var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-24"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-22"><img src="//www2.math.ethz.ch/smsjs/images/arrow_right.png"/></a></div>    <div class="sms_title">      <span style="float: left;">SMS</span>      <span>SWISS MATHEMATICAL SOCIETY</span>      <span style="float: right;">SMG</span>    </div>    <div class="sms_info">      <span style="float: left; width: 250px;">Bulletin no. 9</span>      <span style="float: right; text-align:right; width: 250px;">11.11 - 15.11.2024</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Autumn Semester 2024</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, November 11      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Tom Mrowka (Massachusetts Institute of Technology)</div><div class="event_title">Floer homology of three manifolds and applications to low dimensional topology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Floer homology and the related invariants of 4-manifolds has given us deep insight in smooth differential topology in dimensions 3 and particularly 4. The theory has yielded insights like existence of exotic differentiable structures on 4 dimensional euclidean space, complex curves minimize genus in complex projective space, killing the Hauptvermuntung, there even appear to be connection to the 4 color map theorem. This course will build up Floer homology of three manifolds from scratch. The focus will be on Instanton Floer homology but we will mention other versions and develop applications as the course goes on.</div><div class="event_time">10:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Miltiadis  Stouras</div><div class="event_title">Data-Driven Solution Portfolios <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We introduce a new problem of portfolio optimization using stochastic information.In a setting where there is some uncertainty, we ask how to best select $k$ potential solutions, with the goal of optimizing the value of the best solution.  More formally, given a combinatorial problem $\\Pi$, a set of value functions $\\mathcal{V}$ over the solutions of $\\Pi$, and a distribution $\\mathcal{D}$ over $\\mathcal{V}$, our goal is to select $k$ solutions of $\\Pi$ that maximize or minimize the expected value of the {\\em best} of those solutions.For a simple example, consider the classic knapsack problem: given a universe of elements each with unit weight and a positive value, select a set of $r$ elements maximizing the total value. Now suppose that each element\'s weight comes from a (known) distribution. How to best select $k$ different solutions, so that one of them is likely to be near optimal?In this work we tackle this basic problem, and generalize it to the setting where the underlying set system forms a matroid.On the technical side, it is clear that the candidate solutions we select must be diverse and anti-correlated, however, it is not clear how to do so efficiently.Our main result is a polynomial-time algorithm that computes ``anti-concentrated\'\' solutions and constructs a portfolio within a constant factor of the optimal.Joint work with Marina Drygala, Silvio Lattanzi, Andreas Maggiori, Ola Svensson and Sergei Vassilvitskii.</div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=fables">Séminaire "Fables Géométriques" </a></div><br /><div class="event_speaker"> Nikon Kurnosov (Glasgow)</div><div class="event_title">Bounds on Betti numbers of holomorphically symplectic manifolds and conjectures all around <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will review how to construct holomorphically symplectic manifolds, there are four series of hyperkahler ones, one non-Kahler (BG-manifolds) and some singular ones known. I will talk on ideas how to bound the Betti numbers of holomorphic symplectic manifolds. And explain on the connection to some other conjectures like Nagai’s conjecture and SYZ conjecture. </div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.einsteinlectures.ch/">Einstein Lectures </a></div><br /><div class="event_speaker"> Susan R.  Wolf (University of North Carolina)</div><div class="event_title"><a class="external" href="https://www.einsteinlectures.unibe.ch/einstein_lectures_2024/einstein_lectures_2024_lecture_1/index_ger.html">On Being Distinctively Human</a></div><div class="event_time">19:30 &bull; Universität Bern</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, November 12      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Gigliola Staffilani (Massachusetts Institute of Technology)</div><div class="event_title">Dispersive equations and wave turbulence theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this course we will investigate questions of weak turbulence theory by using as explicit example of wave interactions the solutions to periodic and nonlinear Schrödinger equations. We will start with Strichartz estimates on periodic setting, then we will move to well-posedness.We will then present two different ways of introducing the evolution of the energy spectrum. We will first work on a method proposed by Bourgain and involving the growth of high Sobolev norms. Then, we will give some ideas of how to derive rigorously the effective dynamics of the energy spectrum itself (wave kinetic equation), when one considers weakly nonlinear dispersive equations.