var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-7"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-5"><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;">10.11 - 14.11.2025</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Autumn Semester 2025</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, November 10      </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"> Eva Miranda (Universitat Politècnica de Catalunya)</div><div class="event_title">Singular Symplectic Manifolds</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"> Jiyu Zhang</div><div class="event_title">Spectral clustering via the signless Laplacian, and beyond <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;/p>&lt;p>For a graph $G=(V,E)$, we study spectral graph theory for the associated signless Laplacian matrix, defined as $U = I + D^{-1/2}AD^{-1/2}$. Trevisan previously defined a notion called the bipartiteness ratio of a set and proved a Cheeger-type inequality that states the smallest eigenvalue of the signless Laplacian is close to 0 if and only if there exists a nearly bipartite component (i.e, a subset of small bipartiteness ratio) in the graph. We show that the spectral embedding using the first $k$ eigenvectors of $U$ not only enables clustering the vertices, but also provides indicators of how to assign $\\{-1,1\\}$ labels to vertices within each cluster, which allows us to find many disjoint subsets that are nearly bipartite. Using this observation we analyze a variant of the algorithm by Louis et al. We prove that our algorithm runs in randomized polynomial time and, for some absolute $c&gt;0$, with high probability can find $ck$ disjoint subsets $S_1, ..., S_{ck}$ such that the maximum bipartiteness ratio among these sets is at most $\\sqrt{\\mu_k} O(\\log k)$ where $\\mu_k$ is the $k$-th smallest eigenvalue of the signless Laplacian matrix.&lt;/p>&lt;p>At the end of the talk I will mention how to generalize these ideas to a class of  discrete magnetic Laplacian matrices.&lt;/p>&lt;p>Ongoing joint work with Salil Vadhan.&lt;/p></div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</div>        </div>        <div class="day_content_item cancelled"><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"> Eugenia Malinnikova (Stanford University)</div><div class="event_title">CANCELLED: Carleman estimates, unique continuation, and Landis conjecture</div><div class="event_time">13:15 &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/symplectic-geometry-seminar">Symplectic Geometry Seminar</a></div><br /><div class="event_speaker"> Giovanni Ambrosioni (ETH)</div><div class="event_title"> Approximability for spaces of Lagrangian submanifolds <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 will introduce a new notion of approximability for metric spaces that can be seen as a categorification of a concept introduced by Turing for metric groups and as a generalization of total-boundedness. I will explain how recent technological advances in symplectic topology and persistence category theory allow us to talk about approximablity of spaces of Lagrangian submanifolds and discuss applications to rigidity and complexity of Lagrangians, as well as potential relations to open problems in Lagrangian topology. This talk is based on joint work with Paul Biran and Octav Cornea.</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_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/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Cyril  Labbé (University Paris Cité)</div><div class="event_title">Title T.B.A.</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, November 11      </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"> Indira Chatterji (Université Côte d\'Azur)</div><div class="event_title">Espaces médians <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Un espace médian est un espace métrique géodésique tel que pour tous trois points il existe un unique point commun à trois géodésiques entre les trois paires de points. Les premiers exemples sont les R-arbres et leurs produits. Nous verrons des exemples d\'espaces médians en relation avec les actions de groupes, ainsi que en relation avec des questions plus appliquées. Cet exposé est accessible aux non-spécialistes.</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_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/algebraische-geometrie/">Seminar Algebra and Geometry</a></div><br /><div class="event_speaker"> Alice Garbagnati (Milano)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-algebra-and-geometry-alice-garbagnati-milano/">Specializations of symplectic and van Geemen--Sarti involutions</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The K3 surface are one of the two classes of Kähler surfaces which are endowed with a symplectic structure. An automorphism ? on a K3 surface X is called symplectic if it preserves this structure and if it has finite order, the desingularization of the quotient X/? is still a K3 surface, a priori different from X.So, one constructs a relation (the quotient by an automorphism) between different families of K3 surfaces. The families of projective K3 surfaces admitting a symplectic involution and the ones of their quotient are intensively studied in the last decades. In this talk, I will present the classical known results for the generic member of these families and then I consider specializations of some of them. In particular, I discuss the cases in which the K3 surface admitting the involution and its quotient are contained in the same family, and/or are isomorphic. The first and most famous example of this phenomenon is the one in which the symplectic involution is induced by a translation by a 2-torsion section on an elliptic fibration, i.e. it is a van Geemen--Sarti involution. We provide other examples and study specializations of both van Geemen--Sarti involutions and of the other ones presented.