var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-11"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-9"><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. 12</span>      <span style="float: right; text-align:right; width: 250px;">6.5 - 10.5.2024</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Spring Semester 2024</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, May 6      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/cmgr/cmgr/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Peter Feller (ETHZ)</div><div class="event_title">Effective hyperbolization of 3-manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />After a brief survey of the study of low-dimensional manifolds -- spaces locally modelled on the topological space R^n for n&lt;5 -- we will discuss the idea of geometrization. The latter refers to a program, initiated by Thurston, of studying 3-dimensional manifolds by means of eight geometric model spaces, which include the Euclidean space and hyperbolic space. It turns out that most 3-dimensional manifolds carry a hyperbolic structure, i.e. they are locally modelled on hyperbolic space. A precise version of this statement was proven by Maher invoking topological work of Hempel and Perelman\'s celebrated analysis results on Ricci-flow. We will discuss an approach to hyperbolization of most 3-dimensional manifolds that circumvents invoking the Ricci flow. As an upshot, with this approach one can control many geometric quantities such as injectivity radius, diameter, and volume of hyperbolic structures. We will provide ``hands-on\'\' examples of 3-manifolds that can be hyperbolized with this scheme. Based on joint work in progress with A. Sisto and G. Viaggi</div><div class="event_time">11:00 &bull; EPF Lausanne, Room CM-1-517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Daniel Dadush</div><div class="event_title">A strongly polynomial algorithm for linear programs with at most two non-zero entries per row or column <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We give a strongly polynomial algorithm for minimum cost generalized flow, and hence for optimizing any linear program with at most two non-zero entries per row, or at most two non-zero entries per column. Primal and dual feasibility were shown by Megiddo (SICOMP ’83) and Végh (MOR ’17) respectively. Our result can be viewed as progress towards understanding whether all linear programs can be solved in strongly polynomial time, also referred to as Smale’s 9th problem. Our approach is based on the recent primal-dual interior point method (IPM) due to Allamigeon, Dadush, Loho, Natura and Végh (FOCS ’22). The number of iterations needed by the IPM is bounded, up to a polynomial factor in the number of inequalities, by the straight line complexity of the central path. Roughly speaking, this is the minimum number of pieces of any piecewise linear curve that multiplicatively approximates the central path. As our main contribution, we show that the straight line complexity of any minimum cost generalized flow instance is polynomial in the number of arcs and vertices. By applying a reduction of Hochbaum (ORL ’04), the same bound applies to any linear program with at most two non-zeros per column or per row. To be able to run the IPM, one requires a suitable initial point. For this purpose, we develop a novel multistage approach, where each stage can be solved in strongly polynomial time given the result of the previous stage. Beyond this, substantial work is needed to ensure that the bit complexity of each iterate remains bounded during the execution of the algorithm. For this purpose, we show that one can maintain a representation of the iterates as a low complexity convex combination of vertices. Our approach is black-box and can be applied to any log-barrier path following method.</div><div class="event_time">11:00 &bull; EPF Lausanne</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/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Luca Ferrigno (Roma Tre University)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-luca-ferrigno-roma-tre-university/">An introduction to Unlikely Intersections</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />abstract</div><div class="event_time">12:15 &bull; Universität Basel, Spiegelgasse 5, Seminar Room 05.002</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"> Karoly Boroczky (Rényi Institute of Mathematics, Budapest)</div><div class="event_title">Sphere packings in dimensions 8 and 24 at the crossroad of geometry, number theory and Fourier analysis <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The problem of dense packings of equal spheres in Rn - a problem arising in number theory and geometry - goes back to Kepler, Lagrange and Gauss, still the optimal density is only known in dimensions n=2,3,8,24. Our main focus is the cases n=8,24 where the E8 lattice and the Leech lattice are optimal. We sketch history, and how a little lemma in Fourier analysis set up the scene to Maryna Viazovska\'s groundbreaking results using modular forms. At the end, the structure of the close to optimal packings is described in dimensions 8 and 24, a joint result with Joao Ramos and Danylo Radchenko.