var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-6"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-4"><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. 10</span>      <span style="float: right; text-align:right; width: 250px;">17.11 - 21.11.2025</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 17      </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"> Radu Vintan</div><div class="event_title">Online Edge Coloring: Sharp Thresholds</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://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">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"> Adrian Dawid (Cambridge University)</div><div class="event_title">Probability measures on the Hamiltonian diffeomorphism group  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />What is a random Hamiltonian diffeomorphism? In this talk, we will try to answer this question by constructing a family probability measure on the group of Hamiltonian diffeomorphisms. We will see that classical invariants such as the Hofer norm and spectral invariants become well-behaved random variables in this setting. Furthermore, these measures have (for suitable choices of parameters) several desirable properties, such as full support on Ham(M), explicit estimates of the measure of Hofer-balls, and well-behaved extensions to the world of C^0-symplectic geometry. Additionally, these measures behave like Gaussian measures in certain ways. After a careful review of the construction, we will review these properties and some open problems.Note: the seminar begins at 15:00 rather than 15:15.  The location is HG 19.2 and not the usual room.</div><div class="event_time">15:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</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"> Michele Salvi  (Università degli Studi di Tor Vergata, Rome)</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 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">Dr. Chia-Yu Chang (University of Toulouse)</div><div class="event_title"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Geometry of Tensors</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The exponent of matrix multiplication is one of the central open problems in complexity theory. It can be defined using the rank of certain tensors. In this talk, I will introduce the exponent of matrixmultiplication and explain its connection to tensor theory. I will discuss the most well-known approach to upper bounding the exponent: the laser method, originally introduced by Strassen in 1987. Several notions of tensor rank have been studied — such as tensor rank, subrank, geometric rank, and others — all of which generalize the usual matrix rank. I will explain how a deeper understanding of these measures contributes to improving upper bounds on the exponent of matrix multiplication via the laser method.</div><div class="event_time">17:15 &bull; Universität Bern, Sidlerstrasse 5, 3012 Bern, Room B6</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, November 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/annonces/groupes-geometrie">Groupes et Géométrie </a></div><br /><div class="event_speaker"> Zixiang Zhou (EPFL)</div><div class="event_title">Bounded cohomology of diffeomorphism groups <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />n 2021, Monod introduced a novel approach to prove the bounded acyclicity of abstract groups, which he successfully applied to Thompson\'s group F. This idea was further developed by N.Monod, S. Nariman, and F.F. Francesco, who combined it with tools from algebraic topology to compute the bounded cohomology of transformation groups of manifolds. A key application of their work is establishing the (un)boundedness of characteristic classes in the corresponding classifying spaces. In this talk I will briefly introduce Monod\'s observation, and show how to combine tools from algebraic topology, dfferential topology and group theory to compute the bounded cohomology of Diff(M), especially for M=S^n with n>3.</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"> Elvira Pérez Callejo (Universidad de Valladolid)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-algebra-and-geometry-elvira-perez-callejo-universidad-de-valladolid/">Calculation of polynomial first integrals of genus $g\\neq 1$ in plane foliations.</a> <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 present an algorithmic criterion for determining when, if the foliation is given by polynomials, it admits a polynomial first integral whose associated algebraic curve has genus $g\\neq 1$. We explore the restrictions that arise when considering a rational first integral that is not necessarily polynomial, how the algorithm works in practice, and some illustrative examples. This talk is based on joint work with Carlos Galindo and Francisco Monserrat.