* Dates within the next 7 days are marked by a star.
Lorenzo Zacchini (Aalto University)
A Dyadic Approach to Schatten Estimates for Commutators of Fractional Integrals (midterm review)
* Wednesday 23 September 2026, 10:15, M3 (M234)
Analysis seminar / Hytönen
Jani Onninen (Syracuse University)
Continuity of Mappings Satisfying a Distortion Inequality with Defect
* Wednesday 23 September 2026, 11:15, M3 (M234)
We study the continuity problem for Sobolev mappings $f \in W^{1,n}(\Omega,\mathbb R^n)$ satisfying the distortion inequality with defect
\[
|Df(x)|^n \le K(x)\det Df(x)+\Sigma(x),
\]
where $K \ge 1$ and $\Sigma \ge 0$ are measurable functions. In a recent joint work with Ilmari Kangasniemi, we closed a substantial gap between existing techniques for proving continuity and known counterexamples. This also initiated a systematic study of mappings with values of finite distortion. We will additionally discuss analogues of the continuity result for mappings into closed manifolds.
Analysis seminar
Juho Korkeala
Exotic mean oscillation and compactness of commutators (Master thesis presentation)
* Thursday 24 September 2026, 10:15, M3 (M234)
Analysis seminar (extra meeting) / Hytönen
Janne Junnila (Univ. Jyväskylä)
In search for practical autoformalization workflows for working mathematicians
* Friday 25 September 2026, 13:15, U4062, University of Helsinki main building (Fabianinkatu 33)
I will present a personal account of my own autoformalization experiments in complex analysis and related areas. This will include a demo of Handwave, which is a tool intended to help in planning, building, organizing and presenting autoformalized Lean projects.
Aalto-Helsinki formalized mathematics seminar
Prof. Marcus Greferath (University College Dublin/Aalto)
On my Recent Work on Noiseless and Noisy Group Testing (Part I)
Thursday 01 October 2026, 14:15, M3 (M234)
Group testing is a branch of the mathematics of communications and coding theory that is almost as old as Shannon's information theory itself. It arose from the need to screen populations of potentially infected individuals for an infectious disease with as few tests as possible, since testing was expensive or otherwise cumbersome. Current developments in the field assume that tests may be considerably cheaper but are often affected by false positives and false negatives. This reopens the line of research known as error-correcting group testing. In this talk, we revisit several old and new ideas in the language of residuation theory and show how this framework mitigates some of the awkwardness of earlier approaches to modelling the problem. We conclude the presentation with results on the error tolerance and test efficiency of various examples of error-correcting group testing schemes based on finite geometries, partial linear spaces, and other appealing combinatorial designs.
Remark: This talk is dedicated to my late wife, Cornelia Roessing, who encouraged me to take up this awarding field within the mathematics of communications. It includes joint work with Oliver Gnilke (Aalborg), Johan Dinesen (Aalto), and David Forbes (UCD).
ANTA Seminar / Hollanti et al.
Vanni Noferini (Aalto)
TBA
Monday 05 October 2026, 14:15, M3 (M234)
TBA
AGC Seminar
Aleksis Koski
TBA
Wednesday 07 October 2026, 10:15, M3 (M234)
Analysis seminar
Prof. Lenny Fukshansky (Claremont McKenna College)
TBA
Thursday 15 October 2026, 14:15, M3 (M234)
ANTA Seminar / Hollanti et al.
Ragnar Freij-Hollanti (Aalto)
TBA
Monday 19 October 2026, 14:15, M3 (M234)
TBA
AGC Seminar
Henri Lahdelma
Midterm review talk
Wednesday 21 October 2026, 10:15, M3 (M234)
Analysis seminar
Wontae Kim (Korea Institute for Advanced Study)
TBA
Wednesday 04 November 2026, 10:15, M3 (M234)
Analysis seminar
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