Matematiikan ja systeemianalyysin laitos

Ajankohtaista

Esitelmiä, seminaareja ja väitöksiä

* Seuraavan viikon tapahtumat merkitty tähdellä

Dr. Augustin Lafay (Aalto University)
TBA
* Tuesday 28 October 2025,   10:15,   M3 (M234)

Henri Lahdelma
Weakly porous sets in elliptic and parabolic cases
* Wednesday 29 October 2025,   10:15,   M3 (M234)
Seminar on analysis and geometry

Prof. Gerardo Barrera (Instituto Superior Técnico Lisboa)
Asymptotic Behavior of the Condition Number of Random Circulant Matrices
* Wednesday 29 October 2025,   14:15,   M2 (M233)
We analyze the asymptotic distribution of the extremal singular values of random circulant matrices generated by sequences of independent and identically distributed random variables satisfying the Lyapunov condition. Under an appropriate normalization, we establish that, as the matrix dimension tends to infinity, the joint distribution of the largest and smallest singular values converges in distribution to the independent product of Rayleigh and Gumbel laws. This result directly implies that a suitably normalized condition number of such matrices converges in distribution to a Fréchet law in the large-dimensional limit. The condition number serves as a quantitative measure of the sensitivity of linear systems to infinitesimal perturbations of the input. The proof relies on the classical coupling method of Einmahl-Komlós-Major-Tusnády to achieve precise probabilistic control over the spectral extremes. This is a joint contribution with Paulo Manrique (Extremes, 2022).
Stochastics Seminar

Dr. Alexis Langlois-Rémillard (Universität Bonn)
TBA
Tuesday 04 November 2025,   10:15,   M3 (M234)

Erno Vihanto
TBA (MSc thesis presentation)
Wednesday 05 November 2025,   10:15,   M3 (M234)
Seminar on analysis and geometry

Dr. Francesca Arrigo (University of Strathclyde)
Katz centrality... Just a one-trick pony?
Tuesday 11 November 2025,   15:15,   U3 (U141)
Further information
Complex networks are ubiquitous in our daily lives. Frequently, practitioners are interested in identifying the most important, or central, entities within the network. This goal can be achieved using centrality measures, which are functions that assign nonnegative scores to the entities in order to quantify their importance. There are several (families of) centrality measures in the literature, and in this talk I will focus on a specific one; Katz centrality. This centrality was introduced in the 1950s to measure the relative influence of an actor within a social network. Since its introduction, Katz centrality has been adapted to handle various types of graphs and relations, and I will cover some of these after a smooth introduction to networks, walk-based centrality measures, and the original Katz centrality. The goal of my talk is to help you decide for yourself  whether the question in the title should be answered positively.

Ryan O’Loughlin (University of Reading)
TBA
Wednesday 12 November 2025,   15:52,   M3 (M234)
The speaker is a guest of Jani Virtanen (UEF); his visit to Aalto is coordinated by Tuomas Hytönen.
Analysis seminar

Leah Schätzler
TBA
Wednesday 26 November 2025,   10:15,   M3 (M234)
Seminar on analysis and geometry

Prof. Tuomas Hytönen (Aalto University)
TBA
Tuesday 09 December 2025,   15:15,   M1 (M232)
TBA

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