var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-29"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-27"><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. 4</span>      <span style="float: right; text-align:right; width: 250px;">7.10 - 11.10.2024</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, October 7      </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"> Gilbert  Maystre</div><div class="event_title">The Complexity of Two-Team Polymatrix Games with Independent Adversaries <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In a polymatrix team-game, players are grouped in teams so that any twoagents plays a coordination game if they are from the same team and azero-sum game if they are from different teams. It is known thatcomputing a Nash equilbrium is in CLS when there is only one team andalready as hard as general Nash equilibrium for three teams. In thistalk, we will explore the two-team case and show it is CLS-hard ingeneral and CLS-complete for the restricted setting of one team notcoordinating. This also has interesting implications on the complexityof solving some min-max formulations.</div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</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://math.ethz.ch/s/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker">Prof. Dr. Anton Khoroshkin (University of Haifa)</div><div class="event_title">On Generating Series of Cohomology of Generalized Configuration Spaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A generalized configuration space on $X$ consists of a collection of points on $X$ with specific rules governing which points cannot coincide. In this work, I will introduce a new algebraic structure, called a "contractad," on the union of these spaces for $X = \\mathbb{R}^n$, which extends the concept of the little discs operad. I will demonstrate how this algebraic framework can be used to extract information regarding the Hilbert series of cohomology rings.  Surprisingly, the same approach can be applied to generate series for various combinatorial data associated with graphs, such as the number of Hamiltonian paths, Hamiltonian cycles, acyclic orientations, and chromatic polynomials.   Additionally, natural compactifications of these configuration spaces for $X = \\mathbb{C}$ generalize the Deligne-Mumford compactification of moduli spaces of rational curves with marked points. If time allows, we will also discuss the generating series for their cohomology.   The talk is based on the joint work with D.Lyskov: https://arxiv.org/abs/2406.05909</div><div class="event_time">13:30 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 25</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/symplectic-geometry-seminar">Symplectic Geometry Seminar</a></div><br /><div class="event_speaker"> Remi Leclercq (Paris-Saclay University, Paris)</div><div class="event_title">Local exactness of nearby Lagrangians and topological properties of orbits of Lagrangians <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The central point of this talk is to present a strategy for proving that Lagrangians which are displaceable by a Hamiltonian diffeomorphism admit a "Weinstein neighborhood of non-displacement", i.e. a neighborhood W of the given Lagrangian L such that if the image of L by a Hamiltonian diffeomorphism is included in W, it must intersect L. When the inclusion of L into M induces the 0-map at the level of first homology groups with real coefficients, this non-displacement property also holds for any Lagrangian included in W which is the image of L by a (non necessarily Hamiltonian) symplectomorphism. In both cases, non-displacement follows directly from "local exactness" of nearby Lagrangians, i.e. the fact that any Lagrangian in the Hamiltonian or symplectic orbit of L, included in W, is exact in W seen as a subset of T*L. I will give several natural examples for which such a neighborhood exists. I will then discuss applications of this line of ideas in terms of the topology of the Hamiltonian orbit of L, and in terms of C^0 symplectic geometry. This is joint work with Jean-Philippe Chassé.</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_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Mathematisches Kolloquium </a></div><br /><div class="event_speaker">Prof. Dr. Claire Burrin (University of Zurich)</div><div class="event_title"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Rational Points on Spheres</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss my current favorite illustration of the `unreasonable effectiveness\' of modular forms at the hand of the problem of quantifying the density of rational points on the sphere.</div><div class="event_time">17:15 &bull; Universität Bern, Sidlerstrasse 5, 3012 Bern, Room 228</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, October 8      </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_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. William Cooperman (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Exponential scalar mixing for 2D Navier–Stokes with degenerate stochastic forcing <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss a joint work with Keefer Rowan (Courant Institute, NYU) in which we show exponential mixing of passive scalars advected by a solution to the stochastic Navier–Stokes equations with finitely many (e.g. four) forced modes satisfying a hypoellipticity condition. Our proof combines the asymptotic strong Feller framework of Hairer and Mattingly with the mixing theory of Bedrossian, Blumenthal, and Punshon-Smith.</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_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://memento.epfl.ch/event/probability-and-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Slava Rychkov (IHES)</div><div class="event_title">Introduction to renormalization group of tensor networks <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I\'ve been recently thinking what it would take to rigorously prove the existence of a critical renormalization group fixed point for a tensor RG transformation which is a kind of RG transformation of 2D lattice models that I will introduce. There is great numerical evidence for convergence of tensor network RG maps, but can we turn this into a proof? The problem is more amenable than for block-spin RG maps, but not fully trivial since one needs to work with infinite-dimensional tensors, satisfy the Hilbert-Schmidt condition, and involve "disentangling."  