</div><div class="event_time">17:15 &bull; Universität Bern, Sidlerstrasse 5, 3012 Bern, Lecture Room B6</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, May 7      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Umut Çetin (London School of Economics)</div><div class="event_title">Mathematics of Market Microstructure</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_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"> Olga Kharlampovich (CUNY, Graduate Center and Hunter College)</div><div class="event_title">Quantification of separability of cubically convex-cocompact subgroups of RAAGs via representations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We answer the question asked by Louder, McReinolds and Patel  and prove the following statement. Let L be a RAAG, H a cubically convex-cocompact subgroup of L, then there is a finite dimensional representation of L that separates the subgroup H in the induced Zariski topology. As a corollary, we establish a polynomial upper bound on the size of the quotients used to separate H in L. This implies the same statement for a virtually special group L and, in particular, a fundamental group of a hyperbolic 3-manifold.For any finitely generated subgroup H of a limit group L we prove the same results and, in addition, show that  there exists a finite-index subgroup K containing H, such that K is a subgroup of a group obtained from H  by a series of extensions of centralizers and free products with infinite cyclic group. If H is non-abelian, the K  is fully residually H.  A corollary is that a hyperbolic limit group satisfies the Geometric Hanna Neumann conjecture. These are  joint results with K. Brown and A. Vdovina.</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_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"> Thomas Rothvoss (University of Washington)</div><div class="event_title">Optimal Online Discrepancy Minimization <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We prove that there exists an online algorithm that for any sequence of vectors $v_1,\\ldots,v_T \\in \\setR^n$with $\\|v_i\\|_2 \\leq 1$, arriving one at a time, decides random signs $x_1,\\ldots,x_T \\in \\{ -1,1\\}$ so thatfor every $t \\le T$, the prefix sum $\\sum_{i=1}^t x_i v_i$ is $O(1)$-subgaussian. This improves over the work ofAlweiss, Liu and Sawhney who kept prefix sums $O(\\sqrt{\\log (nT)})$-subgaussian.Our proof combines a generalization of Banaszczyk\'s prefix balancing result to trees with a cloning argument to finddistributions rather than single colorings.This is joint work with Janardhan Kulkarni and Victor Reis.</div><div class="event_time">11:00 &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/annonces/seminaire-danalyse-numerique">Séminaire d\'Analyse Numérique </a></div><br /><div class="event_speaker"> Ernst Hairer (Université de Genève)</div><div class="event_title">Long-time behaviour of numerical integrators for charged particle dynamics <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Boris algorithm is the most popular time integrator for charged particle motion inelectric and magnetic force fields. It is a symmetric one-step method, and it preservesthe phase volume exactly. However, it is not symplectic.In this talk we prove near-conservation of energy over very long times in the specialcases where either the magnetic field is constant or the electric potential is quadratic.When none of these assumptions is satisfied, it is illustrated by numerical examplesthat the numerical energy can have a linear drift or its error can behave like a random walk.We thank Martin Gander for drawing our attention to this problem.The presented results have been obtained in collaboration with Christian Lubich.</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_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker">Dr. Mateus Sousa (BCAM)</div><div class="event_title">Local and global extremizers for Fourier restriction estimates <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 will see a brief history of sharp Fourier restriction theory and some recent developments related to Fourier restriction estimates on spheres. We will discuss the problem of finding sharp constants for such inequalities, as well as the questions of existence and classification of extremizers of these estimates.</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://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://stat.ethz.ch/events/research_seminar">Research Seminar in Statistics</a></div><br /><div class="event_speaker"> Zijian Guo (Rutgers University)</div><div class="event_title">Adversarially Robust Learning: Identification, Estimation, and Uncertainty Quantification <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Empirical risk minimization may lead to poor prediction performance when the target distribution differs from the source populations. This talk discusses leveraging data from multiple sources and constructing more generalizable and transportable prediction models. We introduce an adversarially robust prediction model to optimize a worst-case reward concerning a class of target distributions and show that our introduced model is a weighted average of the source populations\' conditional outcome models. We leverage this identification result to robustify arbitrary machine learning algorithms, including, for example, high-dimensional regression, random forests, and neural networks. In our adversarial learning framework, we propose a novel sampling method to quantify the uncertainty of the adversarial robust prediction model. Moreover, we introduce guided adversarially robust transfer learning (GART) that uses a small amount of target domain data to guide adversarial learning. We show that GART achieves a faster convergence rate than the model fitted with the target data. Our comprehensive simulation studies suggest that GART can substantially outperform existing transfer learning methods, attaining higher robustness and accuracy.Short Bio: Zijian Guo is an associate professor at the Department of Statistics at Rutgers University. He obtained a Ph.D. in Statistics in 2017 from Wharton School, University of Pennsylvania. His research interests include causal inference, multi-source and transfer learning, high-dimensional statistics, and nonstandard statistical inference. </div><div class="event_time">15:15 &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://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">Diane Saint Aubin (Universität Zürich)</div><div class="event_title">What is... Bose-Einstein condensation? