var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-9"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-7"><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. 7</span>      <span style="float: right; text-align:right; width: 250px;">27.10 - 31.10.2025</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, October 27      </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/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Joel Schmitz (Neuchâtel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-joel-schmitz-neuchatel/">Nodal Tangles</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Presentation of doctoral thesis in symplectic geometry. We discuss what symplectic geometry is, with a particular focus on integrable systems and their origins in physics, and how to link them to the topic of my thesis, Almost Toric Fibrations. pdf_version</div><div class="event_time">t.b.a. &bull; Universität Basel</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://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_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"> Nikolas Adaloglou (Leiden University)</div><div class="event_title">Which symplectic forms on S2xS2 have Lagrangian Klein Bottles? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Using (almost) toric fibrations and their visible Lagrangians, we can construct many novel and interesting examples of Lagrangian submanifolds of symplectic four-manifolds. Naturally, one can ask whether visible Lagrangians are all the Lagrangians that exist, or, in other words, how faithful the pictures coming from almost toric fibrations are. I will answer this question for Klein bottles in $(S^2 \\times S^2,\\omega_{\\lambda})$, i.e. the product of two spheres where the first factor has area 1 and the other factor has area $\\lambda$. In particular, I will first construct a visible Lagrangian Klein bottle when $\\lambda &lt; 2$. Then I will show that no Lagrangian Klein bottles exist otherwise. The key input for obstructing the existence of the Klein bottles is Luttinger surgery along with techniques of (compact) pseudoholomorphic curves and Seiberg--Witten theory. This is joint work with J. Evans.</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/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Mike Cranston (University of California Irvine)</div><div class="event_title"> The Riemann Zeta Process <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A classical method  for sampling a random integer Y(N) according to the uniform distribution on [0,N] is to use the Riemann zeta distribution on the integers. That is, a random integer X(s) is sampled with probability of being n equal to 1/\\zeta(s)n^s, where s>1. Then the asymptotics of arithmetic functions of X(s) where s goes to 1 have been studied recently by myself, Peltzer, Mountford, Hsu and Khodiakova. The results are always the same as when one evaluates the arithmetic function at Y(N) and lets N go to infinity. A question comes up as to whether one can define a natural process X(s)  and whether such a process would shed any light on the nature of the integers being sampled. In this talk, we will discuss a natural method to produce such a process and explain its properties. This is joint work with Jingyuan Chen. </div><div class="event_time">16:15 &bull; EPF Lausanne, CM 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Catherine Wolfram (ETH Zürich)</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 discuss 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">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, October 28      </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"> Tsviqa  Lakrec (UNIGE)</div><div class="event_title">Quantitative equidistribution of random walks by automorphisms on nilmanifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />By a theorem of Bourgain-Furman-Lindenstrauss-Mozes, for any irrational starting point the random walk on a d-dimensional torus induced by the automorphism group GL(d,Z) approaches a uniform distribution at an exponential rate. The rate is quantified by diophantine properties of the starting point. I will report on an upcoming work with Weikun He and Elon Lindenstrauss that generalizes this theorem an d our previous result on Heisenberg nilmanifolds to random walks on 2-step nilmanifolds by automorphisms.</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"> Anne Schnattinger (Neuchâtel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-algebra-and-geometry-anne-schnattinger-neuchatel/">Weak Fano threefolds arising as the blowup of a hyperquadric in P^4 along a curve</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Given a smooth hyperquadric Y in P^4, we consider its blowup X along a smooth irreducible curve C contained in Y. We study the question, when X is a weak Fano threefold, that is, when it has a nef and big anticanonical divisor. We are able to give a complete classification of such threefolds only depending on some geometric properties of C, particularly its genus and degree. We introduce the main proof ideas which include the analysis of the linear system given by the anticanonical divisor of X, as well as studying curves contained in a smooth K3 surface of degree 6.