</div><div class="event_time">10:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/annonces/groupes-geometrie">Groupes et Géométrie </a></div><br /><div class="event_speaker"> Giles Gardam (University of Bonn)</div><div class="event_title">The Kaplansky conjectures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />There is a series of four fundamental and long-standing conjectures on group rings attributed to Kaplansky. For example, the zero divisor conjecture states that the group ring of a torsion-free group with field coefficients has no zero divisors. I will discuss these conjectures, their connections to other open questions in various areas of mathematics (such as soficity), and the disproof of the unit conjecture.</div><div class="event_time">10:30 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/annonces/seminaire-danalyse-numerique">Séminaire d\'Analyse Numérique </a></div><br /><div class="event_speaker"> Laurence Halpern (Sorbonne Paris Nord)</div><div class="event_title">Title T.B.A.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker">Dr. Francisco Mengual (Max Planck Institute Leipzig)</div><div class="event_title">Unstable vortices and sharp non-uniqueness for the forced SQG equation <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the groundbreaking works [2,3], Vishik proved non-uniqueness for the 2D Euler equation with forcing, below the Yudovich well-posedness class. A nice exposition of this result can be found in [1]. In this talk, we present a simpler proof and show how to extend the result to the Surface Quasi-Geostrophic (SQG) equation. Specifically, we prove non-uniqueness for the forced $\\alpha$-SQG equation in $H^s$ for any $s&lt;1+\\alpha$ and $0\\leq\\alpha\\leq 1$. This family of active scalar equations interpolates between the 2D Euler equation ($\\alpha=0$) and the SQG equation ($\\alpha=1$).This is a joint work with Castro, Faraco and Solera.[1] D. Albritton, E. Brué, M. Colombo, C. De Lellis, V. Giri, M. Janisch, and H. Kwon. Instability and non-uniqueness for the 2D Euler equations, after M. Vishik. Annals of Mathematics Studies. Princeton University Press, Princeton, 2024.[2] M. Vishik. Instability and non-uniqueness in the Cauchy problem for the Euler equations of an ideal incompressible fluid. Part I. arXiv:1805.09426, 2018.[3] M. Vishik. Instability and non-uniqueness in the Cauchy problem for the Euler equations of an ideal incompressible fluid. Part II. arXiv:1805.09440, 2018.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat075.1">Zurich Graduate Colloquium</a></div><br /><div class="event_speaker">Andrea Ulliana (Universität Zürich)</div><div class="event_title">What is... Szemerédi\'s Theorem? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />As firstly conjectured by Erdös and Turán in 1936, in 1972 Szemerédi proved that any positive density subset of \\(N\\) contains arbitrary long arithmetic progressions. Determinant contributions came from very different fields: harmonic analysis, graph theory and ergodic theory. This theorem uncovered deep connections between these fields and sits at the foundation of the celebrated Green-Tao theorem about arithmetic progressions of prime numbers. During the talk we will introduce the notion of density of a subset of \\(N\\) and we will motivate the statement of the theorem. We will then turn our attention to Roth\'s theorem (Szemerédi\'s theorem for arithmetic progressions of length 3): we will sketch the harmonic analysis proof by Roth (1953) and we will mention Szemerédi\'s alternative one, that exploits the \'subgraph removal lemma\' and opened the way to a proof of Szemerédi\'s theorem. Finally we will discuss Furstenberg alternative proof (1977) of Szemerédi\'s theorem, based on his \'Correspondence principle\' between subsets of \\(N\\) and measure preserving dynamical systems.</div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.einsteinlectures.ch/">Einstein Lectures </a></div><br /><div class="event_speaker"> Susan R. Wolf (University of North Carolina)</div><div class="event_title"><a class="external" href="https://www.einsteinlectures.unibe.ch/einstein_lectures_2024/einstein_lectures_2024_lecture_2/index_ger.html">Character and Agency</a></div><div class="event_time">17:15 &bull; Universität Bern</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Olaf Merkert (TNG Technology Consulting GmbH)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoulli-meets-industry-olaf-merkert-tng-technology-consulting-gmbh/">Evening event with apéro</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Have you ever wondered what to do after your degree? We invite you to the new seminar "Bernoulli meets Industry", an evening event where former mathematicians talk about their current work, followed by an apéro. flyer</div><div class="event_time">17:30 &bull; Universität Basel, Spiegelgasse 1, 00.003</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, November 13      