cad@umn.edu for more information.

#### Student Combinatorics Seminar

*Student Combinatorics Seminar*at 4:40p.m. in VinH 213

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

### Friday, 28 October 2016

#### IMA Data Science Lab Seminar

*Arya Mazumdar: Clustering with an Oracle*at 11:15a.m. in Lind 305

**Arya Mazumdar**(

*University of Massachusetts*)

Given a set V of n elements, consider the simple task of clustering them into k clusters, where k is unknown. We are allowed to ...
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Please send an email to lerman@umn.edu for more information.

#### IMA Industrial Problems Seminar

*William Satzer: Desirable Characteristics of a Mathematician in Industry: One Person's View*at 1:25p.m. in Lind 305

**William Satzer**(

*3M*)

I'll discuss attributes of mathematics Ph.D.s that make them attractive to an employer in industry, as well as some obstacles that mathematics Ph.D.s face. Bill ...
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#### Probability Seminar

*Extended Extremal Process and Friends in Branching Brownian Motion*at 2:30p.m. in VinH 207

**Lisa Hartung**(

*NYU*)

Branching Brownian motion (BBM) is a classical process in probability, describing a population of particles performing independent Brownian motion and branching according to a Galton ...
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Please send an email to arnab@umn.edu for more information.

#### Applied and Computational Math Colloquium

*Mixed Methods for Two-Phase Darcy-Stokes Mixtures of Partially Melted Materials with Regions of Zero Porosity*at 2:30p.m. in Vincent Hall 2

**Todd Arbogast (joint with Marc A. Hesse and Abraham L. Taicher)**(

*University of Texas*)

The Earth's mantle (or, e.g., a glacier) involves a deformable solid matrix phase within which a second phase, a fluid, may form due to melting ...
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Please send an email to jyfoo@umn.edu for more information.

#### Lie Theory Seminar

*Lie Theory Seminar*at 3:30p.m. in Vincent Hall 301

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

#### Combinatorics Seminar

*Combinatorics Seminar*at 3:35p.m. in Vinh 570

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

#### MCFAM Seminar

*MCFAM Seminar - No Seminar*at 5:30p.m. in Vincent Hall 16

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