</div><div class="event_time">10:30 &bull; Universität Basel, Seminarraum 00.003, Spiegelgasse 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/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Eva Miranda (Universitat Politècnica de Catalunya)</div><div class="event_title">Singular Symplectic Manifolds</div><div class="event_time">13:15 &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_ne"><a class="external" href="https://unine.ch">Université de Neuchâtel</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=symplectic ">Geneva Neuchatel Symplectic Geometry Seminar (GeNeSyS)</a></div><br /><div class="event_speaker"> Oliver Edtmair (ETH Zürich)</div><div class="event_title">Volume filling ellipsoids <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> I will explain how to fill the full volume of any compact connected symplectic 4-manifold with smooth boundary with a single symplectic ellipsoid. This can be seen as a strong version of Biran’s famous packing stability theorem and has interesting consequences concerning the subleading asymptotics of various symplectic Weyl laws. The embedding construction relies on a quantitative refinement of Banyaga’s classical theorem on the simplicity and perfectness of Hamiltonian diffeomorphism groups, which I will also explain. Recently, Cristofaro-Gardiner and Hind constructed symplectic domains (with non-regular boundary) for which packing stability breaks down. I will explain some progress towards pinpointing the exact transition point between packing stability and failure thereof and mention open questions and conjectures.</div><div class="event_time">13:30 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room B217</div>        </div>        <div class="day_content_item cancelled"><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"> Adam Bobrowski (Chalmers, Lublin University Of Technology)</div><div class="event_title">CANCELLED: On Portenko\'s approximation of skew Brownian motion</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_dis"><a class="external" href="https://unidistance.ch">UniDistance Suisse</a></div><div class="event_type"><a class="external" href="https://unidistance.ch/en/mathematiques-et-informatique/recherche/number-theory/number-theory-seminar">Number Theory Seminar</a></div><br /><div class="event_speaker"> Hao  Peng  (MIT)</div><div class="event_title">The Bloch–Kato conjecture for polarized motives <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The (Beilinson-)Bloch–Kato conjecture vastly generalizes the rank part of the Birch–Swinnerton-Dyer conjecture for modular elliptic curves. Building on results of Liu-Tian-Xiao-Zhang-Zhu, we prove the Bloch-Kato conjecture at analytic rank zero for a large class of conjugate self-dual (unitary) motives, including those arising from odd symmetric powers of non-CM modular elliptic curves. As an application, we obtain families of nontrivial high-dimensional varieties for which the Hodge, Tate, and Bloch–Kato conjectures all hold for large \\ell, namely, powers of certain non-CM modular elliptic curves. If time permits, I will also discuss work in progress toward the Bloch-Kato conjecture at analytic rank at most one for certain standard and Rankin-Selberg orthogonal motives over Q, where an almost minimal R = T theorem for orthogonal Shimura varieties plays a crucial role.</div><div class="event_time">15:00 &bull; <a class="external" href="fernuni.zoom.us/my/davidloeffler">UniDistance Suisse</a></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/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Shon  Ngo  (IST Vienna)</div><div class="event_title">Hausel\'s big algebras, commuting differential operators and Bethe subalgebras of the Yangian of gl_n <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Recently, Hausel introduced the notion of a big algebra associated to a representation of a complex reductive Lie algebra. These algebras are commutative and capture a lot of representation-theoretic information, and are also related to the equivariant cohomology of certain singular varieties.In this work, we consider the case g=gl_n and apply the construction of big algebras to two special gl_n-modules, namely the symmetric and exterior algebras of the affine space of n\\times r matrices. We discuss some explicit formulas for generators of the corresponding big algebras in terms of differential operators with polynomial coefficients. Then, we explain how to use these formulas to relate type A big algebras to Bethe subalgebras of the Yangian Y(gl_n), and, as a by-product, reprove the commutativity of big algebras in type A.