var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-3"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-1"><img src="//www2.math.ethz.ch/smsjs/images/arrow_right.png"/></a></div>    <div class="sms_title">      <span style="float: left;">SMS</span>      <span>SWISS MATHEMATICAL SOCIETY</span>      <span style="float: right;">SMG</span>    </div>    <div class="sms_info">      <span style="float: left; width: 250px;">Bulletin no. 7</span>      <span style="float: right; text-align:right; width: 250px;">31.3 - 4.4.2025</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Spring Semester 2025</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, March 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/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Séminaire de Topologie </a></div><br /><div class="event_speaker"> Nima Razekh (University of Greifswald)</div><div class="event_title"><a class="external" href="https://www.epfl.ch/labs/hessbellwald-lab/3141-2/">From Internal &#8734;-Categories to the Foundation of Mathematics</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Internal categories extend the concept of ordinary categories, enabling the application of categorical methods across diverse contexts, from Lie groupoids to condensed categories. A particularly elegant use of internal category theory arises in higher categorical sheaf theory, having resulted in powerful &#8734;-categorical techniques and results internal to Grothendieck &#8734;-topoi. In this talk, we seek to generalize several results to more general internal &#8734;-categories, only to encounter unexpected challenges that surprisingly intertwine &#8734;-category theory with the foundations of mathematics.</div><div class="event_time">13:45 &bull; <a class="external" href="http://search.epfl.ch/psearch.action?q=MA%20B1%20524">EPF Lausanne</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/symplectic-geometry-seminar">Symplectic Geometry Seminar</a></div><br /><div class="event_speaker"> Umut Varolgunes (Koç University)</div><div class="event_title">Contact big fiber theorems <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Entov-Polterovich\'s celebrated symplectic big fiber theorem says that any smooth map from a closed symplectic manifold to an Euclidean space with Poisson commuting components has at least one Hamiltonian non-displaceable fiber. I will discuss contact analogues of this theorem that we proved with Yuhan Sun and Igor Uljarevic using symplectic cohomology with support. Unlike the symplectic case, the validity of the statements require conditions on the closed contact manifold. One such condition is to admit a Liouville filling with non-zero symplectic cohomology. In the case of Boothby-Wang (pre-quantization) contact manifolds, we prove the result under the condition that the Euler class of the circle bundle is not an invertible element in the quantum cohomology of the base symplectic manifold. I will also explain how to obtain Givental\'s Legendrian rigidity result in the standard contact real projective spaces as an application.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Thomas Budzinski (ENS Lyon)</div><div class="event_title">The longest increasing subsequence of random separable permutations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Consider a binary tree $T$ (i.e. with vertex degrees $1$ or $3$) decorated with positive or negative signs on its internal nodes. We are interested in the size of the largest subtree of $T$ where no negative node has degree 3. When $T$ is uniform among binary trees with size $n$ and the signs are i.i.d. Bernoulli with parameter $p$, this also describes the length of the longest increasing subsequence in natural models of random separable permutations. We will see that this quantity behaves like $n^{\\alpha(p)+o(1)}$, where $\\alpha(p)$ solves the following nice equation:\\[ \\frac{2^{1/\\alpha}\\sqrt{\\pi}\\,\\Gamma(1-1/(2\\alpha))}{\\Gamma(1/2-1/(2\\alpha))}=\\frac{p-1}{p}. \\]Based on ongoing work with Arka Adhikari, Jacopo Borga, William da Silva and Delphin Sénizergues</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. Adam Prenosil (University of Barcelona)</div><div class="event_title"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Bridges between syntax and semantics in algebraic logic</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In addition to the familiar two-valued classical logic, which underpins most of mathematics, a great number of non-classical logics have been introduced and studied over the last century, with various motivations and varying degrees of success. Prominent examples include intuitionistic logic (which formalizes constructive reasoning), fuzzy logics such as &#321;ukasiewicz and Gödel logic (which formalize reasoning with imprecise notions), and paraconsistent logics such as Belnap–Dunn logic (which formalizes reasoning with conflicting information). Such logics can be viewed from two perspectives: a syntactic one, which deals with formulas and their derivability, and a semantic one, which furnishes the formulas of a given logic with interpretations in some class of mathematical structures. In the field of algebraic logic, we take these structures to be algebras, which enables us to study non-classical logics using the methods of universal algebra. A central topic in algebraic logic is then building bridges which connect prominent syntactic properties of a logic to semantic properties of an associated class of algebras, the so-called algebraic counterpart of a logic. We review some of the classical results of this type and then zoom in on a more recent one, which connects the validity of the Law of the Excluded Middle in a logic (a syntactic property) with the semisimplicity of its algebraic counterpart (a semantic property).