After explaining these issues, I will describe some rigorous results about how the approach to high and low temperature fixed points can be handled without truncation. I will also describe some numerical results about Newton method acceleration of tensor network RG. Joint work with Nikolay Ebel and Tom Kennedy. </div><div class="event_time">15:30 &bull; EPF Lausanne, CM 1 121</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, October 9      </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://www.epfl.ch/labs/cmgr/cmgr/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Ruth Kellerhals (UniFr)</div><div class="event_title"><a class="external" href="https://memento.epfl.ch/private/workspace/None/event/113447">From hyperbolic growth rates to Salem numbers and back</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A hyperbolic Coxeter group G is a cofinite discrete group generated by a finite set S of hyperplane reflections in hyperbolic space Hn.The growth series f_S(t) of G is the formal power series whose coefficients a_k count the number of words of S-length equal to k. The growth rate of G as given by the inverse of the convergence radius of f_S(t) turns out to be an algebraic integer >1.By a result of E. Hironaka, the smallest growth rate of any cocompact planar hyperbolic Coxeter group is achieved by the Coxeter triangle group (2,3,7) and equals Lehmer’s number &#945; &#8776; 1.17628. The number &#945;_L is the smallest known Salem number and of particular importance in view of Lehmer’s Conjecture.Beyond that, and by a result of Siegel, the Coxeter group (2,3,7) is also distinguished by realising minimal covolume among all fundamental groups of hyperbolic orbifolds of dimension two.We shall discuss similar connections and related aspects from various point of views and especially in higher dimensions n>2.  In particular, we will present our result stating that not every Salem number appears as the growth rate of a cocompact hyperbolic Coxeter group (joint with L. Liechti).</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">Dr. Pouya Honaryar (Universität Zürich)</div><div class="event_title">Central limit theorem for homology of simple closed curves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Fix a hyperbolic surface $X$, and for $L &gt; 0$, let $\\mathcal{S}_L(X)$ denote the set of simple closed geodesics of length at most $L$ on $X$. Fixing a norm on $H_1(X, \\mathbb{R})$, we may ask what is the statistics of the norm of homology class of $\\alpha$, denoted by $[\\alpha]$, when $\\alpha$ is chosen randomly uniformly from $\\mathcal{S}_L(X)$, as $L \\rightarrow \\infty$? For example, does one expect the norm of $[\\alpha]$ to be of order $L$ or smaller? We answer this question by proving a CLT-type result for the norm of homology of a randomly chosen curve in $\\mathcal{S}_L(X)$. We discuss the main steps to reduce the desired CLT to a CLT for the Kontsevich-Zorich cocycle obtained by Forni-Saqban. (Joint work with F. Arana-Herrera)</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">Dr. Johannes Schmitt (ETH Zürich)</div><div class="event_title">Complex abelian varieties and their moduli III <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Tropical abelian varieties and their moduli</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"> Jan-Paul Lerch (Universität Bielefeld)</div><div class="event_title"><a class="external" href="https://www.epfl.ch/labs/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Decomposition of generalised block modules</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Interval decomposability of multiparameter persistence modules is a strong property, which can be characterised locally in some cases. A known example are 2-parameter (pointwise finite dimensional) block modules, originating in the context of levelset persistence. They satisfy an exactness property, which completely determines this class of (pointwise finite-dimensional) modules.In this talk we discuss a generalised class of block modules in n parameters and how they are completely determined by a generalised local property.This is joint work with V. Lebovici and S. Oudot (https://arxiv.org/abs/2402.16624).(If time permits, I will also talk about the most recent project.)</div><div class="event_time">14:00 &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_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"> Alexander Dranishnikov (University of Florida)</div><div class="event_title">On Gromov\'s Positive Scalar Curvature Conjecture for RAAGs <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Gromov\'s PSC conjecture for a discrete group G states that the universal cover of a closed PSC n-manifold with the fundamental group G has the macroscopic dimension less than or equal to n-2. We prove Gromov\'s conjecture for right-angled Artin groups (RAAGs).</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_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://memento.epfl.ch/event/probability-and-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Fredrik Viklund</div><div class="event_title">Coulomb gas on a Jordan domain <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Consider a Coulomb gas restricted to a Jordan domain in the complex plane. How does the asymptotic expansion of the free energy depend on the geometry of the domain, as the number of particles tends to infinity? I will explain how this problem is related to the Grunsky operator -- a classical tool in complex analysis -- and how this in turn reveals a close connection to the Loewner energy. I will further discuss the effect of corners,  which turns out to be universal in a certain sense. This is joint work with Kurt Johansson (KTH).