</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_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"> Jörg Nick</div><div class="event_title">Developments and challenges for the numerical analysis of time- modulated metamaterials <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Time-modulated metamaterials have emerged as a focal point in the pursuit of next-generation materials. The talk discusses numerical investigation of acousticwave propagation in obstacles with periodically time-modulated material parameters. The first part of the talk discusses the numerical construction of Floquet–Bloch solutions, which are quasi-periodic kernel elements of the hyperbolic operator appearing on the left-hand side of the acoustic wave equation. Using the temporal Fourier expansion yields a system of coupled harmonics, which can be truncated. Instead, or in addition, we employ a general Galerkin space discretization to discretize in space. Some basic properties of the fully discretized modes can be shown and the convergence to the space or time-discretization can be established.Complications in the theory, however, limit the connection to the fully continuous modulated wave equation when formulated as an initial value problem. A modification of the Floquet–Bloch approach yields modulated Fourier expansion for fast-time modulated media. For modulations with small amplitude, the solution of the time-modulated acoustic wave equation can be characterized by several slowly varying coefficient functions. As a consequence, we can derive fully discrete schemes that converge, under assumptions on the modulation, independently of the rapid oscillation of the physical parameters. Numerical experiments illustrate both approaches.</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://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"> Xinchen Miao (Bonn)</div><div class="event_title">The Weyl bound for triple product L-functions in the cubic level <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Subconvexity estimation is one of the most important and challenging problem in the field of analytic number theory and L-functions. In this talk, we will focus on the strong subconvexity boundin the level aspect. I will report on my recent joint work with Dr. H. Zhang which achieves the Weyl-type bound for triple product L-functions in the cubic level case. Our method is a combination of different tools inclassical analytic number theory, automorphic forms and representation theory.</div><div class="event_time">14:00 &bull; EPF Lausanne</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"> Johannes Broedel (ETH Zurich)</div><div class="event_title">Towards constructing single-valued elliptic polylogarithms <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Single-valued polylogarithms make an appearance in various calculations of observables in quantum field theory and string theory. While the construction of classical single-valued polylogarithms was established by Brown, I will report on recent progress in lifting the algorithm to the elliptic curve. Similar to the classical case, the precise combination of multi-valued elliptic polylogarithms yielding single-valued polylogarithms is determined by demanding triviality of monodromies for solutions to the Knizhnik-Zamolodchikov-Bernard equation, which can be expressed using Enriquez\' A- and B-associators.</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_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"> Cristina Trombetti (University of Naple (Italy))</div><div class="event_title">Symmetrization Techniques for Elliptic Problems with Robin Boundary Conditions <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We discuss recent developments in the theory of symmetrization for elliptic partial differential equations subject to Robin-type boundary conditions.While classical symmetrization arguments are well understood in the Dirichlet and Neumann settings, the Robin case presents several new challenges. In this talk I will present sharp comparison results for solutions of elliptic problems with Robin boundary conditions. Applications to spectral inequalities will also be discussed.</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://www.epfl.ch/labs/mathicse/">Computational Science and Engineering </a></div><br /><div class="event_speaker"> Jørgen S.  Dokken  (Simula Research Laboratory)</div><div class="event_title">Multidimensional modelling in DOLFINx <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 give an introduction to the latest version of the FEniCS project, often called DOLFINx.First, the talk will focus on what sets DOLFINx apart from the old (legacy) version of the FEniCS Project, with particular focus on scalability on HPC systems.Secondly, we will cover applications where PDEs are posed over multiple spatial dimensions, for both conforming and non-conforming grids.</div><div class="event_time">16:15 &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://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">Nis-Erik Bohne (Institut für Mathematik, Universität Zürich)</div><div class="event_title">What is ... a-posteriori error estimation? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>Error analysis is a integral part of numerical mathematics. The classical way of doing this- called apriori error analysis- only provides an asymptotic result that involves the exact solution, which is generally unknown, and requires some regularity assumptions on the exact solution. Therefore the a-priori analysis only provides a qualitative result. A-posteriori error analysis on the other hand does not require any regularity assumptions nor any knowledge of the exact solution and provides a computable upper bound to the error.