</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, April 1      </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"> Laurent Vuillon (Université de Savoie Mont Blanc)</div><div class="event_title">Combinatorics on words for Markoff numbers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In a first part, we introduce the Markoff numberswhich are fascinating integers related to number theory, Diophantine equation, hyperbolic geometry, continued fractions and Christoffel words. Many great mathematicians have worked on these numbers and the 100 years uniqueness conjecture by Frobenius is still unsolved. We state a new formula to compute the Markoff numbers using iterated palindromic closure and the Thue-Morse substitution. The main theorem shows that for each Markoff number m, there exists a word v &#8712; {a, b} &#8727; such that m &#8722; 2 is equal to the length of the iterated palindromic closure of the iterated antipalindromic closure of the word av. This work gives a recursive construction of Markoff numbers by the lengths of words generated by a discrete dynamical system.In a second part, we show new results on Markoff numbers by using generalizations of Farey’s fractions and Christoffel words. In particular, we study a valuation of paths on the N^2 grid related to Markoff numbers. We show two conjectures of the famous book of Aigner by preserving themonotonicity of this valuation on a sequence of paths and byinvestigating the dynamic of local path transformations.C. Lagisquet, E. Pelantová, S. Tavenas, L. Vuillon On the Markov numbers: fixed numerator, denominator, and sum conjectures Advances in Applied Mathematics 130, 102227 6 2021C. Reutenauer and L. Vuillon, Palindromic Closures and Thue-Morse Substitution for Markoff Numbers, Uniform Distribution Theory 12 (2017), no. 2, 25-35.</div><div class="event_time">10:30 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat770.1">Oberseminar: Algebraische Geometrie</a></div><br /><div class="event_speaker">Dr. Dmitriy Rumynin (University of Warwick)</div><div class="event_title">Symmetric spaces, where Topology meets Representation Theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We will use Representation Theory to calculate systematically and efficiently the topological invariants of compact Lie groups and homogeneous spaces. Most of the talk is covered by our second paper on ArXiv with John Jones and Adam Thomas, who are both at Warwick. The paper is a part of the ongoing project to study the topological invariants of the four exceptional Rosenfeld projective planes.</div><div class="event_time">13:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 25</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"> Ludovic Metivier (University of Grenoble)</div><div class="event_title">Controllability method for solving the frequency-domain elastodynamic equations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Computing numerical solution of frequency-domain wave equations is a challenging problem. The corresponding linear system isill-conditioned, and preconditioners remaining efficient for large scale 3D problems, where one tries to model the wave propagation over severalhundreds of wavelengths in each direction, are difficult to design. For practical applications, such as in seismic imaging, the common practice has thus been to work with parallel direct solvers dedicated to the solution of sparse linear systems. This approach is all the more interesting when multiple right-hand-sides have to be considered, as it is the case in seismic imaging. Recently, these approaches have been coupled to iterative approaches through domain decomposition strategies,yielding interesting perspectives in terms of 3D large scaleapplications . In this work, we are interested yet in another approach,named controllability approach, introduced by Bristeau et al in 1998 for acouctic problems. The innovation relies on considering the problem of finding a harmonic solution of the wave equations as finding a time-domain solution satisfying a periodicitiy criterion: the solutionafter one period needs to be as close as possible to the solution at time 0. In this controllability problem, the control parameters are the initial conditions on the solution, and one can express thetime-harmonic solution as a linear combination of the "optimal" initial conditions. In this work, we implement this strategy for the 3D elastodynamics equations, relying on an existing time-domain code for these equations named SEM46, which implements a spectral element discretization and is highly optimized to run large scale computational machines. We show how the controllability approach can be adapted to the 3D elastodynamics equations and how we can benefit from SEM46 to construct time-harmonic solutions for 3D large scale realistic problems.