</div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ne"><a class="external" href="https://unine.ch">Université de Neuchâtel</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=symplectic ">Geneva Neuchatel Symplectic Geometry Seminar (GeNeSyS)</a></div><br /><div class="event_speaker"> Filip Brocic (Universität Augsburg)</div><div class="event_title">Parametric Gromov width in Liouville domains <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the talk, I will introduce the notion of the parametric Gromov width motivated by the classical camel theorem. The main theorem is a method how to bound the parametric Gromov width in the case of Liouville domains using the structure of the BV algebra on the persistence module that recovers symplectic cohomology. After presenting the theorem, I will cover main applications mainly using the string topology on cotangent bundles. In particular, I will give a new proof of the camel theorem using our methods. Time permitting, I will explain the method of the proof of the main theorem. This talk is based on the joint work with Dylan Cant.</div><div class="event_time">15:30 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room B217</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">Mattia Pozzoli (University of Bologna / INFN)</div><div class="event_title">What are... Feynman integrals? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p class="p1">Feynman integrals are ubiquitous in quantum field theory computations. I will review some of their properties and discuss modern methods for computing them, based on differential equations. The structure of these differential equations is linked to the underlying geometry of the integral. While Feynman integrals associated with the Riemann sphere are generally well understood, more complicated geometries appear in cutting-edge calculations. Despite significant progress in recent years, these functions defy available methods and remain the object of active study.&lt;/p> &lt;p class="p1">Finally, I will present an example of a cutting-edge calculation, of relevance for the analysis of experimental data from CERN&apos;s Large Hadron Collider, showing the interplay between analytic and algebraic complexity that challenges the available methods.&lt;/p></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_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/news-and-events/events/lecture-series/heinz-hopf-prize-and-lectures.html">Heinz Hopf Preis / Award ceremony and lecture</a></div><br /><div class="event_speaker"> Vladimir Sverak (University of Minnesota )</div><div class="event_title"><a class="external" href="https://math.ethz.ch/de/news-und-veranstaltungen/veranstaltungen/vortragsreihen/heinz-hopf-preis.html">Uniqueness Problems in PDEs Related to Fluids</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> Fluids are often thought of as continua, with their evolution governed by PDEs. In computational models, the PDEs are approximated by finite-dimensional truncations, leading to systems whose evolution for prescribed initial data are typically unique. What about the original PDEs? For smooth initial data and smooth solutions, the evolution can often be proved to be unique without much difficulty. The situation becomes more subtle when non-smooth objects are involved. In this talk, I will review both positive and negative results in this direction.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG , Room G 60</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, 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/news-and-events/events/lecture-series/heinz-hopf-prize-and-lectures.html">Heinz Hopf Symposium</a></div><br /><div class="event_speaker"> Klaus Widmayer (Universität Zürich)</div><div class="event_title">Global axisymmetric Euler flows with rotation <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We discuss the construction of a class of global, dynamical solutions to the 3d incompressible Euler equations near the stationary state given by uniform "rigid body" rotation. At the heart of this result is a dispersive effect due to rotation, which we present with some context.This is based on joint work with Y. Guo and B. Pausader (Brown University).</div><div class="event_time">10:15 &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/news-and-events/events/lecture-series/heinz-hopf-prize-and-lectures.html">Heinz Hopf Symposium</a></div><br /><div class="event_speaker">Prof. Dr. Thierry  Gallay  (University Grenobles Alpes )</div><div class="event_title">Interaction and Stabilizaion of Viscous Planar Vortices <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />As a model of the viscous interaction of planar vortices,we consider the solution of the two-dimensional Navier-Stokesequations with singular initial data corresponding to a finitecollection of point vortices. In the high Reynolds number regime, theevolution of the vortex centers is described, at least for smalltimes, by the classical Helmholtz-Kirchhoff system, and the vortexcores are slightly deformed due to the mutual interactions. Longertimescales can be reached in simple situations corresponding torelative equilibria of the point vortex system. For example, in thecase of a vortex dipole with opposite circulations, an acccurateapproximation of the solution can be constructed, which takes intoaccount the leading order correction to the translation speeddue to finite size effects. The evolution is similar for ill-preparedinitial data, corresponding to smooth and radially symmetric vortices,except that the solution first undergoes a short transient period duringwhich each vortex adapts its shape to the exterior strain.This talk relies on joint works with Martin Donati, Michele Dolce,and Vladimir Sverak.