</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"> Adrien  Busnot Laurent (INRIA Rennes)</div><div class="event_title">On the composition of exponentials and the numerical integration of differential equations on manifolds  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The composition of matrix exponentials is well understood through the BCH formula and the use of the inverse differential of the exponential map dexp^{-1}. We will consider a similar problem from the geometric perspective with the composition of geodesic exponential, defined by a general affine connection. Using geometric arguments, we describe the Taylor expansion of the equivalent of dexp^{-1}, a geometric BCH formula, and apply the approach for the creation of numerical integrators on manifolds, equipped with any geometry. The approach is motivated by ongoing works on stochastic numerics on manifolds.</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"> Yu-Sheng Lee (University of Michigan)</div><div class="event_title">CM congruences and anticyclotomic Euler systems <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />An Euler system is a collection of Galois cohomology classes satisfying certain norm relations, extensively used in studying the structure of Selmer groups since Kolyvagin\'s work on Heegner points on modular elliptic curves. On the other hand, Ribet\'s method and its generalizations show that when there are congruences between automorphic representations associated with Galois representations, one can often deform the Galois representation into an essentially irreducible family and obtain nontrivial Galois cohomology classes. In this talk, I will explain Urban\'s general framework for constructing Euler systems, which combines a systematic application of Ribet\'s method with input from p-adic local Langlands. I will then present a specific case involving the construction of anticyclotomic Euler systems associated with Hecke characters of CM fields and discuss their applications to Iwasawa theory.</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_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">Prof. Dr. Kelei Wang (School of Mathematics and Statistics Wuhan University)</div><div class="event_title">A Liouville theorem for supercritical Fujita equation <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’ll discuss a Liouville theorem for ancient solutions to supercritical Fujita equations, which says if the solution is close to the ODE solution at large scales, then it must be the ODE solution. Then I’ll discuss some application of this Liouville theorem to the analysis of first time singularity in this problem. This is based on a joint work with Juncheng Wei and Ke Wu.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat075.1">Zurich Graduate Colloquium</a></div><br /><div class="event_speaker">Salammbo Connolly (Université d\'Orsay)</div><div class="event_title">What is... the Morse fundamental group? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;div data-olk-copy-source="MessageBody">&nbsp;In this talk, I will start by explaining the basics of Morse theory, a powerful tool of study for smooth manifolds which simply uses a sufficiently generic smooth function on that manifold, which we call a Morse function. I will then explain how you can recover the fundamental group of the manifold from the Morse function, and if time permits, give some other properties of this "Morse fundamental group".&lt;/div> &lt;div>&nbsp;&lt;/div></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, October 29      </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">Gaurav Aggarwal (Universität Zürich)</div><div class="event_title">Cross-Sections and Their Applications to Number Theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>&lt;span style="color: #333333;">Cross-sections provide a powerful tool for translating problems about continuous flows into discrete dynamical systems. In this talk, I will introduce the basic theory of cross-sections, illustrating it with examples and applications. I will show how this framework can be used to establish a version of the L&eacute;vy&ndash;Khintchine theorem for almost every point with respect to a wide class of measures that are singular to Lebesgue measure&mdash;in particular, for almost every point in the middle-third Cantor set equipped with its natural self-similar measure. I will then discuss how the notion of cross-section extends to multi-parameter flows, the challenges that arise in this setting, and conclude with an application of this theory to a conjecture of Y. Cheung. <br><br>The talk is based on joint work with Anish Ghosh.