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://calendar.google.com/calendar/embed?mode=AGENDA&height=600&wkst=2&bgcolor=%23FFFFFF&src=t36it03v52cus2detrvinlgk18%40group.calendar.google.com&color=%235F6B02&ctz=Europe%2FZurich">Groups, Arithmetic and Algebraic Geometry Seminar </a></div><br /><div class="event_speaker"> Javier de la Bodega-Aldama (KU Leuven)</div><div class="event_title">The arc-Floer conjecture: from arithmetic to symplectic topology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the same philosophy as the Weil conjectures, Igusa\'s classical monodromy conjecture suggests a mysterious connection between the arithmetic and the topology of hypersurface singularities. Although it has been verified in several cases, the conjecture is still widely open, and the attempts to solve it have motivated new developments in different directions: motivic, nonarchimedean, model-theoretic, etc. In 2022, Budur, F. de Bobadilla, Lê and Nguyen suggested a new approach by exploding the symplectic properties of the Milnor fibration.More precisely, the authors suggested the so-called arc-Floer conjecture, which states that the cohomology of contact loci coincides (up to a shift) with the Floer homology of the iterates of a symplectic monodromy. However, the authors formulated the conjecture based on analogies but not on actual evidence. In 2023, de la Bodega and de Lorenzo Poza verified it for plane curve singularities, providing the first piece of evidence supporting the arc-Floer conjecture. In this talk, we will give an overview of the problem and explain the proof for plane curves.</div><div class="event_time">10:15 &bull; EPF Lausanne</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/cmgr/cmgr/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Julia Münch (University of Liverpool)</div><div class="event_title"><a class="external" href="https://memento.epfl.ch/private/workspace/None/event/114147">Extending rational expanding Thurston maps</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Uniformly quasi-regular maps are a suitable class to study in order to extend the concepts and ideas of complex dynamics to non-holomorphic functions. The dynamics of quasi-regular mappings are particularly interesting in R^n for n equal to at least 3. However it is not easy to find non-trivial examples of uniformly quasi-regular maps. In the talk I will present how one can extend any rational expanding Thurston map f defined on the Riemann sphere to a map F defined on an open neighbourhood &#937; containing S^2. The map is uniformly quasi-regular as long as the iteration is defined. In a second part I will talk about properties of the extension with respect to the Poincare metric on the unit ball. I will show how to find a quasi-isometric embedding of the hyperbolic plane into B(0,1) arising from the dynamics of f on the sphere. This is work in progress. </div><div class="event_time">11:15 &bull; <a class="external" href="https://plan.epfl.ch/?room==CH%20B3%2031">EPF Lausanne, CH B3 31</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Prof. Dr. Michael Hochman (The Hebrew University of Jerusalem)</div><div class="event_title">New results on embedding and intersections of self-similar sets <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss the problem of affinely embedding self-similar sets in the line into other such sets. Conjecturally, embedding is precluded when the contraction ratios of the defining maps are incommensurable. This is closely related to conjectures on intersections of fractals, but in the open cases even the embedding problem is challenging. I will describe recent joint work with Amir Algom and Meng Wu in which we confirm the conjecture whenever the contraction ratios are algebraic numbers, and also for a.e. choice of parameters. I will discuss the proof. If time permits, I will explain how this is related to the dimension of alpha-beta sets, and describe recent examples that show that the problem is more delicate than anticipated.</div><div class="event_time">13:30 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 28</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Prof. Dr. Alexander Polishchuk (Univ. of Oregon and FIM)</div><div class="event_title">Equations of some birational models of M_g,n. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss examples of birational models of M_{g,n} that on the one hand are given as GIT-quotients for torus actions on explicit affine schemes, and on the other hand admit modular descriptions. I’ll focus mostly oncases g=0 and g=1.</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Séminaire de Topologie </a></div><br /><div class="event_speaker"> Ruben Mud (Independent)</div><div class="event_title"><a class="external" href="https://www.epfl.ch/labs/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Betweenness in Enriched Categories</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The geometrically intuitive notion of betweenness was first formally introduced by Pasch in 1882. Since then, it has found applications in graph theory, combinatorics, artificial intelligence, and circuit design. In this talk, we will argue that enriched categories form a natural framework to reason about betweenness geometry. It turns out that there is a functorial correspondence between the category of betweenness spaces and the category of enriched categories. Using this correspondence, we obtain new interpretations of betweenness with potential applications to causal discovery.