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.unil.ch/dsa/en/home/menuinst/seminaires--evenements/research-seminars.html">Talks in Actuarial Mathematics </a></div><br /><div class="event_speaker"> Gilles Stupfler (University of Angers)</div><div class="event_title">Some new perspectives on extremal regression <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The objective of extremal regression is to estimate and infer quantities describing the tail of a conditional distribution. Examples of such quantities include quantiles and expectiles, and the regression version of the Expected Shortfall. Traditional regression estimators at the tails typically suffer from instability and inconsistency due to data sparseness, especially when the underlying conditional distributions are heavy-tailed. Existing approaches to extremal regression in the heavy-tailed case fall into two main categories: linear quantile regression approaches and, at the opposite, nonparametric approaches. They are also typically restricted to i.i.d. data-generating processes. I will here give an overview of a recent series of papers that discuss extremal regression methods in location-scale regression models (containing linear regression quantile models) and nonparametric regression models. Some key novel results include a general toolbox for extreme value estimation in the presence of random errors and joint asymptotic normality results for nonparametric extreme conditional quantile estimators constructed upon strongly mixing data. Joint work with Y. Abbas, A. Daouia, S. Girard, M. Oesting and A. Usseglio-Carleve.</div><div class="event_time">14:00 &bull; EPF Lausanne, Extranef 125</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://memento.epfl.ch/event/probability-and-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Andres  Contreras Hip  (University of Chicago)</div><div class="event_title">Gaussian fluctuations for the open one-dimensional KPZ 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 we consider the open one-dimensional KPZ equation on the interval $[0,L]$ with Neumann boundary conditions. For $L \\sim t^{\\alpha}$ and stationary initial conditions,  we obtain matching upper and lower bounds on the variance of the height function for $\\alpha \\in [0,\\frac23]$ for different choices of the boundary parameters. Additionally, for fixed $L$ and an arbitrary probability measure as initial conditions, we show Gaussian fluctuations for the height function as $t\\to \\infty$. Joint work with Sayan Das and Antonios Zitridis.</div><div class="event_time">14:00 &bull; EPF Lausanne, MA B1 524</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_nolink">Number Theory Seminar</a></div><br /><div class="event_speaker"> Eduardo  Rocha Walchek  (Montevideo)</div><div class="event_title">Big Generalized Heegner Cycles in the Quaternionic Setting <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We discuss the $p$-adic interpolation of generalized Heegner cycles of Bertolini–Darmon–Prasanna attached to eigenforms of level $N$ away from $p$ along a quaternionic $p$-adic Coleman family of modular forms. The elliptic case, where one works over a quadratic imaginary field $K$ in which all prime factors of $N$ are split, has been independently studied by Büyükboduk–Lei and Jetchev–Loeffler–Zerbes. We follow the latter in our approach to the quaternionic setting, where $N$ is now allowed to have inert primes in $K$. The correspondently constructed big generalized Heegner classes enjoy Euler system properties and are found to be related to special values of the BDP $p$-adic $L$-function lying outside its range of interpolation, through an explicit reciprocity law.</div><div class="event_time">15:00 &bull; <a class="external" href="fernuni.zoom.us/my/davidloeffler">UniDistance Suisse, online</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">Dr. Anna  Skorobogatova (ETH Zurich, ITS)</div><div class="event_title">Regularity for semilinear variational problems with a topological constraint <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss the regularity of solutions to a class of semilinear free boundary problems in which admissible functions have a topological constraint, or spanning condition, on their 1-level set. This constraint forces the 1-level set, which is a free boundary, to behave like a surface with singularities, attached to a fixed boundary frame, in the spirit of the set-theoretic Plateau problem. Two such free boundary problems that have been well-studied are the minimization of capacity among surfaces sharing a common boundary and an Allen-Cahn approximation of the set-theoretic Plateau problem. We establish optimal Lipschitz regularity for solutions, and analytic regularity for the free boundaries away from a codimension two singular set. We further characterize the singularity models for these problems as conical critical points of the minimal capacity problem, which are closely related to spectral optimal partition and segregation problems. This is joint work with Mike Novack and Daniel Restrepo.