&lt;/span>&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 II</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Yu Deng (Chicago University)</div><div class="event_title">The Hilbert sixth problem: particle and waves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A major component of the Hilbert sixth problem concerns the derivation of macroscopic equations of motion, and the associated kinetic equations, from microscopic first principles. In the classical setting of Boltzmann’s kinetic theory, this corresponds to the derivation of the Boltzmann equation from particle systems governed by Newtonian dynamics; in the theory of wave turbulence, this corresponds to the derivation of the wave kinetic equation from nonlinear dispersive equations. In this talk we present recent joint works with Zaher Hani and Xiao Ma, where we consider the hard sphere model in the particle setting, and the cubic nonlinear Schrödinger equation in the wave setting. In both cases we derive the corresponding kinetic equation up to arbitrarily long times, as long as the solution to this kinetic equation exists. This is a key step towards the resolution of the Hilbert sixth problem.Joris van Winden (TU Delft) Synchronization by noise for traveling pulses</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://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"> Alan Reid (Rice)</div><div class="event_title">Profinite rigidity, low-dimensional topology and Grothendieck Pairs <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The set of finite quotients of a finitely generated group is neatly captured by its profinite completion. A finitely generated (residually finite) group G is called profinitely rigid if whenever another finitely generated (residually finite) group H has isomorphic profinite completion, then H is isomorphic to G. This talk will discuss recent progress on groups that are (are not) profinitely rigid, and in particular describe a construction (Grothendieck Pairs) that produce a finitely presented group that is rigid amongst finitely presented groups, but not amongst finitely generated ones. An emphasis will be placed on the central role that 3-manifold groups play.</div><div class="event_time">15:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Joris von Winden (TU Delft)</div><div class="event_title">Synchronization by noise for traveling pulses <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We show synchronization by noise for stochastic partial differential equations which support traveling pulse solutions, such as the FitzHugh-Nagumo equation. We show that any two pulse-like solutions which start from different positions but are forced by the same realization of a multiplicative noise, converge to each other in probability on an appropriate time scale in the joint limit of small noise and long time. The noise is assumed to be Gaussian, white in time, colored and periodic in space, and non-degenerate only in the lowest Fourier mode. This is joint work with Christian Kuehn (TU Munich).</div><div class="event_time">16:00 &bull; EPF Lausanne, Bernoulli Center</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Gaultier Lambert (KTH Royal Institute of Technology)</div><div class="event_title"> Multiplicative chaos for the characteristic polynomial of the circular &#946;-ensemble <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The circular &#946;-ensemble (C&#946;E)  is a classical model in randommatrix theory which generalizes the eigenvalue process of Haar-distributed unitary random matrix. It can be interpreted as a system oftwo-dimensional point charges at equilibrium on the unit circle.The goal of this talk is to explain how to describe the asymptoticsproperties of the C&#946;E characteristic polynomial using the theory oforthogonal polynomials on the unit circle (OPUC). I will show thatrenormalized powers of the characteristic polynomial converge tomultiplicative chaos measures. If time permits, I will explain theconnection with the eigenvalue counting function, eigenvalue rigidityand previous results on the C&#946;E spectral measure and the Fyodorov-Bouchaud conjecture.This is joint work with Joseph Najnudel (University of Bristol).</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, October 30      </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">EP Lausanne</a></div><div class="event_type"><a class="external" href="https://memento.epfl.ch/MATHS/?period=14">Computational Mathematics Seminar </a></div><br /><div class="event_speaker"> Paul Bergold</div><div class="event_title">PDEs in Mixed Quantum-Classical Dynamics and the Koopmon Method <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />To alleviate the computational cost associated with fully quantum dynamics, a novel mixed quantum-classical (MQC) particle method – the Koopmon method – has recently been introduced [1]. Unlike conventional MQC models, which often suffer from inconsistencies such as violations of Heisenberg’s principle, this new approach resolves these issues by blending Koopman’s formulation of classical mechanics on Hilbert spaces with tools from symplectic geometry.The resulting continuum model, which can be regarded as a correction to the Ehrenfest PDE, retains both a variational and a Hamiltonian structure, while its nonlinear character calls for suitable closure schemes. Exploiting the underlying action principle, we introduce a regularization procedure that enables a singular-solution ansatz, thereby defining the trajectories of computational particles – the so-called Koopmons.Numerical experiments demonstrate the capability of the Koopmon method to reproduce nonadiabatic quantum-classical transitions and to capture Rashba-type spin dynamics in quantum nanowire systems. We conclude by proposing a novel strategy for a hybrid Ehrenfest–Koopman implementation that integrates the advantages of both approaches.