* Seuraavan viikon tapahtumat merkitty tähdellä
Lilja Metsälampi (Aalto)
Geometry of low nonnegative rank matrix completion
* Monday 23 March 2026, 14:15, M134
In this talk, we study the completion problem for partial matrices with nonnegative entries: when can they be completed to matrices of nonnegative rank at most r? Most of our results are for r <= 3. In the first part of the talk, we consider which results from low rank matrix completion can be extended to the low nonnegative rank case. In particular, we show how nonnegative rank-1 and nonnegative rank-2 completions are related to rank-1 and rank-2 completions, respectively. In the second part, we introduce a geometric framework for low nonnegative-rank matrix completion, based on the well-known characterization of nonnegative rank via nested polytopes. This perspective yields preliminary results for nonnegative rank-3 completions. In particular, we give examples of partial matrices that admit rank-3 completions with nonnegative entries but have no nonnegative-rank-3 completions.
AGC Seminar
Petteri Kaski (Aalto)
Algebraic complexity of tensors with three or more modes
Monday 30 March 2026, 14:15, M134
The algebraic complexity of bilinear maps and trilinear forms has been studied extensively, most notably in the context of complexity of matrix multiplication; for three-mode tensors, it is known that asymptotic circuit complexity and asymptotic rank coincide, but for tensors with more than three modes this asymptotic correspondence in general breaks down. This talk develops the basic correspondence for three modes as well as looks at recent work towards understanding the complexity of tensors with more than three modes. Based in part on joint work with Cornelius Brand, Radu Curticapean, Baitian Li, Ian Orzel, Tim Seppelt, and Jiaheng Wang (cf. https://arxiv.org/abs/2602.11975 ).
AGC Seminar
Jaakko Olkkonen (Aalto)
Computational modelling of light transport in optical imaging (Mid-term review)
Wednesday 01 April 2026, 10:00, M3 (M234)
Numerical Analysis seminar
Philémon Bordereau (EPFL)
TBA
Tuesday 07 April 2026, 10:15, M3 (M234)
Milo Orlich
What is a Cohen-Macaulay ring?
Monday 13 April 2026, 14:15, M3 (M234)
TBA
AGC Seminar
Ian Välimaa (Aalto University)
TBA
Tuesday 14 April 2026, 10:15, M3 (M234)
Miika Rankaviita (Aalto)
Midterm review: TBA
Monday 20 April 2026, 14:15, M3 (M234)
TBA
AGC Seminar
Akseli Jussinmäki
TBA (Mid-term review)
Wednesday 22 April 2026, 10:15, M3 (M234)
Seminar on analysis and geometry
MSc Ian Välimaa (Aalto)
Mid-term review
Monday 27 April 2026, 15:15, Y405
Aalto Stochastics & Statistics Seminar / Leskelä
Matematiikan kandiseminaari (Bachelor thesis seminar in Math.)
Friday 08 May 2026, 09:00, TBA
Further information
Ohjelma: https://mycourses.aalto.fi/course/view.php?id=34597#module-908887
Zofia Grochulska
TBA
Wednesday 13 May 2026, 10:15, M3 (M234)
Seminar on analysis and geometry / Korte
Prof. Iván Blanco Chacón (U. Alcalá)
Summer School on Heegner Points and the Gross-Zagier Formula
Monday 01 June 2026, 10:00, U5 (U147)
The summer school will take place June 1-5. A webpage link will be added here once up. Registration is mandatory but free of charge. Pre-requisites: a course on algebraic number theory and some basics on elliptic curves. Organizers: Iván Blanco, Matilde Costa, Antti Haavikko, and the ANTA group.
ANTA Seminar / Hollanti et al.
Matematiikan kandiseminaari (Bachelor thesis seminar in Math.)
Monday 15 June 2026, 09:00, TBA
Further information
Ohjelma: https://mycourses.aalto.fi/course/view.php?id=34597#module-908887
Prof. Timothy Trudgian (UNSW Canberra)
TBA
Thursday 09 July 2026, 15:15, M3 (M234)
ANTA Seminar / Hollanti et al.
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