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Young-Hoon  Kiem   (Korea Institute for Advanced Study )</div><div class="event_title">Birational geometry of generalized Hessenberg varieties and the Shareshian-Wachs conjecture <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Regular semisimple Hessenberg varieties have interesting birational morphisms among them which we can exploit to compute the Tymoczko representations on their cohomology. As a consequence, we obtain elementary proofs of the modular law and the Shareshian-Wach conjecture which relates the Frobenius characteristics with the chromatic quasi-symmetric functions of associated graphs. A similar story can be told for the twin manifolds of Hessenberg varieties where the Frobenius characteristics give us certain LLT polynomials. In this talk, I will discuss these birational geometric aspects of Hessenberg varieties and some applications. Based on a joint work with Donggun Lee.  </div><div class="event_time">15:15 &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://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">Tobias Bisang (Universität Basel)</div><div class="event_title">What is... the Manin-Mumford conjecture? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This talk is about the Manin-Mumford conjecture, which was proven by M. Raynaud in 1983. The required theory will be presented, including abelian varieties. The first and simplest version of the theorem is as follows: Given a nonzero \\(f\\in\\mathbb{C}[X,Y]\\), there exist only finitely many pairs \\((q_1,q_2)\\in\\mathbb{Q}\\) with \\(f(\\mathrm{e}^{2\\pi\\mathbf{i}q_1},\\mathrm{e}^{2\\pi\\mathbf{i}q_2})=0\\), unless there is a very special reason: \\(f\\) contains a factor of the form \\(X^nY^m-\\mathrm{e}^{2\\pi\\mathbf{i}q}\\) or \\(X^n-Y^m\\mathrm{e}^{2\\pi\\mathbf{i}q}\\).</div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://ethz.ch/en/news-and-events/events/inaugural-farewell-introductory-lectures.html">Inaugural Lectures</a></div><br /><div class="event_speaker">Prof. Dr. Yuansi Chen (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">The cost of turning random walks into reliable statistical uncertainty quantification</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room F 30</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://ethz.ch/en/news-and-events/events/inaugural-farewell-introductory-lectures.html">Inaugural Lectures</a></div><br /><div class="event_speaker">Prof. Dr. Hyunju Kwon (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">A glimpse of hydrodynamic turbulence</div><div class="event_time">17:45 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room F 30</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, April 2      </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"> Adam Kanigowski (University of Maryland)</div><div class="event_title">Sparse Equidistribution Problems in Dynamics</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/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Constantin Kogler (University of Oxford)</div><div class="event_title">On dimension and absolute continuity of self-similar measures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will present my recent joint work with Samuel Kittle. We establish numerous novel explicit examples of absolutely continuous self-similar measures. In fact, we give the first inhomogenous examples in dimension 1 and 2 and construct examples for essentially any given rotations and translations, provided they have algebraic coefficients. Moreover we strengthen Varju\'s result for Bernoulli convolutions and Lindenstrauss-Varju\'s result in dimension >= 3. We also generalise Hochman\'s result to contracting on average measures and show that a separation condition weaker than exponential separation is sufficient.</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_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. Danilo Lewanksi (University of Trieste)</div><div class="event_title"> On the DR/DZ equivalence  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />There are two main recipes to associate to a Cohomological Field Theory (CohFT) an integrable hierarchy of hamiltonian PDEs: the first one was introduced by Dubrovin and Zhang (DZ, 2001), the second by Buryak (DR, 2015). It is interesting to notice that the latter relies on the geometric properties of the Double Ramification cycle — hence the name DR — to work. As soon as the second recipe was introduced, it was conjectured that the two had to be equivalent in some sense, and it was checked in a few examples. In the forthcoming years several papers followed, checking more examples of CohFTs, making the conjecture more precise, proving the conjecture in low genera, and eventually turning the statement of the conjecture in a purely intersection theoretic statement on the moduli spaces of stable curves. Lately, the conjecture was proved in its intersection theoretic form, employing virtual localisation techniques. (j.w.w. Blot, Rossi, Shadrin).</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://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"> Daniel Huybrechts (Bonn)</div><div class="event_title">The Tate-Shafarevich group of a polarised K3 surface (Bernoulli Center program)</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/tggroup/doku.php?id=fables">Séminaire "Fables Géométriques" </a></div><br /><div class="event_speaker"> Young-Hoon  Kiem  (Korea Institute for Advanced Study)</div><div class="event_title">Generalized sheaf counting <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />It is well known that many problems in algebraic geometry are reduced to finding vector bundles or sheaves with desired properties. To enumerate them, we construct their moduli spaces and apply intersection theory. To get a moduli space with