</div><div class="event_time">11:30 &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://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. Anshul Adve (Princeton University)</div><div class="event_title">Conformal bootstrap for hyperbolic surfaces and subconvexity <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>Given a compact hyperbolic surface of fixed topology, we consider its Laplace eigenvalues together with the structure constants for multiplication with respect to a suitable orthonormal basis of automorphic forms. These numbers obey algebraic constraints analogous to the conformal bootstrap equations in physics. In this talk I will present two results. The first is a converse theorem for these constraints: any collection of numbers satisfying the constraints must come from a hyperbolic surface. The second is an application of the constraints to subconvexity for triple product L-functions. This second result is joint with James Bonifacio, Petr Kravchuk, Dalimil Mazac, Sridip Pal, Alex Radcliffe, and Gordon Rogelberg. No knowledge of physics or L-functions will be assumed.&lt;/p></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"> Aitor Iribar López (ETH Zürich)</div><div class="event_title">Cohomology of the Satake compactification IV</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_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/news-and-events/events/lecture-series/heinz-hopf-prize-and-lectures.html">Heinz Hopf Symposium</a></div><br /><div class="event_speaker"> Elia  Brue (Bocconi University)</div><div class="event_title">Instability and Nonuniqueness in Incompressible Fluid Models <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The incompressible Navier–Stokes and Euler equations are central to mathematical fluid dynamics, yet their well-posedness theory remains one of the great open problems in PDEs. In recent years, remarkable progress has been made in constructing and understanding non-unique solutions to these equations, often revealing unexpected instability mechanisms. In this talk I will survey some of these developments and highlight connections with the pioneering contributions of Vladimir Sverák. </div><div class="event_time">14:30 &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_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/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Markus  Tempelmayr</div><div class="event_title">A priori bounds for stochastic porous media equations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We prove a priori bounds for solutions of stochastic porous media equations in their natural $L^1$- based regularity class, in a regime where the equation is both singular and degenerate. For simplicity we consider only a mildly singular regime, which allows to prove modelledness of the solution with respect to the solution of the corresponding linear stochastic heat equation. The proof relies on the kinetic formulation of the equation and a renormalized energy inequality. A careful analysis allows to balance the degeneracy of the diffusion coefficient against sufficiently strong damping of the multiplicative noise for small values of the solution.</div><div class="event_time">15:00 &bull; EPF Lausanne, Bernoulli Center</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/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Dr. Rati Ludhani (Inria Saclay Centre)</div><div class="event_title">Minimal Codewords of Projective Reed-Muller Codes of Order 2 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>Minimal codewords of a linear code reveal its important structural properties and are required, for instance, in secret-sharing schemes and certain decoding algorithms. A nonzero codeword is said to be minimal if its support does not properly contain the support of any other nonzero codeword. Determining minimal codewords of a general linear code is NP-hard, so one typically exploits the specific structure of a given code. Here, we consider this problem for projective Reed Muller (PRM) codes of order 2.&lt;/p> &lt;p>PRM codes of order 2 are evaluation codes obtained by evaluating quadratic forms over a finite field \\(F\\) at the \\(F\\)-rational points of the corresponding projective space. To characterize their minimal codewords, we reduce the problem to the following geometric question: given two quadrics such that the \\(F\\)-rational points of one are contained in the other, can they differ? Our main result is that for absolutely irreducible quadrics, this almost never happens. In this talk, we present a complete answer to this question, thereby classifying the minimal codewords of PRM codes of order 2.