Department of Mathematics and Systems Analysis

Current

Lectures, seminars and dissertations

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

Eero Saksman (University of Helsinki)
The Riemann zeta function meets Gaussian multiplicative chaos
* Tuesday 28 February 2017,   15:15,   M1 (M232)
We begin by recalling some basic properties of the Riemann zeta function and its relevance to number theory. Later on we describe it's chaotic nature on the critical strip. The final theme to be discussed is the functional statistics of the zeta function on the critical line. The last mentioned topic is based on joint work with Christian Webb (Aalto).
Colloquium of Mathematics and Systems Analysis

Clifford Gilmore (University of Helsinki)
Growth rates of frequently hypercyclic harmonic functions
* Wednesday 01 March 2017,   12:15,   M3 (M234)
The notion of frequent hypercyclicity stems from ergodic theory and has been an active area of research since it was introduced by Bayart and Grivaux (2004). Many natural bounded linear operators are frequently hypercyclic, for instance the differentiation operator on the space of entire functions. We will begin by recalling some basic examples and the pertinent notions of frequent hypercyclicity. We then consider the partial differentiation operator acting on the space of harmonic functions on R^n. Our primary goal is to identify sharp growth rates, in terms of the L^2-norm, of harmonic functions that are frequently hypercyclic vectors for the basic partial differentiation operator. This answers a question posed by Blasco et al. (2010). This is joint work with Eero Saksman and Hans-Olav Tylli.
Seminar on analysis and geometry

Amaro Barreal
Lattices for physical layer network coding
Tuesday 07 March 2017,   10:15,   M205
Doctoral student talk / Engström

Lauri Perkkiö
Differential material parameter in finite element analysis
Tuesday 07 March 2017,   10:40,   M205
Doctoral student talk / Engström

Ferdinand Blomqvist
The closest vector problem in high dimension
Tuesday 07 March 2017,   15:15,   M203
Doctoral student talk / Engström

Antti Ojalammi
On exterior acoustics and speech modelling
Tuesday 07 March 2017,   15:40,   M203
Doctoral student talk / Engström

Tiina Vesanen
Numerical aspects of multicentric calculus
Tuesday 07 March 2017,   16:15,   M203
Doctoral student talk / Engström

Diana Apetrei
Advances in multicentric calculus
Tuesday 07 March 2017,   16:40,   M203
Doctoral student talk / Engström

Juha Kuortti
Spectral characteristics of the vocal tract
Wednesday 08 March 2017,   14:40,   M205
Doctoral student talk / Engström

Prof. Kaie Kubjas (Aalto)
Matrices, photos and Netflix
Wednesday 08 March 2017,   15:00,   TU1
LUMA-luennot lukiolaisille / Kangaslampi

Vesa Kaarnioja
On the structure and eigenvalues of lattice-theoretic tensors
Wednesday 08 March 2017,   15:15,   M205
Doctoral student talk / Engström

Anna-Lena Horlemann-Trautmann
Symbol Erasures in Random Network Coding
Wednesday 08 March 2017,   15:15,   M3 (M234)
In random network coding we want to communicate over a noisy network channel with one sender and several receivers, where all receivers want to get the same information from the sender. We encode the data before sending it through the network, so the receivers can reconstruct the original data from the corrupted data. From a mathematical point of view, classical tools used in this context are projective spaces over finite fields. In this talk we will give an introduction to random network coding and explain how the classical model by Kötter and Kschischang treats erasures during the communication. Then we give an alternative model and show that, depending on the network topology, the classical or the alternative model can be advantageous for erasure correction.
ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Lauri Mustonen
Surrogate models and computational inverse problems
Wednesday 08 March 2017,   15:40,   M205
Doctoral student talk / Engström

Mikael Laaksonen
Spectral inverse iteration for stochastic eigenvalue problems
Wednesday 08 March 2017,   16:15,   M205
Doctoral student talk / Engström

Tom Gustafsson
Numerical methods for lubrication and elastic contact
Wednesday 08 March 2017,   16:40,   M205
Doctoral student talk / Engström

Mikko Harju
Spatial decision analysis with incomplete information
Thursday 09 March 2017,   10:15,   M205
Doctoral student talk / Engström

Pekka Laitila
Facilitating expert elicitation of probabilities for Bayesian networks
Thursday 09 March 2017,   10:40,   M205
Doctoral student talk / Engström