an intersection theory, we have to pick a stability condition and delete unstable objects. In good circumstances where there are no strictly semistable sheaves, integrating cohomology classes against the (virtual) fundamental class gives us enumerative invariants like Donaldson invariant, Seiberg-Witten invariant and Donaldson-Thomas invariant. However when there are strictly semistable sheaves, the moduli space is an Artin stack on which integration doesn\'t make sense under current technology. Generalized sheaf counting is about finding a way to modify the moduli space of semistable sheaves to get a Deligne-Mumford stack by which an enumerative invariant can be defined. The first method is due to Frances Kirwan who constructed a partial desingularization of the moduli space of vector bundles over a smooth projective curve of fixed degree and rank. The second method is due to Takuro Mochizuki who applied the idea of Michael Thaddeus to construct a generalized Donaldson invariant. In this talk, I will report recent progresses on generalized sheaf counting from curves to 3-folds.  .</div><div class="event_time">14:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</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/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Séminaire de Topologie </a></div><br /><div class="event_speaker"> Severin Bunk (University of Hertfordshire)</div><div class="event_title"><a class="external" href="https://www.google.com/search?client=safari&rls=en&q=epfl+topology+seminar+2025&ie=UTF-8&oe=UTF-8">Infinitesimal higher symmetries and connections on higher bundles</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Infinitesimal higher symmetries and connections on higher bundlesAbstract: Every principal bundle on a manifold has a universal symmetry group. It controls equivariant structures, and its tangent Lie algebra controls connections on the bundle.In this talk we extend these concepts to higher, or categorified bundles. We will use a family&#8208;version of the Lurie-Pridham Theorem from derived deformation theory to compute the associated L_&#8734;-algebras, or rather L_&#8734;-algebroids. That allows us to provide a unified definition of connections on higher bundles and an algebraic formulation of differential cohomology. We elaborate in particular on the case of higher U(1)&#8208;bundles, or n&#8208;gerbes. This is joint work with Lukas Müller (Perimeter Institute), Joost Nuiten (Toulouse) and Richard Szabo (Heriot-Watt).</div><div class="event_time">14:15 &bull; <a class="external" href="https://epfl.zoom.us/j/67128377719?pwd=66bgm6rdbnaPX8XiAZfSwtqnfauQE3.1">EPF Lausanne</a></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"> Emil Wiedemann (FAU Erlangen)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-analysis-and-mathematical-physics-emil-wiedemann-fau-erlangen/">Strong Convergence of Vorticity in the 2D Incompressible Viscosity Limit</a> <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">15:00 &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://stat.ethz.ch/events/research_seminar">Research Seminar in Statistics</a></div><br /><div class="event_speaker"> Linbo Wang (University of Toronto)</div><div class="event_title">The synthetic instrument: From sparse association to sparse causation <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In many observational studies, researchers are often interested in studying the effects of multiple exposures on a single outcome. Standard approaches for high-dimensional data such as the lasso assume the associations between the exposures and the outcome are sparse. These methods, however, do not estimate the causal effects in the presence of unmeasured confounding. In this paper, we consider an alternative approach that assumes the causal effects in view are sparse. We show that with sparse causation, the causal effects are identifiable even with unmeasured confounding. At the core of our proposal is a novel device, called the synthetic instrument, that in contrast to standard instrumental variables, can be constructed using the observed exposures directly. We show that under linear structural equation models, the problem of causal effect estimation can be formulated as an &#8467;0-penalization problem, and hence can be solved efficiently using off-the-shelf software. Simulations show that our approach outperforms state-of-art methods in both low-dimensional and high-dimensional settings. We further illustrate our method using a mouse obesity dataset. </div><div class="event_time">15:15 &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://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Andrea Di Giusto (Eindhoven University of Technology)</div><div class="event_title">To Generalized Weights... and Beyond: New (and Old) Invariants for Linear Codes <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Generalized Hamming Weights (GHW) have seen a big rise in popularity since Victor Wei described their many properties in 1991, linking them to code performance on the wire-tap channel of type 2. Many equivalent definitions have been proposed, including one relating them to Optimal Linear Anticodes by Ravagnani (2016): Anticodes (codes whose dimension is equal to the maximal weight) can be used as a family of test codes to determine the GHW (when the base field is not the binary field). The properties of GHW can then be inferred by the properties of the family of Anticodes.