[1] Bauer, W.; Bergold, P.; Gay-Balmaz, F., and Tronci, C. Koopmon trajectories in nonadiabatic quantum-classical dynamics. SIAM Multiscale Model. Simul., 22(4):1365-1401 (2024)[2] Gay-Balmaz, F.; Tronci, C. Evolution of hybrid quantum-classical wavefunctions. Phys. D 440, 133450 (2022)[3] Gay-Balmaz, F.; Tronci, C. Koopman wavefunctions and classical states in hybrid quantum-classical dynamics. J. Geom. Mech. 14, n. 4, 559-596 (2022)</div><div class="event_time">10:15 &bull; EP Lausanne, BCH 3118</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"> Bo\'az Klartag (The Weizmann Institute of Science)</div><div class="event_title">CANCELLED: 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://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Dr. Stefano Rossi (ETH Zürich)</div><div class="event_title">Quasineutral limit for the relativistic Vlasov--Maxwell system <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>I will present a recent result concerning the quasineutral limit for the relativistic Vlasov--Maxwell system, a fundamental model in plasma physics. The quasineutral limit describes the regime in which the Debye length &mdash; the characteristic scale of charge separation &mdash; becomes negligible compared to the macroscopic scale of the plasma, so that the plasma behaves as if it were electrically neutral. While this singular limit has been extensively studied in the electrostatic case (i.e., the Vlasov--Poisson system), the full electromagnetic setting introduces new difficulties due to the coupling with Maxwell&rsquo;s equations and the presence of a magnetic field, which give rise to additional oscillatory phenomena. I will explain how, in this context, one can rigorously establish strong convergence to a limiting electron magnetohydrodynamics (e-MHD) system, and clarify the precise sense in which this limit holds. This is based on a joint work with A. Gagnebin, M. Iacobelli, and A. Rege.&lt;/p></div><div class="event_time">16:00 &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/annonces/seminaire-danalyse-numerique">Séminaire d\'Analyse Numérique </a></div><br /><div class="event_speaker"> Walter Gander</div><div class="event_title">The first algorithms to compute the SVD <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The singular values of a matrix A can be computed as the square roots of the eigenvalues of the matrix A^T A. However, the calculation of A^T A in finite arithmetic seriously violates the smaller singular values. Therefore the pioneers Gene Golub, William Kahan and Christian Reinsch constructed new algorithms which compute the singular values directly from A without forming A^T A. We describe the first algorithm proposed by Golub/Kahan 1965. Then we discuss the two algorithms by Golub-Businger 1967 and by Reinsch 1967 which were developed independently at the same time. The current algorithm used in all software packages is the one of Reinsch. We explain why the algorithm of Reinsch appeared in ``Handbook of Automatic Computation\'\' under joint authorship with G.H. Golub</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Razvan-Octavian Radu (Princeton University)</div><div class="event_title">Desingularization of V-states <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>V-states are uniformly rotating vortex patch solutions to the 2D Euler equations. Namely, the vorticity is given by the characteristic function of a domain which rotates around the origin with constant angular velocity. Examples of V-states include Kirchhoff ellipses and m-fold symmetric patches which bifurcate from the disk. I will describe how, for any V-state satisfying a certain non-degeneracy condition, there exist smooth rigidly rotating solutions to the 2D Euler equations approximating it arbitrarily well in the natural H&ouml;lder spaces. I will then argue that all but countably many Kirchhoff ellipses, as well as all m-fold symmetric V-states near the disk satisfy this non-degeneracy.