var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-1"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=1"><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. 3</span>      <span style="float: right; text-align:right; width: 250px;">16.6 - 20.6.2025</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Summer Break 2025</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, June 16      </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://memento.epfl.ch/event/probability-and-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Bernard  Helffer</div><div class="event_title">On percolation on planar graphsAround the Helffer-Nourrigat conjecture (history, proof, open questions and applications) <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />After recalling the main advances in the study of hypoelliptic differential operators in the 1970’s, we will present how we came with Jean Nourrigat to the statement of our conjecture about the maximal hypoellipticity of polynomials of vector fields. This was recently proved by Ianivos Androulidakis, Omar Mohsen and Robert Yuncken with new techniques inspired by the Connes-Skandalis C*-algebraic approach. Then we will present the microlocal version of maximal hypoellipticity and recently studied applications related to PDE and mathematical physics problems.</div><div class="event_time">11:00 &bull; EPF Lausanne, Bernoulli Center</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, June 17      </div>      <div class="day_content">        <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"> Hui  Zhang (Xi\'an Jiaotong-Liverpool University)</div><div class="event_title">Fourier Analysis of Finite Difference Methods for the Helmholtz Equation <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Inspired by the work of Dwarka and Vuik on the pollution error, we show that Fourieranalysis can be used as a quantitative tool for estimating the accuracy of finite difference methodsfor the Helmholtz equation. In particular, for the classical 3-point central scheme for the 1DDirichlet problem, we show rigorously the exact order of convergence in $H^1$-norm is $k^3h^2$. Previously, Babuska, Sauter et al have established similar results for the linear FEM. We showsharpness of the order with two-sided bounds, and find also the order of relative errors for nonzerosource problems. As a visual tool, Fourier analysis make it straightforward to draw conclusions fromthe curve of error against frequency. For example, we use it to compare the accuracy of someoptimized finite difference methods.</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_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"> Igor  Rodionov (University of Essex)</div><div class="event_title">Extreme Kaplan-Meier integrals <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A novel and comprehensive methodology designed to tackle the challenges posed by extreme values in the context of random censorship is introduced. The main focus is onthe analysis of integrals based on the product-limit estimator of normalized upper order statistics, called extreme Kaplan–Meier integrals. These integrals allow for the transparentderivation of various important asymptotic distributional properties, offering an alternative approach to conventional plug-in estimation methods.Notably, this methodology demonstrates robustness and wide applicability among various tail regimes. A noteworthy by-product is the extension of generalized Hill-type estimators of extremes to encompass arbitrary tail behavior, which is of independent interest. The theoretical framework is applied to construct novel estimators for real-valued extreme value indices for right-censored data. Simulation studies confirm the asymptotic results and, in a competitor case, mostly show superiority in mean square error. An application to brain cancer data demonstrates that censoring effects are properly accounted for, even when focusing solely on tail classification. </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_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"> Yingxiang  Xu (Northeast Normal University, Changchun, China)</div><div class="event_title">Title T.B.A.</div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, June 18      </div>      <div class="day_content">        <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/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Benjamin Enriquez (Strasbourg)</div><div class="event_title">Double shuffle Lie algebra and special derivations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The pro-unipotent group DMR_0, which underlines the scheme of double shuffle relations satisfied by the multiple zeta numbers (Racinet 2002), is a subgroup of that of automorphisms of the free Lie algebra in two generators e_0 and e_1, sending e_1 to itself and e_0 to a conjugate. We show that DMR_0 is in fact contained in the subgroup of special automorphisms, i.e. which send e_\\infty:=-e_0-e_1 to a conjugate; and that it is invariant under the involution of the group of special automorphisms induced by the exchange of e_0 and e_\\infty. (Joint work with H. Furusho.)