&lt;/p> &lt;p>In this talk we will be considering the Poisson model problem in 2d and use the finite element method to approximate the exact solution. We then will develop an a-posteriori error estimator from first principles and prove that this estimator truly is an upper bound to the error. We will then use the error estimator to motivate an adaptive mesh refinement strategy for approximating solutions with point singularities in order to recover optimal convergence rates. The talk closes by a short discussion on an open problem in the field of adaptive finite element methods.&lt;/p></div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, November 19      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Prof. Dr. Federico Rodriguez-Hertz (Penn State University)</div><div class="event_title">Thermodynamic formalism for partially hyperbolic systems with isometric central dynamics and applications <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>in joint work with Pablo Carrasco we push the theory of<br>thermodynamic formalism from hyperbolic systems to partially<br>hyperbolic systems in different forms. In the meantime we find several<br>interesting open problems and dynamical proofs of some (to us)<br>interesting results,, for example we show Burger-Monod theorem on<br>vanishing of second bounded cohomology for higher rank lattices. The&nbsp;goal of the talk is to discuss this development.&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/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Jean Raimbault (Marseille)</div><div class="event_title">Arithmetic link complements <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Two classical constructions of cusped hyperbolic 3&ndash;manifolds of finite volume are (some) link complements in the sphere, and quotients of hyperbolic space by congruence subgroups of Bianchi groups such as PSL<sub>2</sub>(<b>Z</b>[i]). A conjecture of Baker and Reid posits that only finitely many manifolds occur as both. I will discuss this conjecture in relation with well-known and conjectured properties of arithmetic groups, and present a proof of the conjecture obtained in joint work with S. Kionke.</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_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.imsv.unibe.ch/research/talks/colloquia/index_eng.html">Colloquia on Probability and Statistics </a></div><br /><div class="event_speaker"> Francesco Triggiano (Scuola Normale Superiore, Pisa)</div><div class="event_title"><a class="external" href="https://www.imsv.unibe.ch/research/talks/schedule/index_eng.html">Optimization schemes: A stochastic analysis 	view</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The remarkable success of machine learning (ML) models stems from their versatility across a wide range of tasks. Since their emergence, their continually increasing efficacy has been strongly linked to the clever adaptation of classical mathematical concepts and techniques. Optimization schemes, such as Gradient Descent (GD) and Stochastic Gradient Descent (SGD), are prime examples of established mathematical ideas that play a pivotal role in training these models.The high-dimensional nature of modern ML models, often comprising millions of parameters, requires optimization algorithms to navigate a correspondingly complex, high-dimensional, and often non-convex loss landscape. Therefore, analyzing and comparing the specific training dynamics, or the evolution of parameters, produced by different optimization schemes poses a significant theoretical challenge.Within this context, the Stochastic Modified Equations (SME) framework introduces the right tools and ideas to approximate Stochastic Optimization schemes through Stochastic differential equations (SDEs). Identifying and analyzing these SDEs allow to shed light on strengths and criticalities of popular optimization algorithms, such as SGD  and adaptive schemes.</div><div class="event_time">16:15 &bull; Universität Bern, IMSV, Alpeneggstrasse 22, 3012 Bern, Hörraum -203</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. Max Xu ( Courant Institute NYU)</div><div class="event_title">Primes Make Random Walk Chaotic <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In recent years, probability theory has made a big impact on making progress on many long-standing problems in number theory, and many exciting new probabilistic problems have naturally emerged with strong arithmetic motivations. In this talk, I will tell you part of the story of their interactions. Many of the connections can be summarized as a random walk problem, but with influences from primes. You may find the story interesting if any of the following keywords catch your attention: the Ballot problem, Log-correlated fields, Gaussian multiplicative chaos, Fydorov-Hiary-Keating conjecture, Polya\'s conjecture, random polynomials, distribution of primes. </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 20      </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_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">Prof. Dr. Marco Mondelli (ISTA)</div><div class="event_title">Precise Asymptotics for Spectral Estimators: A Story of Phase Transitions, Random Matrices and Approximate Message Passing <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Spectral methods are a simple yet effective approach to extract information from data which is high-dimensional, i.e., where sample size and signal dimension grow proportionally. As a