&lt;/p></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://math.ethz.ch/s/talks-in-financial-and-insurance-mathematics">Talks in Financial and Insurance Mathematics</a></div><br /><div class="event_speaker"> Andi Bodnariu (Stockholm University)</div><div class="event_title">Time inconsistent control and stopping problems, blowing up intensities and rates <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The goal of this talk is to present recent results in the field of time-inconsistent stopping and control problems driven by stochastic differential equations. The talk considers the weak equilibrium approach. While solving these problems interesting novel type of strategies appear that are not present in the time consistent version. In particular for time-inconsistent stopping problems, a class of mixed (i.e., randomized) stopping times based on a local time construction of the stopping intensity appears. The counterpart for singular time-inconsistent control problems is given by a control which results in an absolutely continuous rate that creates an inaccessible boundary. Additionally, can be shown that the classical solution approach to these problems used in the time-consistent version  (pure stopping times with no mixing and reflection for the SSC) does not always result in an equilibrium making these type of novel strategies necessary. This creates further insight into the strategy space that should be considered in order to prove general existence of equilibria, which is an open problem for most time-inconsistent problems.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, October 31      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/anmath/seminars/">Seminar of Analysis </a></div><br /><div class="event_speaker"> Matei Coiculescu (University of Princeton)</div><div class="event_title">Title T.B.A.</div><div class="event_time">14:15 &bull; EPF Lausanne</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">Dr. Peter Jossen (King\'s College London)</div><div class="event_title">Exponential integrals and period numbers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Definite integrals where the integrand contains an exponential functionare a common sight in mathematics and mathematical physics. Inparticular cases, the values of these integrals turn out to beexpressible as definite integrals with an algebraic integrand, thatmeans, they are classical periods. A very well known example for thisis the identity$$\\int_0^\\infty t^{-1} \\sin(t) dt = \\pi/2 = \\int_{-1}^1 \\sqrt{1-t^2}dt.$$Another example is given by moment integrals of Bessel functions, whichturn out to be multiples of pi by an algebraic number in the simplestcases. In more elaborate cases however, the formulas for Bessel momentsstart to involve special values of L-functions, elliptic integrals andvalues of hypergeometric functions, all of which are classical periodsassociated with algebraic varieties defined over number fields.I will explain why it is no accident that Bessel moments, and indeedmany other similar definite integrals produce period numbers, and whichalgebraic varieties they come from.</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/schools/sb/research/math/statistics-seminars/">Statistics Seminar </a></div><br /><div class="event_speaker"> Victor-Emmanuel Brunel (ENSAE / CREST)</div><div class="event_title">Deep points in curved spaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this talk, based on a joint work with Shin-ichi Ohta (Osaka University) and Jordan Serres (Université Sorbonne, Paris), I will present a generalization of Grunbaum’s inequality to curved spaces. This inequality states that in Euclidean spaces, uniform distributions on convex bodies and, more generally, log-concave distributions, have deep points in Tukey’s sense: There always exists a point such that any half-space containing that point has mass bounded from below by some universal positive constant, independently of the dimension of the space. This fact is important in high dimensional statistics because it allows to discriminate deep points from shallow points even in high dimensions. It also has applications in convex optimization, e.g., to prove the algorithmic performance of cutting plane methods in high dimensions. We extend this inequality to non-Euclidean spaces that satisfy a curvature-dimension condition, where splitting theorems allow to extend the definition of half-spaces and reduce the analysis to one-dimensional computations.  </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. Weite Pi (MPI Bonn)</div><div class="event_title">Perverse = Chern and &#967;-independence phenomena for moduli of 1-dimensional sheaves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The goal of this talk is to discuss the geometry and intersection theory of Le Potier’s moduli space of 1-dimensional sheaves on the projective plane. We focus on two aspects: first, the "P=C" conjecture relating two filtrations of highly different nature on cohomology, which can be viewed as a del Pezzo analog of the celebrated P=W conjecture; second, the so-called &#967;-independence phenomenon, which stems from enumerative geometry and predicts surprising consequences on the cohomology of the moduli space. After surveying known results, I will explain how these two aspects are linked via an “associated graded” &#967;-independence conjecture (work in progress). This talk is primarily based on joint work with Yakov Kononov, Woonam Lim, and Miguel Moreira.</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>';