# Lectures, seminars and dissertations

* Dates within the next 7 days are marked by a star.

Johan Wästlund (Chalmers University of Technology)

**Optimization Through Games**

*** ** Tuesday 28 March 2017, 10:15, M237

Further information

I will discuss a couple of different methods for analyzing optimization problems on large random structures. In particular I will show how some results can be derived by inventing two-person games whose optimal strategies encode the solution to problems like minimum weight matching on weighted graphs.

AScI Large Structures Seminar / Freij-Hollanti, Kubjas

Christian Haase (Freie Universität Berlin)

**Finiteness Theorems for Lattice Polytopes**

*** ** Tuesday 28 March 2017, 15:15, M1 (M232)

A lattice polytope is the convex hull of finitely many points all whose coordinates are integers. These fundamental geometric objects appear in a variety of mathematical fields like combinatorics or algebraic and symplectic geometry, with applications ranging from optimization to statistics to mathematical physics in string theory.
Considerable effort has gone into several classification projects for classes of lattice polytopes. All these classifications are based on theorems, stating that the class under consideration has only finitely many elements, or at least that certain parameters are bounded in the class.
In this talk, I will give an overview of my favorite finiteness theorems, starting in the 19th century with Pick and Minkowski and ending with recent developments to be published in 2017+.

Colloquium of Mathematics and Systems Analysis

Matthew Romney (University of Illinois)

** Existence of quasiconformal parametrizations of metric surfaces with improved dilatation**

*** ** Wednesday 29 March 2017, 12:15, M3 (M234)

The measurable Riemann mapping theorem is the fundamental existence theorem for homeomorphic solutions to the Beltrami equation in the plane, i.e. quasiconformal mappings, and shows the flexibility of such mappings. More particularly, it gives hope for a positive answer to this question: given a metric space (X,d) quasiconformally homeomorphic to a simply connected domain in the complex plane, can one find a quasiconformal mapping from X onto the same domain which improves the dilatation to within a fixed universal bound? If so, what it the sharp value? This talk will discuss a solution of this problem.

Seminar on analysis and geometry

Matias Vestberg

**Up to Your Neck in Shallow Water**

*** ** Friday 31 March 2017, 14:15, M3 (M234)

We take a plunge into the world of shallow water dynamics as described by the diffusive wave approximation. This nonlinear parabolic PDE is studied using De Giorgi and Moser type iteration techniques to obtain local boundedness of weak solutions. We also present fundamental solutions in the flat case and make some remarks regarding the existence of solutions.

Harmonic analysis and PDE seminar

Christopher Hopper

**TBA**

Friday 07 April 2017, 14:15, M3 (M234)

Harmonic analysis and PDE seminar

Ville Tengvall (University of Jyväskylä)

**TBA**

Wednesday 12 April 2017, 12:15, M3 (M234)

Seminar on analysis and geometry

Prof. Thomas Britz

**A Nice Proof of Wei's Duality Theorem**

Wednesday 12 April 2017, 15:15, M3 (M234)

The Tutte polynomial was once an esoteric object known only to the then small community
of combinatorialists. That changed when Greene (1976) pointed out the connection between
this polynomial and weight enumerators, and how that connection provided a beautifully simple
proof of the MacWilliams Identity (MacWilliams 1963) of coding theory fame. The Tutte polynomial
is now of wide interest and appeal to the broader mathematical community who have found
it lurking disguised in numerous areas of mathematics. Despite its present prominence, few are
aware of how the Tutte polynomial provides another beautifully simple proof of a second celebrated
duality theorem from coding theory, namely Weis Duality Theorem (Wei 1991). This proof, due to
Duursma (2004), deserves better exposure, so this talk will present Duursmas proof.

ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Prof. Samuli Siltanen (University of Helsinki)

**Electrical impedance tomography imaging via the Radon transform**

Wednesday 19 April 2017, 12:15, M3 (M234)

Seminar on analysis and geometry

Casimir Lindfors

**TBA**

Friday 21 April 2017, 14:15, M3 (M234)

Harmonic analysis and PDE seminar

Thomas Britz (UNSW Sydney)

**A Nice Proof of Wei's Duality Theorem**

Tuesday 25 April 2017, 15:15, M1 (M232)

The Tutte polynomial was once an esoteric object known only to the then small community of combinatorialists. That changed when Greene (1976) pointed out the connection between this polynomial and weight enumerators, and how that connection provided a beautifully simple proof of the MacWilliams Identity (MacWilliams 1963) of coding theory fame. The Tutte polynomial is now of wide interest and appeal to the broader mathematical community who have found it lurking disguised in numerous areas of mathematics. Despite its present prominence, few are aware of how the Tutte polynomial provides another beautifully simple proof of a second celebrated duality theorem from coding theory, namely Weis Duality Theorem (Wei 1991). This proof, due to Duursma (2004), deserves better exposure, so this talk will present Duursmas proof.

Colloquium of Mathematics and Systems Analysis

Stavros Evdoridis (Aalto)

**TBA**

Wednesday 26 April 2017, 12:15, M3 (M234)

Seminar on analysis and geometry

Prof. Harri Ehtamo (Aalto)

**Evoluutiopelit evakuointimalleissa - Pelastettavien kovan leikin peliteoreettinen kuvaus**

Wednesday 26 April 2017, 15:00, U8

LUMA-luennot lukiolaisille / Kangaslampi

Dr. David Cushing (Durham)

**TBA**

Wednesday 26 April 2017, 15:15, M3 (M234)

ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Pekka Lehtelä

**TBA**

Friday 28 April 2017, 14:15, M3 (M234)

Harmonic analysis and PDE seminar

Thomas Westerbäck

**TBA**

Wednesday 10 May 2017, 15:15, M3 (M234)

ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Prof. Daina Taimina (Cornell University)

** Study mathematics and ... become an artist?**

Tuesday 16 May 2017, 15:00, C-hall (Y205)

When I was in middle school I was a good student and had very good grades in all subjects...except in art class where I was struggling to draw the way my teacher thought was the right way. I accepted my teacher's judgement that I can do anything but art and went to study mathematics. Could I imagine that some fifty years later I will be known as an artist? Mathematics and art are not too distant. In my talk, I will discuss the interplay between mathematics and art from my own perspective.

Joint Mathematics and Arts and Women in Mathematics Colloquium / Kirsi Peltonen

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