prelude, we will consider the prototypical problem of inference from a generalized linear model with an i.i.d. Gaussian design. Here, the spectral estimator is the principal eigenvector of a data-dependent matrix. We will discuss the emergence of a (BBP-like) phase transition in the spectrum of this random matrix and how such phase transition is related to signal recovery. The core of the talk will then deal with two models that capture the heterogeneous and structured nature of practical data. First, we will consider a multi-index model where the output depends on the inner product between the feature vector and a fixed number $p$ of signals, and the focus is on recovering the subspace spanned by the signals via spectral estimators. By using tools from random matrix theory, we will locate the top-$p$ eigenvalues of the spectral matrix and establish the overlaps between the corresponding eigenvectors (which give the spectral estimators) and a basis of the signal subspace. Second, we will consider a generalized linear model with a correlated design matrix. Here, the analysis of the spectral estimator relies on tools based on approximate message passing, and we will present a methodology which is broadly applicable to the study of spiked matrices. In all these settings, the precise asymptotic characterization we put forward enables the optimization of the data preprocessing, thus allowing to identify the spectral estimator that requires the minimal sample size for signal recovery.</div><div class="event_time">14:15 &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_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"> Sasha  Merkurjev</div><div class="event_title">Inverse Galois Problem and Galois cohomology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A central issue in modern Galois theory is the profinite inverseGalois problem, which asks how to characterize absolute Galois groups offields among all profinite groups. While an answer to this question isunknown, even conjecturally, several necessary conditions for a profinitegroup to qualify as an absolute Galois group have been established.The most classical result in this direction is due to Artin and Schreier, whoproved thatevery non-trivial finite subgroup of an absolute Galois group is cyclic oforder 2.A much deeper necessary condition is the Bloch-Kato conjecture, now a theoremdue to Voevodsky and Rost, which in particular implies that the mod pcohomology ring of an absolute Galois group of a field containing aprimitive p-th root of unity is generated in degree 1 with relations in degree2.In the lecture, we will discuss restrictions to the profinite inverse Galoisproblemcoming from the embedding problem with abelian kernel and negligible classes inGalois cohomology. In particular, the lifting problem modulo p^2 of Galoisrepresentations over Z/pZ will be discussed.This is a joint work with Federico Scavia.</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_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"> Marc Abboud (University of Neuchâtel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/number-theory-seminar-marc-abboud-university-of-neuchatel/">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: On the rigidity of periodic points for automorphisms of affine surfaces Abstract: I will discuss the following results. Let S be a complex affine surface and f,g be two automorphisms of positive entropy. If f and g have a Zariski dense set of periodic points in common then they have the same set of periodic points. The proof uses the dynamics at infinity of such automorphisms and the construction of their canonical Green functions and equilibrium measures both for archimedean places and non-archimedean ones. One of the main ingredients is the theorem of arithmetic equidistribution on adelic line bundles over quasiprojective varieties from Yuan and Zhang. I will also discuss examples of affine surfaces where I manage to show a stronger rigidity: having the same periodic points imply that the automorphisms share a common iterate. The examples are the affine plane and Markov surfaces which are related to the character variety of the punctured torus.</div><div class="event_time">14:15 &bull; Universität Basel</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/mathicse/">Computational Science and Engineering </a></div><br /><div class="event_speaker"> Alex   Ferrer (CIMNE, Universitat Politècnica de Catatlunya, Barcelona)</div><div class="event_title">Additive manufacturing constraints in Topology optimization <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Additive manufacturing has motivated the development of new constraints in topology optimization to ensure the manufacturability of optimized designs. This work reviews and compares several important classes of constraints, considering both density-based and level-set methods. First, the perimeter constraint and its anisotropic extension are discussed as ways to control the complexity of boundaries and the orientation of features, which is relevant for directional manufacturing processes. The overhang constraint directly addresses the need to limit unsupported regions, a key issue in layer-by-layer fabrication. Minimum length scale control ensures the elimination of excessively small features that are impractical to fabricate and helps avoid mesh dependency. Connectivity constraints play a crucial role in guaranteeing that optimized structures remain manufacturable and free of disconnected components. In this context, we propose solving an auxiliary problem that enforces connectivity by penalizing or eliminating isolated regions, thus ensuring structural integrity. Both density and level-set formulations are examined, highlighting how these constraints can be integrated and the advantages and limitations of each approach. The study emphasizes that an appropriate combination of these constraints is essential to bridge the gap between mathematically optimal designs and physically realizable additive manufacturing components.