Matematiikan ja systeemianalyysin laitos

Ajankohtaista

Esitelmiä, seminaareja ja väitöksiä

* Seuraavan viikon tapahtumat merkitty tähdellä

Asadollah Aghajani
Regularity of stable solutions to elliptic PDEs and Gelfand-type problems II
* Today * Wednesday 01 February 2023,   12:15,   M3 (M234)
Seminar on analysis and geometry

Rahinatou Yuh Njah
Ring/Polynomial learning with errors (RLWE/PLWE): Equivalence and attacks
* Today * Wednesday 01 February 2023,   16:15,   M3 (M234)
ANTA Seminar

Petri Laarne (University of Helsinki)
Almost sure solution of nonlinear wave equation: from donut to plane
* Tuesday 07 February 2023,   10:15,   M2 (M233)
I discuss the recent preprint [arXiv:2211.16111] of Nikolay Barashkov and I, where we show the almost sure well-posedness of a deterministic nonlinear wave equation (cubic Klein-Gordon equation) on the plane. Here "almost sur" is in respect to the \\\\phi^4 quantum field theory. I briefly introduce the invariant measure argument and outline the solution on 2D torus due to Oh and Thomann. I then explain our main contributions: extension of periodic solutions to infinite volume, and a weaker result for nonlinear Schrödinger equation. The viewpoint is functional-analytic with a dash of probability.
Aalto mathematical physics seminar (Kytölä, Peltola, Sahlsten)

Wontae Kim
TBA
Wednesday 08 February 2023,   12:15,   M3 (M234)
Seminar on analysis and geometry

Prof. William Mance, University of Adam Mickiewicz in Poznan
Normal numbers
Wednesday 08 February 2023,   16:15,   M3 (M234)
Informally, a real number is normal in base b if in its b-ary expansion all digits and blocks of digits occur as often as one would expect them to uniformly at random. Borel introduced normal numbers in 1909 and proved that Lebesgue-almost every real number is normal in all bases b \geq 2. Even though this shows that, in some sense, normal numbers are "typical," no example of a number normal in all bases was given until 1939 by Turing. In the last 100 years, the study of normal numbers has spread over a wide breadth of seemingly unrelated disciplines. Normality is closely related to number theory, ergodic theory, theoretical computer science, probability theory, fractal geometry, descriptive set theory, and others areas of math. We will explore the basic properties of normal numbers and surprising connections they have, depending on the interest of the audience.
ANTA Seminar

Prof. Anita Schöbel (RPTU Kaiserslautern and Fraunhofer ITWM)
Robust multi-objective optimization
Tuesday 14 February 2023,   15:15,   U6 (U149)
Most real-world optimization problems contain parameters which are not known at the time a decision is to be made. In robust optimization one specifies the uncertainty in a scenario set and tries to hedge against the worst case. Classical robust optimization aims at finding a solution which is best in the worst-case scenario. It is a well-studied concept but it is known to be very conservative: A robust solution comes with a high price in its nominal objective function value. This motivated researchers to introduce less conservative robustness concepts in the last decade. Moreover, many real-world problems involve not only one, but multiple criteria. While robust single-objective optimization has been investigated for 25 years, robust multi-objective optimization is a new field in which already the definition of "robust" is a challenge. In the talk, several robustness concepts will be discussed and illustrated at applications from public transport.

Panu Lahti (Chinese Academy of Sciences)
TBA
Wednesday 22 February 2023,   12:15,   M3 (M234)
Seminar on analysis and geometry

Systeemitieteiden kandidaattiseminaari / Bachelor seminar in systems analysis
Monday 06 March 2023,   09:30,   Riihi (Y225a)
Further information

Stephen Moore (Institute of Mathematics Polish Academy of Sciences)
TBA
Tuesday 07 March 2023,   10:15,   M2 (M233)
Aalto mathematical physics seminar (Kytölä, Peltola, Sahlsten)

Ethan Sussman (MIT)
TBA
Tuesday 07 March 2023,   11:15,   M2 (M233)
Aalto mathematical physics seminar (Kytölä, Peltola, Sahlsten)

Ethan Sussman (MIT)
TBA
Tuesday 14 March 2023,   10:15,   M2 (M233)
Aalto mathematical physics seminar (Kytölä, Peltola, Sahlsten)

Dr. David Karpuk, WithSecure
Recent progress in secure distributed computation
Wednesday 15 March 2023,   16:15,   M3 (M234)
ANTA Seminar

Peter Kristel (Bonn)
TBA
Tuesday 11 April 2023,   10:15,   M2 (M233)
Aalto mathematical physics seminar (Kytölä, Peltola, Sahlsten)

Systeemitieteiden kandidaattiseminaari / Bachelor seminar in systems analysis
Monday 17 April 2023,   09:30,   Riihi (Y225a)
Further information

Systeemitieteiden kandidaattiseminaari / Bachelor seminar in systems analysis
Tuesday 16 May 2023,   09:30,   Riihi (Y225a)
Further information

Systeemitieteiden kandidaattiseminaari / Bachelor seminar in systems analysis
Friday 16 June 2023,   09:30,   Riihi (Y225a)
Further information

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