Heikki Puustinen
Network optimization and simulation in military air mission planning
Thursday 09 March 2017,   11:15,   M205
Doctoral student talk / Engström

Anton von Schantz
Modeling crowd dynamics in an evacuation as a multiagent system
Thursday 09 March 2017,   11:40,   M205
Doctoral student talk / Engström

Yrjänä Hynninen
Mathematical methods for medical decision making
Thursday 09 March 2017,   13:15,   M3 (M234)
Doctoral student talk / Engström

Juho Andelmin
Solving the green vehicle routing problem and allocating resources based on efficiency analysis
Thursday 09 March 2017,   13:40,   M3 (M234)
Doctoral student talk / Engström

Armando Gutiérrez
The horoboundary of metric spaces and its role in dynamics
Thursday 09 March 2017,   14:15,   M3 (M234)
Doctoral student talk / Engström

Hoa Ngo
Information spreading in large networks
Thursday 09 March 2017,   14:40,   M3 (M234)
Doctoral student talk / Engström

Pekka Lehtelä
Generalized solutions to the porous medium equation
Thursday 09 March 2017,   15:15,   M3 (M234)
Doctoral student talk / Engström

Casimir Lindfors
Regularity for nonlinear parabolic PDEs with general growth
Thursday 09 March 2017,   15:40,   M3 (M234)
Doctoral student talk / Engström

Jonas Tölle
The p-Laplace evolution equation as p tends to 1: Mosco convergence and convergence of solutions
Friday 10 March 2017,   14:15,   M3 (M234)
Harmonic analysis and PDE seminar

Eero Ruosteenoja (University of Jyväskylä)
TBA
Wednesday 15 March 2017,   12:15,   M3 (M234)
Seminar on analysis and geometry

Taoufiq Damir
TBD
Wednesday 15 March 2017,   15:15,   M3 (M234)
ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Prof. Henry Segerman (Oklahoma State University)
"Design of 3D printed mathematical art"
Wednesday 15 March 2017,   16:00,   B-Hall
When visualising topological objects via 3D printing, we need a three-dimensional geometric representation of the object. There are approximately three broad strategies for doing this: "Manual" - using whatever design software is available to build the object by hand; "Parametric/Implicit" - generating the desired geometry using a parametrisation or implicit description of the object; and "Iterative" - numerically solving an optimisation problem. The manual strategy is unlikely to produce good results unless the subject is very simple. In general, if there is a reasonably canonical geometric structure on the topological object, then we hope to be able to produce a parametrisation of it. However, in many cases this seems to be impossible and some form of iterative method is the best we can do. I will discuss these matters with many examples, including visualisation of four-dimensional polytopes (using orthogonal versus stereographic projection) and Seifert surfaces (comparing my work with Saul Schleimer with Jack van Wijk's iterative techniques). I will also describe some computational problems that have come up in my 3D printed work, including the design of 3D printed mobiles (joint work with Marco Mahler), "Triple gear" and a visualisation of the Klein Quartic (joint work with Saul Schleimer), and hinged surfaces with negative curvature (joint work with Geoffrey Irving).
Mathematics and Arts Colloquium / Kirsi Peltonen

Estibalitz Durand Cartagena (UNED, Spain)
TBA
Friday 17 March 2017,   15:00,   M3 (M234)
Harmonic analysis and PDE seminar

Mikko Stenlund (University of Helsinki)
TBA
Wednesday 22 March 2017,   12:15,   M3 (M234)
Seminar on analysis and geometry

Matthias Grezet
TBD
Wednesday 22 March 2017,   15:15,   M3 (M234)
ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

Matthew Romney (University of Illinois)
TBA
Wednesday 29 March 2017,   12:15,   M3 (M234)
Seminar on analysis and geometry

Matias Vestberg
TBA
Friday 31 March 2017,   14:15,   M3 (M234)
Harmonic analysis and PDE seminar

Thomas Westerbäck
TBD
Wednesday 05 April 2017,   15:15,   M2 (M233)
ANTA Seminar: Algebra, Number Theory, and Applications to Communications and Computing / Karpuk, Kaski, Hollanti, Greferath

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

Thomas Britz
TBD
Wednesday 12 April 2017,   15:15,   M3 (M234)
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

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

Pekka Lehtelä
TBA
Friday 28 April 2017,   14:15,   M3 (M234)
Harmonic analysis and PDE seminar

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