Weekly Bulletin
The FIM provides a Newsletter called FIM Weekly Bulletin, which is a selection of the mathematics seminars and lectures taking place at ETH Zurich and at the University of Zurich. It is sent by e-mail every Tuesday during the semester, or can be accessed here on this website at any time.
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Monday, 29 April | |||
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Time | Speaker | Title | Location |
13:15 - 15:00 |
Shahar Mendelson The Australian National University |
HG G 43 |
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16:15 - 17:15 |
Emmanuel Abbé EPFL |
Abstract
On the conjecture of achieving Shannon capacity with Reed-Muller codes (CANCELLED) |
HG F 5 |
Tuesday, 30 April | |||
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Time | Speaker | Title | Location |
13:15 - 14:45 |
Dr. Alberto Merici University of Milan |
Abstract
We prove that (logarithmic, Nygaard completed) prismatic and (logarithmic) syntomic cohomologies are representable in the category of logarithmic motives. As an application, we immediately obtain Gysin maps for prismatic and syntomic cohomologies, and we precisely identify their cofibers. In the second part of the talk we develop a descent technique that we call saturated descent, inspired by the work of Niziol on log K-theory. Using this, we prove crystalline comparison theorems for log prismatic cohomology, log Segal conjectures and log analogues of the Breuil-Kisin prismatic cohomology, from which we get Gysin maps for the A_{inf} cohomology.
Oberseminar: Algebraische GeometrieLog prismatic cohomology, motivic spectra and comparison theoremsread_more |
Y27 H 25 |
15:15 - 16:15 |
Prof. Dr. Yi Zhang Academy of Mathematics and System Science, Beijing |
Abstract
The notion of a John domain was initially introduced in 1961 by Fritz John, and later named after him by Martio and Sarvas. Typically, its study is motivated by its connections to the properties of quasiconformal and quasisymmetric mappings. Moreover, John domains find extensive applications in the theory of Sobolev functions in metric measure spaces and functional analysis, as they represent essentially the sole class of domains that uphold the Sobolev-Poincaré inequality. In this presentation, I will introduce several recent applications of John domains in the theory of the calculus of variations.
Analysis SeminarJohn domains in variational problemsread_more |
HG G 43 |
16:30 - 17:30 |
Konstantin Andritsch ETHZ |
Abstract
''As the term suggests - Adelic torus orbits - are nothing but the orbit of an algebraic torus over the ring of Adeles. They provide a powerful tool to collectively study the behavior of collections of geometric data given by arithmetic data. In this talk we will motivate the use of adelic torus orbits by looking at a concrete example: > Already in the 19th century Gauss studied integral binary quadratic forms. He observed that there are essentially only finitely many different integral binary quadratic forms with fixed discriminant. In more modern terms, these different forms arise through a natural action of the ideal class group of a quadratic number field. To study the properties of different forms at the same time it is convenient to consider the Adelic extension of the modular curve. We will see that forms who are not equivalent over the integers might be equivalent over the Adeles. After introducing the necessary concepts and motivating the idea behind Adelic torus orbits we will discuss how they can be used to prove equidistribution results on (real) homogeneous spaces.
Zurich Graduate ColloquiumWhat is... an adelic torus orbit?read_more |
KO2 F 150 |
Wednesday, 1 May | |||
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— no events scheduled today — |
Thursday, 2 May | |||
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Time | Speaker | Title | Location |
10:15 - 12:00 |
Umut Çetin London School of Economics |
HG G 43 |
|
10:15 - 12:00 |
Shahar Mendelson The Australian National University |
HG G 19.2 |
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17:15 - 18:15 |
Prof. Dr. Luciano Campicall_made University of Milan |
Abstract
Coarse correlated equilibria are generalizations of Nash equilibria which have first been introduced in Moulin et Vial (1978). They include a correlation device which can be interpreted as a mediator recommending strategies to the players, which makes it particularly relevant in a context of market failure. After establishing an existence and approximation results result in a fairly general setting, we develop a methodology to compute mean-field coarse correlated equilibria (CCEs) in a linear-quadratic framework. We identify cases in which CCEs outperform Nash equilibria in terms of both social utility and control levels. Finally, we apply such a methodology to a CO2 abatement game between countries (a slightly modified version of Barrett (1994)). We show that in that model CCEs allow to reach higher abatement levels than the NE, with higher global utility. The talk is based on joint works with F. Cannerozzi (Milan University), F. Cartellier (ENSAE) and M. Fischer (Padua University).
Talks in Financial and Insurance MathematicsMean field coarse correlated equilibria with applicationsread_more |
HG G 43 |
Friday, 3 May | |||
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Time | Speaker | Title | Location |
16:00 - 17:30 |
Alessio Cela ETH Zürich |
Abstract
I will explain how to compute the integral Chow ring of the moduli stack R_2 of Prym pairs of genus 2.
Algebraic Geometry and Moduli SeminarThe integral Chow ring of the moduli stack of Prym pairs of genus 2read_more |
HG G 43 |