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />\'\'A Bose-Einstein condensate (BEC) is a state of matter that is formed when a low-density gas of bosons is cooled to near absolute zero. Under these conditions, a majority of the particles occupy the same quantum state and quantum effects become apparent. First predicted by Bose and Einstein a century ago, BECs were realised in laboratories over eight decades later and led to the Nobel price in 2001. Since then, many progresses have been made in the rigorous study and understanding of quantum many-body systems from a mathematical point of view. In this talk we will give an introduction to quantum mechanics and to the mathematical description of quantum many-body systems. We will then present a formal definition of BEC.</div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_fr"><a class="external" href="https://www.unifr.ch">Université de Fribourg</a></div><div class="event_type"><a class="external" href="https://www.unifr.ch/math/de/info/kolloquium.html">Colloquium </a></div><br /><div class="event_speaker">Prof. Dr. Gianluca Crippa (Uni Basel)</div><div class="event_title">Anomalous dissipation in fluid dynamics <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The celebrated Kolmogorov\'s K41 theory of fully developed turbulenceattempts to explain and quantify "wild, but typical" behaviors of"chaotic" fluids, most notably the lack of conservation of the totalenergy. The loss of energy is not due to friction between fluidmolecules, but rather to the limited regularity of the flow.Kolmogorov\'s theory is numerically and experimentally validated to avery large extent, however, very little is known in rigorousmathematical terms. In my lecture, I will present some aspects ofKolmogorov\'s theory, and illustrate recent results (in collaborationwith M. Colombo and M. Sorella) on a related question for the linearadvection equation.</div><div class="event_time">17:15 &bull; Université de Fribourg, room Phys 2.52</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/la-une/maths-partag-2024">Maths à PartaG</a></div><br /><div class="event_speaker"> Francis Brown (UNIGE & University of Oxford)</div><div class="event_title">Nombres mistérieux - des mathématiques à la physique, et invérsement <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Les nombres ont toujours fasciné l’humanité par leur nature mystérieuse et leur omniprésence dans notre quotidien. Certains sont tangibles, comme les nombres entiers, d’autres, comme &#960; ou &#8730;2 sont plus insaisissables même si on peut facilement les représenter physiquement. D’autres encore continuent d’intriguer chercheurs et chercheuses en mathématiques et sont au cœur de la recherche actuelle. De leur découverte par le mathématicien et physicien suisse Leonhard Euler au 18ème siècle jusqu’à leur réapparition mystérieuse au cœur de la physique des particules au 20ème siècle, cet exposé vous plongera dans l’univers des valeurs zêta, nombres intrigants apparaissant dans différents domaines en apparence très éloignés.Cet exposé sera suivi d’une discussion avec Francesco Riva, professeur de physique à l’Université de Genève et créateur du jeu Tutti Quantum, durant laquelle le public sera invité à poser ses questions.</div><div class="event_time">18:00 &bull; Université de Genève, Uni Dufour, U300</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, May 8      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_fr"><a class="external" href="https://www.unifr.ch">Université de Fribourg</a></div><div class="event_type"><a class="external" href="https://commonweb.unifr.ch/_Science/Math/Pub/Math/seminars/OSgeom-top.html">Oberseminar Geometrie</a></div><br /><div class="event_speaker"> Jun Nonaka (Waseda)</div><div class="event_title">The growth rates of ideal Coxeter polyhedra in hyperbolic 3-space <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In 2011, Kellerhals and Perren conjectured that the growth rates of thereflection groups given by compact hyperbolic Coxeter polyhedra arealways Perron numbers. We prove that this conjecture holds in thecontext of ideal Coxeter polyhedra in hyperbolic 3-space and discussfurther implications if time permits.</div><div class="event_time">10:20 &bull; Université de Fribourg, room Phys 2.52</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"> Damien Scieur</div><div class="event_title">Adaptive Quasi-Newton and Anderson Acceleration with Global Convergence Rates <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Despite the impressive numerical performance of the quasi-Newton and Anderson/nonlinear acceleration methods, their global convergence rates have remained elusive for over 50 years. This study addresses this long-standing issue by introducing a framework that derives novel, adaptive quasi-Newton and nonlinear/Anderson acceleration schemes. Under mild assumptions, the proposed iterative methods exhibit explicit, non-asymptotic convergence rates that blend those of the gradient descent and Cubic Regularized Newton\'s methods. The proposed approach also includes an accelerated version for convex functions. Notably, these rates are achieved adaptively without prior knowledge of the function\'s parameters. The framework presented in this study is generic, and its special cases include algorithms such as Newton\'s method with random subspaces, finite differences, or lazy Hessian. Numerical experiments demonstrated the efficiency of the proposed framework, even compared to the l-BFGS algorithm with Wolfe line-search.