</div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, June 19      </div>      <div class="day_content">        <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"> Jean-François  Lafont (Ohio State University)</div><div class="event_title">High dimensional hyperbolic Coxeter groups that virtually fiber <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I\'ll explain how to construct hyperbolic Coxeter groups that virtually algebraically fiber (i.e. surject to Z with a finitely generated kernel), and that have arbitrarily high virtual cohomological dimension. Prior examples were only known to exist up to dimension eight. This is joint work with Minemyer, Sorcar, Stover, and Wells. </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_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://k-os.math.ethz.ch">[K-OS] Knot Online Seminar</a></div><br /><div class="event_speaker"> Marco Radeschi (Università degli Studi di Torino)</div><div class="event_title">Finiteness Theorem of isoparametric foliations with bounded geometry – a topological account <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Isoparametric submanifolds and foliations, in particular in round spheres, have been a historically fundamental concept in submanifold geometry that linked geometry, topology, and algebra. In this talk, I will survey these concepts underlying the rich history and applications, and will describe new results in joint work with A. Lytchak and M. Krannich. In the new work, we analyze the space of all isoparametric submanifolds on compact manifolds with uniformly bounded diameter, volume, and sectional curvature, and show that up to foliated diffeomorphism there are only finitely many such foliations. The talk will be tailored for topologically-minded people. Or at least, the tailor will do his best.</div><div class="event_time">16:15 &bull; <a class="external" href="https://u-paris.zoom.us/j/87853056962">online</a></div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, June 20      </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://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Ola  Svensson</div><div class="event_title">Language Generation in the Limit <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this talk, I want to talk about the aforementioned recent paper that I am excited about. It provides a concise and abstract definition of language generation, which already illustrates several interesting phenomena.While this talk focuses on the 2024 paper, several follow-up works have highlighted different aspects and led to the emergence of new open problems. In short, I think this is exciting, and there are likely many nice directions to pursue. Link to paper: https://papers.nips.cc/paper_files/paper/2024/hash/7988e9b3876ad689e921ce05d711442f-Abstract-Conference.htmlSome related follow-ups:- https://arxiv.org/abs/2411.09642- https://arxiv.org/pdf/2504.14370</div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Saturday, June 21      </div>      <div class="day_content">        <div class="day_content_item important"><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. Miguel Moreira (MIT)</div><div class="event_title">Wall-crossing for K-theoretic invariants via non-abelian localization <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />An important question with many practical applications in enumerative geometry is to understand how enumerative invariants attached to moduli spaces of sheaves/complexes/quiver representations change when we vary the stability condition. Wall-crossing for motivic invariants has been a central tool in Donaldson-Thomas theory of CY 3-folds. In a non-CY setting, more recently, Joyce developed a wall-crossing framework for cohomological invariants and Liu adapted his ideas to K-theoretic invariants. In this talk, I will explain a new approach to such wall-crossing formulas and an alternative way to define enumerative invariants in the presence of strictly semistable objects. This new framework extends the range of wall-crossing formulas we can prove, allowing us to deal for example with objects in the derived category of sheaves. This is joint work with Ivan Karpov.</div><div class="event_time">13:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item important"><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. Junliang  Shen (Yale)</div><div class="event_title">Cohomology of compactified Jacobians: Fourier transform and perverse filtration I <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Fourier transform has played a crucial role in the cohomological study of Jacobians over the decades. Recently, in efforts to understand the P=W conjecture for the Hitchin system, a theory of Fourier transform was developed for (possibly singular) compactified Jacobians, where the perverse filtration comes into play naturally. The purpose of these lectures is to explain some applications of this circle of ideas in the study of cohomology of the more classical compactified Jacobians associated with stable curves. The (in)dependence of the cohomology ring on the degree and the stability condition will be discussed. Based on joint work in progress with Younghan Bae and Davesh Maulik.</div><div class="event_time">14:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item important"><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. Qizheng Yin (Peking University)</div><div class="event_title">Cohomology of compactified Jacobians: Fourier transform and perverse filtration II <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Fourier transform has played a crucial role in the cohomological study of Jacobians over the decades. Recently, in efforts to understand the P=W conjecture for the Hitchin system, a theory of Fourier transform was developed for (possibly singular) compactified Jacobians, where the perverse filtration comes into play naturally. The purpose of these lectures is to explain some applications of this circle of ideas in the study of cohomology of the more classical compactified Jacobians associated with stable curves. The (in)dependence of the cohomology ring on the degree and the stability condition will be discussed. Based on joint work in progress with Younghan Bae and Davesh Maulik.</div><div class="event_time">15:45 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item important"><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"> Zhiyu Liu (Zhejiang Univeristy and ETH-ITS)</div><div class="event_title">Brill-Noether, Bogomolov-Gieseker, Bayer-Macri-Toda</div><div class="event_time">17:00 &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>';