</div><div class="event_time">14:45 &bull; EPF Lausanne, CM 1 106</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://stat.ethz.ch/events/zukost">ZueKoSt: Seminar on Applied Statistics</a></div><br /><div class="event_speaker"> Léo Belzile  (HEC Montréal)</div><div class="event_title">Choosing the threshold in extreme value analysis <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Univariate extreme value analysis often focus on observations that are large in the sense that they exceed a large threshold, above which observations are approximately generalized Pareto distributed under mildassumptions. The choice of threshold has a large impact on inference and its uncertainty is often ignored in subsequent analysis. Starting with the statistical properties underlying the various proposals, this talkprovides an extensive review of threshold selection mechanisms, including semiparametric methods based on Hill’s estimator, visual diagnostics, goodness-of-fit tests, extended generalized Pareto models,among others. We perform an extensive simulation study under various tail regimes, with serial dependence and varying sample sizes, to identify the most promising methodologies. Methods are showcased on the Padova rainfall series and we provide critical assessment of methods strengths and weaknesses. This presentation is based on joint work withSonia Alouini (MeteoSwiss) and Anthony Davison (EPFL).</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://www.epfl.ch/labs/mathicse/">Computational Science and Engineering </a></div><br /><div class="event_speaker"> Joaquín A.  Hernández  (CIMNE, Universitat Politècnica de Catatlunya, Barcelona)</div><div class="event_title">Empirical Interscale Finite Element Method (EIFEM): a data-driven multiscale framework for nonlinear heterogeneous structures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Empirical Interscale Finite Element Method (EIFEM) is a data-driven multiscale approach for efficient simulation of nonlinear heterogeneous and architected materials. It integrates domain decomposition, reduced-order modeling, and hyperreduction to connect fine- and coarse-scale responses with high accuracy.Each subdomain displacement is split into interface-induced and orthogonal nonlinear “bubble” components, the latter serving as internal coarse degrees of freedom. These are parametrized by linear or nonlinear expansions (e.g., POD or neural-network-based). EIFEM uses a three-field variational formulation with Localized Lagrange Multipliers, where user-defined interface modes act as coarse-scale boundary DOFs. This formulation establishes a direct mapping between coarse displacements and fine stresses, removing the need for FE²-type nested iterations and ensuring compatibility with standard FEM codes.Computational efficiency is achieved through the Continuous Empirical Cubature Method (CECM), which builds sparse integration rules for accurate reduced integration. Applications to nonlinear beams and metamaterial lattices demonstrate over three orders-of-magnitude reduction in unknowns and integration points while preserving strain-energy errors below 1%.</div><div class="event_time">15:30 &bull; EPF Lausanne, CM 1 106</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"> Danica Kosanovic (Universität Bern)</div><div class="event_title">Knotted families from graspers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will introduce a geometric object called a grasper, and explain how it gives rise to families of embeddings of an arc or a circle into an arbitrary manifold of any dimension. These families are detected by Goodwillie—Weiss embedding calculus, so the question of their nontriviality is reduced to algebraic topology. In dimension 3 our discussion reduces to constructions of knots using gropes/claspers.</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_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"> Susan Hermiller (University of Nebraska)</div><div class="event_title">Unknotting number is not additive under connected sum</div><div class="event_time">16:15 &bull; <a class="external" href="https://u-paris.zoom.us/j/87853056962">online</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/annonces/groupes-geometrie">Groupes et Géométrie </a></div><br /><div class="event_speaker"> Martin  Deraux  (Institut Fourier, Grenoble)</div><div class="event_title">Complex hyperbolic surfaces of finite volume <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will survey the known constructions of lattices in the isometry groups of the complex hyperbolic plane (explicit generating sets and fundamental domains, arithmetic groups, uniformization), and explain how to relate some specific examples produced using these three very different constructions.