</div><div class="event_time">11:15 &bull; EPF Lausanne, CM 1517</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/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Prof. Dr. Weikun He (Chinese Academy of Sciences)</div><div class="event_title">Quantitative equidistribution of random walks on SL_2(R)/SL_2(Z) <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We consider random walks on the homogeneous space SL_2(R)/SL_2(Z) induced by the action of a Zariski-dense subgroup consisting of matrices with algebraic entries. I will present a recent joint work with Timothée Bénard where we showed the following. The random walk equidistributes in law unless it is trapped in a finite orbit. Moreover, the convergence is fast unless the starting point is close to a finite orbit or high in the cusp.</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.1</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://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"> Tommaso Scognamiglio</div><div class="event_title">Character stacks and varieties for Riemann surfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Given a punctured Riemann surface X, character stacks and varieties are geometric objects which parametrize  local systems on X with prescribed local monodromies. The cohomology of character stacks and varieties is almost completely understood in the case of a generic choice of monodromies, thanks to the work of Hausel, Letellier and Rodriguez-Villegas and Mellit. Much less is known about the non-generic case. In the first part of the talk, I will introduce and define character stacks and varieties and review the known results about the cohomology of these objects. In the second part, I will focus on the non-generic case and give a sketch of the proof of a formula for the E-series of non-generic character stacks, which is the main result of my PhD thesis. </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/analysis/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker"> Christoph Kehle (ETH Zürich)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-analysis-and-mathematical-physics-christoph-kehle-eth-zuerich/">The third law of black hole thermodynamics and the black hole formation threshold</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Extremal black holes are special types of black holes which have exactly zero temperature. I will present a proof that extremal black holes form in finite time in gravitational collapse of charged matter. In particular, this construction provides a definitive disproof of the "third law" of black hole thermodynamics. I will also present a recent result which shows that extremal black holes arise on the black hole formation threshold in the moduli space of gravitational collapse. This gives rise to a new conjectural picture of "extremal critical collapse." This is joint work with Ryan Unger (Princeton).</div><div class="event_time">14:15 &bull; Universität Basel, Spiegelgasse 5, Seminarraum 05.002</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/sam/news-and-events/zhacm-colloquia">Zurich Colloquium in Applied and Computational Mathematics</a></div><br /><div class="event_speaker"><a class="external" href="https://maartendehoop.rice.edu/">Prof. Dr. Maarten de Hoop (Rice University)</a></div><div class="event_title">Geometric and spectral inverse problems for terrestrial planets and gas giants <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We present results pertaining to selected inverse problems associated with seismology on Earth, Mars and Saturn. We focus on geometrical or travel time data originating from the propagation of singularities and the spectra corresponding with normal modes. For terrestrial or rocky planets we highlight recent insights with generic anisotropic elasticity, and for gas giants we reveal the accommodation of the equations of state all the way up to their boundaries. We briefly touch upon whether information on uniqueness of inverse problems is encoded in the data.</div><div class="event_time">16:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room E 1.2</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/news-and-events/events/lecture-series/inaugural-and-farewell-lectures.html">Inaugural Lectures</a></div><br /><div class="event_speaker">PD Dr. Menny Akka</div><div class="event_title">Homogeneous spaces: a playground for arithmetic, dynamics, groups and geometry</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>    </div>    <div class="day">      <div class="day_title">        Thursday, May 9      </div>      <div class="day_content">        <div class="day_content_item no_event">        No events scheduled today!        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, May 10      </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"> Emil Wiedermann (FAU Erlangen-Nürnberg)</div><div class="event_title">Strong Convergence of Vorticity in the 2D Incompressible Viscosity Limit <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />If the initial vorticity of a two-dimensional incompressible flow is in $L^p$, then it is classically known that solutions of the Navier-Stokes equations converge to a solution of Euler in the zero viscosity limit. Here, the convergence of the corresponding vorticities is only weak. We will present some recent results on how to upgrade to strong convergence of vorticity. The problem is particularly interesting in a bounded domain.</div><div class="event_time">14:15 &bull; EPF Lausanne, MA B1 11</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>';