&lt;/p> &lt;p>This is joint work with Alain Couvreur.&lt;/p></div><div class="event_time">15:15 &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/news-and-events/events/lecture-series/heinz-hopf-prize-and-lectures.html">Heinz Hopf Symposium</a></div><br /><div class="event_speaker"> Vladimir Sverak (University of Minnesota)</div><div class="event_title">Three-vortex Dynamics and the Hopf Fibration <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />It it well-known that the dynamics of three point-vortices in the plane is integrable. The results go back to W. Groebli (1877), H. Poincare (1893), and others. Over the years, many perspectives on the topic have been developed. In this talk I will discuss a recent work with Thierry Gallay that approaches the computations from a geometric viewpoint based on the Hopf fibration. Our main motivation has been to understand the possibilities for regularizing three-vortex collisions.</div><div class="event_time">15:45 &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/daco-seminar">DACO Seminar</a></div><br /><div class="event_speaker"> Amit Rajaraman (MIT, US)</div><div class="event_title">Eigenvalue Bounds for Random Matrices via Zerofreeness <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 technique to prove bounds for the spectral radius of a random matrix, based on using Jensen\'s formula to establish the zerofreeness of the associated characteristic polynomial in a region of the complex plane. Our techniques are entirely non-asymptotic, and we instantiate it in three settings:(i) The spectral radius of non-asymptotic Girko matrices---these are asymmetric matrices M &#8712; &#8450;^{n × n} whose entries are independent and satisfy &#120124; M&#7522;&#11388; = 0 and &#120124; |M&#7522;&#11388;|² &#8804; 1/n.(ii) The spectral radius of non-asymptotic Wigner matrices---these are symmetric matrices M &#8712; &#8450;^{n × n} whose entries above the diagonal are independent and satisfy &#120124; M&#7522;&#11388; = 0, &#120124; |M&#7522;&#11388;|² &#8804; 1/n, and &#120124; |M&#7522;&#11388;|&#8308; &#8804; 1/n.(iii) The second eigenvalue of the adjacency matrix of a random d-regular graph on n vertices, as drawn from the configuration model.In all three settings, we obtain constant-probability eigenvalue bounds that are tight up to a constant. Applied to specific random matrix ensembles, we recover classic bounds for Wigner matrices, as well as results of Bordenave--Chafaï--García-Zelada, Bordenave--Lelarge--Massoulié, and Friedman, up to constants.</div><div class="event_time">16:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room D 1.1</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/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Prof. Dr. Alejandro José Giangreco Maidana (Faculty of Engineering, National University of Asunción)</div><div class="event_title">Cyclicity of the Group of Rational Points of Abelian Varieties Over Finite Fields and Totally Real Algebraic Integers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;div dir="auto">Vladuts characterized in 1999 the set of finite fields k such that all elliptic curves defined over k have a cyclic group of rational points. Under the conjecture of infinitely many Mersenne primes, this set is infinite.&nbsp;&lt;/div> &lt;div dir="auto">In this talk, I study the question in higher&nbsp;dimension. Precisely, I prove that there is no such fields. This is related with the existence of some totally real algebraic integers having some arithmetic properties.&lt;/div> &lt;div dir="auto">I am going to present a result about cyclicity of maximal&nbsp;abelian varieties as well, and how this is related to some&nbsp;totally positive algebraic integers.&lt;/div> &lt;div dir="auto">In both problems, open questions about totally real algebraic integers arise, some of which are addressed from an algorithm point of view.&lt;/div></div><div class="event_time">16:30 &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/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Dr. Catherine Cawley Wolfram (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Epstein curves and holography of the Schwarzian action <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The circle can be seen as the boundary at infinity of the hyperbolic plane. We give a 1-to-2 dimensional holographic interpretation of the Schwarzian action, by showing that the Schwarzian action (which is a function of a diffeomorphism of the circle) is equal to the hyperbolic area enclosed by an "Epstein curve" in the disk. A dimension higher, the Epstein construction was used to relate the Loewner energy (a function of a Jordan curve related to SLE and Brownian loop measures) to renormalized volume in hyperbolic 3-space.In this talk I will explain how to construct the Epstein curve, how the bi-local observables of Schwarzian field theory can be interpreted as a renormalized hyperbolic length using the same Epstein construction, and (time permitting) discuss a bit what we know so far about the relationship between the Schwarzian action and the Loewner energy. This is based on joint work with Franco Vargas Pallete and Yilin Wang.