</div><div class="event_time">16:00 &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://math.ethz.ch/sam/news-and-events/zhacm-colloquia">Zurich Colloquium in Applied and Computational Mathematics</a></div><br /><div class="event_speaker">Prof. Dr. Cristinel Mardare (Sorbonne Université)</div><div class="event_title">On the divergence equation and its relation to Korn’s inequalities</div><div class="event_time">16:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, October 10      </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/zahlentheorie/">Seminar Zahlentheorie</a></div><br /><div class="event_speaker"> Stefan Kebekus (Universität Freiburg)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/number-theory-seminar-stefan-kebekus-universitaet-freiburg/">Title T.B.A.</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Title: Extension Theorems for differential forms and applications Abstract: We present new extension theorems for differential forms on singular complex spaces and explain their use in the study of minimal varieties. We survey a number of applications, pertaining to classification and characterisation of special varieties, non-Abelian Hodge Theory in the singular setting, and quasi-étale uniformization. Location: Hörsaal 114, Kollegienhaus Please carefully note the unusual time and location.</div><div class="event_time">10:45 &bull; Universität Basel</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://memento.epfl.ch/maths/">External FLAIR Seminar </a></div><br /><div class="event_speaker"> Juan Pardomo (Harvard)</div><div class="event_title">The Relative Value of Prediction <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Algorithmic predictions are increasingly used to inform the allocations of goods and services in the public sphere. In these domains predictions serve as a means to an end. They provide stakeholders with insights into the likelihood of future events in order to improve decision making quality and enhance social welfare. However if maximizing welfare is the question to what extent is improving prediction the best answer?  In this talk I will discuss various attempts to contextualize the relative value of algorithmic prediction in allocation problems through both theory and practice. The goal of the first part will be to formally understand how the welfare benefits of improving prediction compare to those of expanding access when distributing social goods. In the latter half I will present an empirical case study illustrating how these issues play out in the context of a risk prediction system used throughout Wisconsin public schools.</div><div class="event_time">13:15 &bull; EPF Lausanne, CM 14</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://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"> David Lilienfeldt (University of Leiden)</div><div class="event_title">Derivatives of Rankin-Selberg L-functions and heights of generalized Heegner cycles <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the 1980s, Gross and Zagier obtained a formula expressing the heights of CM points on modular curves in terms of derivatives of certain L-functions, leading to applications towards the Birch and Swinnerton-Dyer conjecture for elliptic curves. In this talk, I will present a formula for the heights of certain algebraic cycles first introduced by Bertolini, Darmon, and Prasanna. This formula generalizes the Gross-Zagier formula to higher dimensions and has applications to the Beilinson-Bloch-Kato conjectures, notably in the case of Jacobians with CM. This is joint work with Ari Shnidman.</div><div class="event_time">14:15 &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"> Lars Lorch (Institute for Machine Learning, ETH Zürich)</div><div class="event_title">Causal Modeling with Stationary Diffusions <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 develop a novel approach to causal modeling and inference. Rather than structural equations over a causal graph, we show how to learn stochastic differential equations (SDEs) whose stationary densities model a system\'s behavior under interventions. These stationary diffusion models do not require the formalism of causal graphs, let alone the common assumption of acyclicity, and often generalize to unseen interventions on their variables. Our inference method is based on a new theoretical result that expresses a stationarity condition on the diffusion\'s generator in a reproducing kernel Hilbert space. The resulting kernel deviation from stationarity (KDS) is an objective function of independent interest.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.1</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">Dr. William Hammersley (Université Côte d\'Azur)</div><div class="event_title">Rearranged Stochastic Heat Equation: A Regularising Infinite Dimensional Common Noise for Mean Field Models <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This talk will present a regularising diffusion in the space of square integrable probability measures over the reals. One begins by representing each probability measure via a uniquely chosen symmetric non-increasing random variable (over the circle) having that measure as its law under (unit-normalised) Lebesgue measure; this is akin to considering its quantile function representation. A diffusion on this space of functions is constructed via a discrete-in-time splitting scheme. Over one interval, one acts on the representative random variables (symmetrised quantiles) by an increment of stochastic heat driven by coloured noise, then at the end of the time interval, one transforms the output function to its symmetric non-increasing rearrangement. This operation ensures the Markovianity of the resulting evolution of the induced measures. The fine time-mesh limit of the schemes can be shown to admit a well-posed characterisation that we call the rearranged stochastic heat equation. This diffusion\'s regularisation effect is illustrated via its associated semigroup, which maps bounded functions to Lipschitz