</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://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Dr. Vedran Sohinger (University of Warwick)</div><div class="event_title">Gibbs measures as local equilibrium Kubo-Martin-Schwinger states for focusing nonlinear Schrödinger equations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; background-color: white; margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;">Gibbs measures for nonlinear dispersive PDEs have been used as a fundamental tool in the study of low-regularity almost sure global well-posedness of the associated Cauchy problem following the pioneering work of Bourgain in the 1990s. In the first part of the talk, we will discuss the connection of Gibbs measures with the classical Kubo-Martin-Schwinger (KMS) condition. The latter is a property characterizing equilibrium measures of the Liouville equation.&nbsp; In particular, we show that Gibbs measures are the unique&nbsp;KMS&nbsp;equilibrium states for a wide class of Hamiltonian PDEs, including nonlinear Schr&ouml;dinger equations with defocusing interactions. Our proof is based on Malliavin calculus and Gross-Sobolev spaces. This is joint work with Zied Ammari (University of Besan&ccedil;on, Bourgogne-Franche-Comt&eacute;).&nbsp;&lt;/div> &lt;div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; background-color: white; margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;">&nbsp;&lt;/div> &lt;div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; text-align: left; background-color: white; margin: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: black;">In the second part of the talk, we study (local) Gibbs measures for focusing nonlinear Schr&ouml;dinger equations. These measures have to be localized by a truncation in the mass in one dimension and in the Wick-ordered (renormalized) mass in dimensions two and three. We show that local Gibbs measures correspond to suitably localized KMS states. This is joint work with Andrew Rout (Politecnico di Milano) and Zied Ammari (University of Besan&ccedil;on, Bourgogne-Franche-Comt&eacute;).&lt;/div></div><div class="event_time">17:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</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://www.math.ethz.ch/mathematik-und-ausbildung/weiterbildung/kolloquium.html">Kolloquium über Mathematik, Informatik und Unterricht</a></div><br /><div class="event_speaker"> Fabian Ziltener (ETH Zürich)</div><div class="event_title">Variationsrechnung, Symmetrien und Erhaltungssätze <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /><br /><br /><a href="https://math.ethz.ch/content/dam/ethz/special-interest/math/math-ausbildung-dam/documents/kolloquium/Ziltener_Variationsrechnung_Symmetrien_und_Erhaltungssaetze.pdf">Präsentation</a><br /></div><div class="event_time">17:15 &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">Prof. Dr. Jonathan Ziveyi (University of New South Wales)</div><div class="event_title">Efficient decumulation strategy with long-term care insurance and guaranteed minimum death benefit <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />With the global shift from defined benefit to defined contribution pension systems, retirement planning is now fully borne on individuals elevating their exposure to longevity, health, and market risks. This transition has prompted more precautionary saving behaviour, as retirees become more conservative in fully consuming their wealth. This research proposes a decumulation strategy which combines long-term care insurance (LTCI) and guaranteed minimum death benefit (GMDB) purchased at retirement with a withdrawal-then-rebalance investment approach. Within this framework, the retirement fund is modelled using a regime-switching structure, while a target volatility strategy detects asset allocation to smooth wealth dynamics and reduces likelihood ofextreme losses. The LTCI covers late-life healthcare costs, whereas the GMDB secures a minimum bequest, thereby supporting both consumption confidence and legacy objectives. Numerical experiments compare consumption patterns under this strategy with default account-based pension drawdown strategies. Results reveal that the proposed strategy provides smoother long-term consumption and better resilience to adverse financial shocks. Sensitivity analyses exploringvariations in insurance allocation ratios, health state transitions, and target volatility levels are performed. Preliminary results suggest that moderate volatility targets strike an effective balance between risk and sustainability, and that the strategy remains robust across different health scenarios. Joint work with Jennifer Alonso-Garcia, Mengdie Hu and Yuxin Zhou. </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 21      </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.unil.ch/dsa/en/home/menuinst/seminaires--evenements/research-seminars.html">Talks in Actuarial Mathematics </a></div><br /><div class="event_speaker"> Jonathan Ziveyi (UNSW Sidney)</div><div class="event_title">Optimal decumulation strategy with long-term care insurance and guaranteed minimum death benefit <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />With the global shift from defined benefit to defined contribution pension systems, retirement planning is now fully borne on individuals elevating