</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">        Thursday, November 13      </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"> Bo\'az Klartag (The Weizmann Institute of Science)</div><div class="event_title">Isoperimetric inequalities in high-dimensional convex sets</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"> Chirag Pabbaraju</div><div class="event_title">Exploring Facets of 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 />Recent work of Kleinberg and Mullainathan provides a concrete model for language generation in the limit: given a sequence of examples from an unknown target language, the goal is to generate new examples from the target language such that no incorrect examples are generated beyond some point. In sharp contrast to strong negative results for the closely related problem of language identification, they establish positive results for language generation in the limit for all countable collections of languages. Follow-up work by Li, Raman and Tewari studies bounds on the number of distinct inputs required by an algorithm before correct language generation is achieved -- namely, whether this is a constant for all languages in the collection (uniform generation) or a language-dependent constant (non-uniform generation). In this talk, we will see how every countable language collection has a generator which has the stronger property of non-uniform generation in the limit. We will also formalize the tension between validity and breadth in the generation algorithm of Kleinberg and Mullainathan, by introducing a definition of "exhaustive" generation, and show a strong negative result for exhaustive generation. Our result shows that a tradeoff between validity (no hallucinations) and breadth (coverage of the entire language) is inherent for language generation in the limit. Based on joint work with Moses Charikar: https://arxiv.org/abs/2411.15364 and https://www.arxiv.org/abs/2510.02795</div><div class="event_time">11:00 &bull; EPF Lausanne, BC 420</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPFL 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"> John Miller (Université de Montréal)</div><div class="event_title">Categorical fragmentation and filtered topology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will review notions of categorical complexity, and the more recent work of Biran, Cornea and Zhang on fragmentation in triangulated persistence categories (TPCs), then go on to discuss applications of this to filtered topology. In particular, we will consider a suitable category of filtered topological spaces and detail some constructions and properties, before showing that an associated \'filtered stable homotopy category\' is a TPC. I will then give some interesting results relating to this.</div><div class="event_time">16:00 &bull; <a class="external" href="https://plan.epfl.ch/?room==CM%201%20517">EPFL Lausanne, Mathematics</a></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"> Erika  Roldán  (MPI MIS)</div><div class="event_title">Topology and Geometry of Random Cubical Complexes <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 explore the expected topology (measured via homology) and local geometry of two different models of random subcomplexes of the regular cubical grid: percolation clusters and the Eden Cell Growth model. We will also compare the expected topology that these average structures exhibit with the topology of the extremal structures that it is possible to obtain in the entire set of these cubical complexes. You can have a look at some of these random structures here (https://skfb.ly/6VINC) and start making some guesses about their topological behavior.</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_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">Prof. Dr. Damir  Filipovic (EPFL )</div><div class="event_title">Kernel Density Machines <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We introduce kernel density machines (KDM), a nonparametric estimator of a Radon--Nikodym derivative, based on reproducing kernel Hilbert spaces. KDM applies to general probability measures on countably generated measurable spaces under minimal assumptions. For computational efficiency, we incorporate a low-rank approximation with precisely controlled error that grants scalability to large-sample settings. We provide rigorous theoretical guarantees, including asymptotic consistency, a functional central limit theorem, and finite-sample error bounds, establishing a strong foundation for practical use. Empirical results based on simulated and real data demonstrate the efficacy and precision of KDM.