</div><div class="event_time">14:15 &bull; <a class="external" href="https://plan.epfl.ch/?room==CM%201%20517">EPF Lausanne</a></div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/forschung/mathematik/analysis/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker"> Paolo Bonicatto (Università degli Studi di Trento)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-analysis-and-mathematical-physics-paolo-bonicatto-universita-degli-studi-di-trento/">On the strong locality of differential operators</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />It is well known that, given a Sobolev function vanishing in a measurable set, the gradient must vanish almost everywhere on that set. This property is usually called "locality of the gradient operator". In the seminar, we will introduce the notion of locality for general linear (first-order) differential operators and we will discuss some sufficient and necessary conditions for locality to hold. We will present several examples and, if time allows, a complete catalogue of differential operators in the 2D setting. This is part of ongoing projects with G. Alberti (Pisa) and G. Del Nin (MPI, Leipzig).</div><div class="event_time">14:15 &bull; Universität Basel, Spiegelgasse 5, Seminarraum 05.002</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> John Baldwin (Boston College)</div><div class="event_title">Characterizing traces for knots <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />There has been a lot of interest in understanding which knots are characterized by which Dehn surgeries. In this talk, I\'ll propose studying a 4-dimensional version of this question: which knots are determined by the orientation-preserving diffeomorphism types of which traces? I\'ll discuss several results that are in stark contrast with what is known about characterizing slopes; for example, that every algebraic knot is determined by its 0-trace. Moreover, every positive torus knot is determined by its n-trace for any n &lt;= 0, whereas no non-positive integer is known to be a characterizing slope for any positive torus knot besides the right-handed trefoil. Our proofs use tools from Heegaard Floer homology and results about surface homeomorphisms.</div><div class="event_time">15:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Ana Djurdjevac (Freie Universität Berlin)</div><div class="event_title">Quantitative approximation of the Dean-Kawasaki equation with interactions <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Interacting particle systems provide flexible and powerful models that are useful in many application areas such as sociology (agents), molecular dynamics (proteins) etc. However, particle systems with large numbers of particles are very complex and difficult to handle, both analytically and computationally. Therefore, a common strategy is to derive effective equations that describe the time evolution of the empirical particle density. A prototypical example that we will consider is the formal identification of a finite system of particles with the singular Dean-Kawasaki equation.Our aim is to introduce a well-behaved nonlinear SPDE that approximates the Dean-Kawasaki equation for a particle system with mean-field interaction both in the drift and the noise term. We want to study the well-posedness of these nonlinear SPDE models and to control the weak error of the SPDE approximation with respect to the particle system using the technique of transport equations on the space of probability measures.This is the joint work with H. Kremp, N. Perkowski and J. Xiaohao.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.einsteinlectures.ch/">Einstein Lectures </a></div><br /><div class="event_speaker"> Susan R. Wolf (University of North Carolina)</div><div class="event_title"><a class="external" href="https://www.einsteinlectures.unibe.ch/einstein_lectures_2024/einstein_lectures_2024_lecture_3/index_ger.html">Freedom for Humans</a></div><div class="event_time">19:30 &bull; Universität Bern</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, November 14      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://calendar.google.com/calendar/embed?mode=AGENDA&height=600&wkst=2&bgcolor=%23FFFFFF&src=t36it03v52cus2detrvinlgk18%40group.calendar.google.com&color=%235F6B02&ctz=Europe%2FZurich">Groups, Arithmetic and Algebraic Geometry Seminar </a></div><br /><div class="event_speaker"> Johannes Krah</div><div class="event_title">On proper splinters in positive characteristic. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />: A scheme X is a splinter if for any finite surjective morphism f: Y \\to X the pullback map O_X \\to f_* O_Y splits as O_X-modules. By the direct summand conjecture, now a theorem due to André, every regular Noetherian ring is a splinter. Whilst for affine schemes the splinter property can be viewed as a local measure of singularity, the splinter property imposes strong constraints on the global geometry of proper schemes over a field of positive characteristic. For instance, the structure sheaf of a proper splinter in positive characteristic has vanishing positive-degree cohomology. I will report on joint work with Charles Vial concerning further obstructions on the global geometry of proper splinters in positive characteristic.