their exposure to longevity, health, and market risks. This transition has prompted more precautionary saving behavior, as retirees become more conservative in fully consuming their wealth. This research proposes a decumulation strategy which combines long-term care insurance (LTCI) and guaranteed minimum death benefit (GMDB) purchased at retirement with a withdrawal-then-rebalance investment approach. Within this framework, the retirement fund is modelled using a regime-switching structure, while a target volatility strategy detects asset allocation to smooth wealth dynamics and reduces likelihood of extreme losses. The LTCI covers late-life healthcare costs, whereas the GMDB secures a minimum bequest, thereby supporting both consumption confidence and legacy objectives. Numerical experiments compare consumption patterns under this strategy with default account-based pension drawdown strategies. Results reveal that the proposed strategy provides smoother long-term consumption and better resilience to adverse financial shocks.Sensitivity analyses exploring variations in insurance allocation ratios, health state transitions, and target volatility levels are performed. Preliminary results suggest that moderate volatility targets strike an effective balance between risk and sustainability, and that the strategy remains robust across different health scenarios. This is joint work with Jennifer Alonso-Garcia, Mengdie Hu and Yuxin Zhou.Seminar organized by Prof. Hansjoerg Albrecher</div><div class="event_time">14:00 &bull; EPF Lausanne, Extranef 126</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. Pierre Charollois (Sorbonne Université)</div><div class="event_title">On Eisenstein Jugendtraum for complex cubic fields <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the early 2000s Giovanni Felder and his collaborators began the group-theoretic study of the elliptic gamma function, a remarkable multivariable meromorphic q-series arising from mathematical physics. In particular they obtained a collection of modular functional equations under the group SL3(Z) which make it a higher-dimensional analogue of the Jacobi theta function. In this work, we unveil the significance that this function and its variants have in number theory. Our main thesis is that these functions play the role of modular units in extending the theory of complex multiplication to complex cubic fields. In other words we propose a conjectural solution to Hilbert’s 12th problem for complex cubic fields, following a line of research actually initiated by G. Eisenstein. We give substantial numerical evidence that support this conjecture, and relate it to the Stark conjecture by proving an analogue of the Kronecker limit formula in this cubic setting. If times permits, I will also mention ongoing generalizations to SLn(Z), n>3, as part of Pierre Morain\'s PhD work at Sorbonne Université.This is joint work with Nicolas Bergeron and Luis Garcia.</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"> Karl Johan  Douglas Svensson Seth (NTNU Trondheim (Norway))</div><div class="event_title">Asymmetric Travelling Capillary-Gravity Waves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Periodic travelling waves that solve the capillary-gravity Whitham equation have been fully characterised in the case of small and even waves. This characterisation is complemented by the work presented in this talk dealing with small asymmetric periodic travelling waves. Such asymmetric waves are far more scarce than the even ones and can only be constructed in certain cases for weak surface tension. The method also generalises in a straightforward way to a class of similar equations for which we either can prove the existence of or non-existence of asymmetric solutions. However, the proof relies on some technical calculations that are different for each equation. We discuss how this can be done for the Babenko equation, which is equivalent to the full water wave problem, to determine the existence of small amplitude Capillary-Gravity Waves.</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"> Genevera Allen (Columbia University)</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">Prof. Dr. Georg Oberdieck (Universität Heidelberg)</div><div class="event_title">On the multiple cover formulas for K3 and abelian surfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />It has been conjectured that the Gromov-Witten invariants of a K3 or abelian surface for arbitrary curve classes are determined by those for primitive curve classes by a very simple multiple cover rule. The primitive invariants in turn are known, so the conjecture would determine the entire Gromov-Witten theory of K3 and abelian surfaces. In this talk I will report on joint work in progress with Rahul Pandharipande in which we aim to prove this conjecture.</div><div class="event_time">16:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>      </div>    </div>  </div>  <div id="sms_footer">    address: Alessandra Naldi Windler, Departement Mathematik, HG G 51.4, ETH Zurich, Raemistrasse 101, CH-8092 Zurich<br />    email: <a href="mailto:bulletin@math.ch">bulletin@math.ch</a> | phone: +41 44 632 3684 | url: <a href="https://math.ch">https://math.ch</a>    <br /><br /><img src="//www2.math.ethz.ch/smsjs/sms_logo.gif" width="150" alt="SMS/SMG Logo" title="SMS/SMG Logo" />  </div></div>';