</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 14      </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"> Andrea Moiola (University of Pavia)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-in-numerical-analysis-andrea-moiola-university-of-pavia/">A space-time continuous and coercive formulation for the wave equation</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We propose a new space-time variational formulation for wave equation initial-boundary value problems. The key property is that the formulation is coercive (sign-definite) and continuous in a norm stronger than H1(Q), Q being the space-time cylinder. Coercivity holds for constant-coefficient impedance cavity problems posed in star-shaped domains, and for a class of impedance-Dirichlet problems. The formulation is defined using simple Morawetz multipliers and its coercivity is proved with elementary analytical tools, following earlier work on the Helmholtz equation. The formulation can be stably discretised with any H2(Q)-conforming discrete space, leading to quasi-optimal space-time Galerkin schemes. Several numerical experiments show the excellent properties of the method. We also present a continuous-interior-penalty variant, a posteriori error estimators, and adaptive discretisations. This is a joint work with Paolo Bignardi and Theophile Chaumont-Frelet. [1] Bignardi, Moiola, A space-time continuous and coercive formulation for the wave equation, Numerische Mathematik 2025. <a href="https://doi.org/10.1007/s00211-025-01478-3" target="_blank">https://doi.org/10.1007/s00211-025-01478-3</a> [2] Bignardi, Space-time Morawetz formulations for the wave equation, PhD thesis, University of Pavia 2025. <a href="https://iris.unipv.it/handle/11571/1519237" target="_blank">https://iris.unipv.it/handle/11571/1519237</a> For further information about the seminar, please visit this webpage .</div><div class="event_time">11:00 &bull; Universität Basel, Room 05.001, Spiegelgasse 5, 4051 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://math.ethz.ch/s/number-theory-seminar">Number Theory Seminar</a></div><br /><div class="event_speaker">Prof. Dr. K&#281;stutis  &#268;esnavi&#269;ius (Sorbonne Université)</div><div class="event_title">The Manin constant and the modular degree <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Manin constant c of an elliptic curve E over Q is the nonzero integer that scales the differential &#969; determined by the normalized newform f associated to E into the pullback of a Néron differential under a minimal parametrization \\phi : X_0(N) ---> E. Manin conjectured that c = ±1 for optimal parametrizations. We show that in general c | deg(\\phi), under a minor assumption at 2 and 3, which improves the status of the Manin conjecture for many E. Our core result that gives this divisibility is the containment &#969; &#8712; H^0(X_0(N), &#937;), which we establish by combining automorphic methods with techniques from arithmetic geometry (here the modular curve X_0(N) is considered over Z and &#937; is its relative dualizing sheaf over Z). To overcome obstacles at 2 and 3, we analyze nondihedral supercuspidal representations of GL_2(Q_2) and exhibit new cases in which X_0(N) has rational singularities over Z. The talk is based on joint work with Abhishek Saha and Michalis Neururer.</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 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"> Marc  Nualart Batalla ( ICMAT, Madrid)</div><div class="event_title">On the fragility of laminar flow <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Steady states of the two-dimensional Euler equations generally come in infinite-dimensional families and play an important role in the long-time dynamics of generic initial data. In this talk we will review several classes of steady states, focusing on laminar flow. We will show steady laminar flow in channels or annulus are shear/radial, while on other generic domains they are structurally rare.</div><div class="event_time">14:15 &bull; EPF Lausanne, MA B1 11</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"> Karthik Bharath (University of Nottingham)</div><div class="event_title">Title T.B.A.</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. Max Schimpf (MPI Bonn)</div><div class="event_title">Grothendieck topologies with log modifications <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Many notions in log geometry are invariant under log modification. To formalize this, we introduce the so-called m-type morphisms and their associated topologies and discuss their properties. In particular, this lead us to discover a mistake in the definition of the full log étale site introduced by Kazuya Kato and Fujiwara 30 years ago. Moreover, I will also present a fix for this problem. Time permitting, I will talk about applications of our topologies. All the above results are joint with Xianyu Hu.</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 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"> Sofia Wood (Columbia University)</div><div class="event_title">Hodge numbers of universal compactified Jacobians <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We study the universal compactified Jacobians of degree d, as constructed by Kass and Pagani over the moduli space of stable curves. These spaces compactify the universal degree-d Jacobian over the moduli of smooth curves, and depend on a choice of universal stability condition. I will discuss the proof of how the Hodge numbers of these compactified Jacobians are independent of both the degree d and the choice of stability condition. This is joint work with Rahul Pandharipande, Dan Petersen, and Johannes Schmitt.</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>  <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>';