</div><div class="event_time">13:15 &bull; EPF Lausanne, CM 1 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://stat.ethz.ch/events/research_seminar">Research Seminar in Statistics</a></div><br /><div class="event_speaker"> Chen Zhou (Erasmus University, Rotterdam)</div><div class="event_title">High dimensional inference for extreme value indices <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />When applying multivariate extreme values statistics to analyze tail risk in compound events defined by a multivariate random vector, one often assumes that all dimensions share the same extreme value index. While such an assumption can be tested using a Wald-type test, the performance of such a test deteriorates as the dimensionality increases. This paper introduces a novel test for testing extreme value indices in a high dimensional setting. We show the asymptotic behavior of the test statistic and conduct simulation studies to evaluate its finite sample performance. The proposed test significantly outperforms existing methods in high dimensional settings. We apply this test to examine two datasets previously assumed to have identical extreme value indices across all dimensions.This is a joint work with Liujun Chen (USTC)</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room E 41</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/~palmeran/topsem.html">Séminaire de Topologie et Géométrie </a></div><br /><div class="event_speaker"> Nikolay  Abrosimov (Sobolev Institute of Mathematics, Novosibirsk)</div><div class="event_title">Euclidean volume of a cone manifold over any hyperbolic knot is an algebraic number <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The talk is based on our joint work [1] with Alexander Kolpakov (Université de Neuchâtel, Switzerland) and Alexander Mednykh (Sobolev Institute of Mathematics, Novosibirsk).A hyperbolic structure on a three-dimensional cone manifold with a knot as a singular set can usually be deformed into a limit Euclidean structure. In our paper [1] we show that the corresponding normalized Euclidean volume of the manifold is always an algebraic number i.e. a root of some polynomial with integer coefficients. This result is a generalization (for cone manifolds) of the well-known Sabitov theorem on the volumes of Euclidean polyhedra which gave an answer to the bellows problem. The fact we established stands out against the background of hyperbolic volumes the number-theoretic nature of which is usually quite complex. In addition to this theorem we propose an algorithm that allows one to explicitly calculate the minimal polynomial for a normalized Euclidean volume.[1] N. Abrosimov A. Kolpakov A. Mednykh Euclidean volumes of hyperbolic knots // Proc. Amer. Math. Soc. 152 (2024) 869-881. DOI: 10.1090/proc/16353</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://sites.google.com/view/pm-seminar/home">Physical Mathematics Seminar</a></div><br /><div class="event_speaker"> Ivan Tulli (University of Sheffield)</div><div class="event_title">Special Joyce structures and hyperkähler metrics. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Joyce structures were introduced by T. Bridgeland in the context of the space of stability conditions Stab(X) of a 3d Calabi-Yau category X and its associated Donaldson-Thomas (DT) invariants. They are described by a certain C^*-family of non-linear flat connections on the tangent bundle T(Stab(X)) of Stab(X) and, under certain non-degeneracy conditions, encode a complex-hyperkähler structure on T(Stab(X)). On the other hand, the work of Gaiotto-Moore-Neitzke (GMN) shows how to construct from the Coulomb branch M of a 4d N=2 theory and its associated BPS indices, a real-hyperkähler (HK) geometry on the cotangent bundle T*M of M. This HK metric is the instanton corrected metric associated with the 3d theory obtained by compactifying the 4d N=2 theory on S^1. In this talk, I will try to reinterpret the GMN construction in a way that is similar to Joyce structures. The resulting structure is called a "special Joyce structure", and encodes an HK geometry on T*M. At least in the case where the BPS indices are uncoupled, the HK metric encoded by the corresponding special Joyce structure is shown to match the GMN HK metric. As a by-product of this description, we will see that the GMN HK geometry in the uncoupled case can be encoded in the geometry of the base M, together with a single function J on T^*M determined by the BPS indices. The function J seems to be related to a function previously studied by S. Alexandrov and B. Pioline in arXiv:1808.08479, which they call the "instanton generating function". This talk is based on arXiv:2403.00548. </div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/talks-in-financial-and-insurance-mathematics">Talks in Financial and Insurance Mathematics</a></div><br /><div class="event_speaker"> Yifan Jiang (University of