ones with an integrable small-time singularity for the Lipschitz constants. A simple-to-write minimisation problem of a non-convex functional of probability measure is used as a prototypical and motivational application for which the stochastic gradient descent driven by the rearranged stochastic heat is studied. Exponential convergence to a unique equilibrium is demonstrated under modest assumptions along with metastability properties exhibiting the same order as the finite dimensional setting. Time permitting, I will discuss open directions of inquiry. </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, October 11      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_dis"><a class="external" href="https://unidistance.ch">UniDistance</a></div><div class="event_type"><a class="external" href="https://unidistance.ch/en/mathematics-and-computer-science/event/swiss-number-theory-days-2024">Number Theory Days</a></div><br /><div class="event_speaker"> Sarah Peluse (Michigan)</div><div class="event_speaker"> Victor Rotger (Barcelona)</div><div class="event_speaker"> Michael Stoll (Bayreuth)</div><div class="event_speaker"> Jan Vonk (Leiden)</div><div class="event_speaker"> Jessica Fintzen (Bonn)</div><div class="event_title">Swiss Number Theory Days 2024 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Swiss Number Theory Days will be held on the 11th and 12th of October 2024 at UniDistance Suisse in Brig (Wallis).The Swiss Number Theory Days (NTD) is a joint annual seminar organised the number theory research groups at several Swiss universities, previously held at EPFL, ETH, and Basel. The 2024 meeting will be hosted for the first time by UniDistance, at our campus in Brig (VS).There will be 5 one-hour talks over a Friday afternoon and the following Saturday morning. Dinner will be provided on Friday evening, and an optional lunch and excursion hike on Saturday afternoon.</div><div class="event_time">13:30 &bull; UniDistance</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/anmath/seminars/">Seminar of Analysis </a></div><br /><div class="event_speaker"> Florian Kogelbauer (ETH Zürich)</div><div class="event_title">Optimal Hydrodynamic Closure for Linear Boltzmann Equations</div><div class="event_time">14:15 &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/schools/sb/research/math/statistics-seminars/">Statistics Seminar </a></div><br /><div class="event_speaker"> Myrto Limnios (EPFL)</div><div class="event_title">Nonparametric Modeling and Penalized Learning Methods for Event Processes <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 disease progression analysis, estimating the causal effect of a time-continuous treatment assigned to a given population is an important problem. This is particularly relevant for understanding (causal) underlying phenomena in many applications gathering massive high-dimensional and time-dependent data structures, ranging from biomedicine to financial markets for instance. We propose, in this work, a nonparametric model for event processes, based on a linear combination of tensor products of kernel functions, composed of stochastic integrals w.r.t. the event processes observed up to a fixed time. Under some assumptions of sparse decomposition and adequate regularity, the optimal parameters involved in the expansion are solution of a LASSO penalized method. Finite-sample concentration bounds for the estimation and prediction errors are derived, yielding data-driven optimal weights for the LASSO penalty term, and allowing for heteroscedastic expansions. The results will be applied to propose a conditional local independence test with practical implementations, important to learning causal graphs in that setting. This is a joint work with Prof. Niels R. Hansen (UCPH). </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">Prof. Dr. Georg Oberdieck (Universität Heidelberg)</div><div class="event_title">Refined curve counting on the Enriques surface <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />An Enriques surface is the quotient of a K3 surface by a fixed point free involution. There are many intriguing questions about curve counting on the Enriques surface. After giving an overview, we will zoom in on refined curve counting on the local Enriques surface. We discuss both K-theoretic refinement (following Nekrasov-Okounkov) and motivic refinements (following Kontsevich-Soibelman). In particular, we will see a refinement of the Klemm-Marino formula. This investigation leads to some concrete predictions about the moduli space of stable sheaves on Enriques surfaces.</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 class="day">      <div class="day_title">        Saturday, October 12      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_dis"><a class="external" href="https://unidistance.ch">UniDistance</a></div><div class="event_type"><a class="external" href="https://unidistance.ch/en/mathematics-and-computer-science/event/swiss-number-theory-days-2024">Number Theory Days</a></div><br /><div class="event_speaker"> Sarah Peluse (Michigan)</div><div class="event_speaker"> Victor Rotger (Barcelona)</div><div class="event_speaker"> Michael Stoll (Bayreuth)</div><div class="event_speaker"> Jan Vonk (Leiden)</div><div class="event_speaker"> Jessica Fintzen (Bonn)</div><div class="event_title">Swiss Number Theory Days 2024 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Swiss Number Theory Days will be held on the 11th and 12th of October 2024 at UniDistance Suisse in Brig (Wallis).The Swiss Number Theory Days (NTD) is a joint annual seminar organised the number theory research groups at several Swiss universities, previously held at EPFL, ETH, and Basel. The 2024 meeting will be hosted for the first time by UniDistance, at our campus in Brig (VS).There will be 5 one-hour talks over a Friday afternoon and the following Saturday morning. Dinner will be provided on Friday evening, and an optional lunch and excursion hike on Saturday afternoon.</div><div class="event_time">13:30 &bull; UniDistance</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>';