Oxford)</div><div class="event_title">Sensitivity of causal distributionally robust optimization <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this talk, we study the causal distributionally robust optimization (DRO) in both discrete and continuous-time settings. The framework captures model uncertainty, with potential models penalized in function of their adapted Wasserstein distance to a given reference model. The strength of model uncertainty is parameterized via a penalization parameter, and we compute the first-order sensitivity of the value of causal DRO with respect to this parameter. Moreover, we investigate the case where a martingale constraint is imposed on the underlying model, as is the case for pricing measures in mathematical finance. We introduce different scaling regimes, which allow us to obtain the continuous-time sensitivities as nontrivial limits of their discrete-time counterparts. Our proofs rely on novel methods. In particular, we introduce a pathwise Malliavin derivative, which agrees with its classical counterpart under the Wiener measure, and we extend the adjoint operator, the Skorokhod integral, to regular martingale integrators and show it satisfies a stochastic Fubini theorem.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, November 15      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/forschung/mathematik/seminar-in-numerical-analysis">Seminar in Numerical Analysis</a></div><br /><div class="event_speaker"> Marco Picasso (EPFL)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-in-numerical-analysis-marco-picasso-epfl/">Anisotropic adaptive finite elements for steady and unsteady problems</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Anisotropic adaptive meshes, that is to say adaptive meshes with large aspect ratio, are extremely efficient to approach functions having boundary or internal layers, some industrial applications will be presented. The theory will be justified on elliptic problems, and on the transport equation when using the order two Crank-Nicolson scheme. For further information about the seminar, please visit this webpage .</div><div class="event_time">11:00 &bull; Universität Basel, DMI, Spiegelgasse 5, 4051 Basel Seminarraum 05.001</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/schools/sb/research/math/statistics-seminars/">Statistics Seminar </a></div><br /><div class="event_speaker"> Ryan Campbell (Lancaster University)</div><div class="event_title">A geometric approach for multivariate extremal inference <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Until recently, different types of joint tail dependence of random vectors required different modelling procedures, resulting in a lack of a unified approach for modelling multivariate extremes. A new development remedies this by using the geometry of the dataset to perform inference on the multivariate tail. A key quantity in this inference is the so-called "gauge function", whose values define this geometry.In this talk, I\'ll present two methods to estimate the gauge function given data. The first relies on parametric assumptions on the form of the gauge function. The second is semi-parametric, interpolating the domain of the gauge function in a piecewise-linear fashion. This results in a simple construction that is flexible on data with extremal dependence behaviour that is difficult to parameterise, and is more suitable for higher-dimensional applications. The piecewise-linear gauge function can be useful in defining a radial and an angular model, allowing for the joint fitting of extremal pseudo-polar coordinates. This new methodology is applied to environmental datasets, a setting where classical multivariate extremes methods often struggle due to the potential combination of dependence and independence in the joint tails.Joint work with my PhD supervisor, Jennifer Wadsworth.</div><div class="event_time">14:00 &bull; EPF Lausanne, CM 1 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://stat.ethz.ch/events/zukost">ZueKoSt: Seminar on Applied Statistics</a></div><br /><div class="event_speaker"> Jan Dirk Wegner (Department of Mathematical Modeling and Machine Learning (DM3L), University of Zurich)</div><div class="event_title">Monitoring Earth with Remote Sensing and Deep Learning <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Modern deep learning in combination with satellite data offers great opportunities to protect nature at global scale. I will present ongoing research to map crops at country-scale, for species distribution modeling, to estimate vegetation parameters such as biomass and vegetation height, and how conflicts can be monitored remotely. Traditional approaches usually must be adapted for specific ecosystems and regions. It is therefore very difficult to carry out homogeneous, large-scale modeling with high spatial and temporal resolution and, at the same time, good accuracy. Data-driven approaches, especially modern deep learning methods, promise great potential here to achieve globally consistent, transparent assessments of our environment. Bio:Jan Dirk Wegner leads the EcoVision Lab at the DM3L at University of Zurich as an Associate Professor. Jan was PostDoc (2012-2016) and senior scientist (2017-2020) in the Photogrammetry and Remote Sensing group at ETH Zurich after completing his PhD (with distinction) at Leibniz Universität Hannover in 2011. His main research interests are at the frontier of machine learning, computer vision, and remote sensing to solve scientific questions in the environmental sciences and geosciences. Jan was granted multiple awards, among others an ETH Postdoctoral fellowship and the science award of the German Geodetic Commission. He was selected for the WEF Young Scientist Class 2020 as one of the 25 best researchers world-wide under the age of 40 committed to integrating scientific knowledge into society for the public good. Jan is vice-president of ISPRS Technical Commission II, associated faculty of the ETH AI Center, director of the PhD graduate school "Data Science" at University of Zurich, and his professorship is part of the Digital Society Initiative at University of Zurich. Together with colleagues, Jan is chairing the CVPR EarthVision workshops.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room E 41</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_fr"><a class="external" href="https://www.unifr.ch">Université de Fribourg</a></div><div class="event_type"><a class="external" href="https://www.unifr.ch/math/de/info/plancherel/">Michel Plancherel Lectures </a></div><br /><div class="event_speaker">Prof. Dr. Günter M. Ziegler (Freie Universität Berlin)</div><div class="event_title">Kanonen auf Spatzen: Eine grosse Reise durch die Mathematik für ein kleines Problem aus der Geometrie <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />[Presentation in English with German Slides] Nicht jedes einfach-klingende Problem hat auch eine einfache Lösung, manchmal lohnt es sich, für ganz harmlose Fragen auf hochentwickelte mathematische Theorien zuzugreifen. Ein Beispiel — und der Ausgangspunkt für diesen Vortrag — ist ein scheinbar elementares Problem aus der ebenen Geometrie, gestellt im September 2006 in einem Blog-Beitrag von R. Nandakumar, einem Ingenieur aus Kalkutta: „Kann man jedes Polygon in eine vorgeschriebene Anzahl von konvexen Teilen zerschneiden, die alle den gleichen Umfang und die gleiche Fläche haben?” Und los geht’s, auf eine grosse Reise durch die Mathematik für ein kleines Problem aus der Geometrie.</div><div class="event_time">15:15 &bull; Université de Fribourg, PER21 auditorium G120</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/schools/sb/research/math/statistics-seminars/">Statistics Seminar </a></div><br /><div class="event_speaker"> Oliver  Feng (University of Bath)</div><div class="event_title">Optimal convex M-estimation via score matching <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the context of linear regression, we construct a data-driven convex loss function with respect to which empirical risk minimisation yields optimal asymptotic variance in the downstream estimation of the regression coefficients.Our semiparametric approach targets the best decreasing approximation of the derivative of the log-density of the noise distribution. At the population level, this fitting process is a nonparametric extension of score matching, corresponding to a log-concave projection of the noise distribution with respect to the Fisher divergence. The procedure is computationally efficient, and we prove that our procedure attains the minimal asymptotic covariance among all convex M-estimators.As an example of a non-log-concave setting, for Cauchy errors, the optimal convex loss function is Huber-like, and our procedure yields an asymptotic efficiency greater than 0.87 relative to the oracle maximum likelihood estimator of the regression coefficients that uses knowledge of this error distribution; in this sense, we obtain robustness without sacrificing much efficiency. Numerical experiments confirm the practical merits of our proposal.This is joint work with Yu-Chun Kao, Min Xu and Richard Samworth</div><div class="event_time">15:15 &bull; EPF Lausanne, CM 1 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Dr. Simon Telen (MPI Leipzig)</div><div class="event_title">Adjoints and canonical differential forms  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The adjoint hypersurface of a simple convex polytope is uniquely defined by interpolation conditions. Its defining equation is the numerator of a meromorphic volume form associated to the polytope, called its canonical form. That form has applications in optimization and particle physics. We extend these assertions to amplituhedra in the Grassmannian of lines in three-space. Joint work with Kristian Ranestad and Rainer Sinn. </div><div class="event_time">16:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>      </div>    </div>  </div>  <div id="sms_footer">    address: Alessandra Naldi Windler, Departement Mathematik, HG G 51.4, ETH Zurich, Raemistrasse 101, CH-8092 Zurich<br />    email: <a href="mailto:bulletin@math.ch">bulletin@math.ch</a> | phone: +41 44 632 3684 | url: <a href="https://math.ch">https://math.ch</a>    <br /><br /><img src="//www2.math.ethz.ch/smsjs/sms_logo.gif" width="150" alt="SMS/SMG Logo" title="SMS/SMG Logo" />  </div></div>';