<br> In this talk, we further extend the approach to arbitrary families of test codes, focusing on a minimal set of assumptions yielding invariants with good duality properties (that is, similar to those proved by Wei for GHW). In doing so, we show that our approach is independent of the chosen metric: in particular, we recover in a unique result the duality of generalised weights in the Hamming and rank metrics. This level of generality also allows us to tackle the problem of duality of generalised weights in the sum-rank metric, by showing a first example of codes with nontrivial Hamming and rank metric parts for which the duality of generalised weights holds. Finally, we investigate the invariants obtained by using the family of Singleton-optimal codes (MDS/MRD codes) in place of Anticodes, highlighting similarities and differences between the two families that reflect on the properties of the obtained invariants. This is joint work with Elisa Gorla and Alberto Ravagnani.</div><div class="event_time">15:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 28</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Dinakar Ramakrishnan (Caltech)</div><div class="event_title">Horizontal anticyclotomic twists of L-functions of elliptic curves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This talk will discuss non-vanishing at the critical center of dihedral twists of L-functions (or their derivatives, depending on the root number) of elliptic curves E over Q by anticyclotomic characters \\chi of prime conductor  P (for varying P) of an imaginary quadratic field K. There are consequences for the rational points and the Tate-Shafarevic group along \\chi.This work is joint with Philippe Michel and was inspired by a wonderful (vertical) result in anticyclotomic Z_p-extensions of K by Cornut and Vatsal, establishing a conjecture of Mazur.</div><div class="event_time">15:15 &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/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Leonid Monin (EPFL)</div><div class="event_title">Geometry of matrix inversion <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 explain how to invert matrices using an action of algebraic torus on certain algebraic varieties. Along the way, I will recall the construction of permutohedral toric variety and the space of complete quadrics, and explore the connection between them. As an application, I will present a recent polynomiality result for characteristic numbers of quadrics which was conjectured by Sturmfels and Uhler. Only very basic knowledge of algebraic geometry is needed.</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_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Dr. Andrea Basso (IBM Research Zürich)</div><div class="event_title">SQIsign: New Trends and a Complete Security Proof <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />SQIsign is the leading digital signature protocol based on isogenies and the only isogeny-based construction in the NIST standardisation process. In this talk, we introduce the SQIsign protocol, presenting its design and its connections to the most fundamental isogeny problems. We also discuss the many variants of SQIsign that have appeared over the last few years, with a particular focus on the recent changes that have become the round-2 NIST submission. Lastly, we discuss some recent results that provide a formal and complete proof of security of SQIsign, which fills a long-standing gap in the literature.</div><div class="event_time">16:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 28</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/sam/news-and-events/zhacm-colloquia">Zurich Colloquium in Applied and Computational Mathematics</a></div><br /><div class="event_speaker">Prof. Dr. Pavel Exner (Nuclear Physics Institute of the CAS)</div><div class="event_title">Localized states in soft waveguides and quantum dot arrays <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The talk discusses a class of Sch¨odinger operators the potentials of whichare channels of a fixed profile, focusing on relations between the spectrum of such an operator and the channel geometry. We provide different sufficient conditions under which a non-straight but asymptotically straight channelgives rise to a non-empty discrete spectrum. We also address the groundstate optimalization problem in case of a loop-shaped configuration, and consider a modification of the model where the channel is replaced by an array of potential wells, each exhibiting a rotational symmetry.</div><div class="event_time">16:30 &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://math.ethz.ch/s/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Armand Riera (Sorbonne Université, LPSM)</div><div class="event_title">The scaling limit of random planar maps with large faces <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 consider large Boltzmann stable planar maps with index $\\alpha\\in(1,2)$. In recent joint work with Nicolas Curien and Grégory Miermont, we established that this model converges, in the scaling limit, to a random compact metric space that we construct explicitly. The goal of this presentation is to outline the main steps of our proof. We will also discuss various properties of the scaling limit, including its topology and geodesic structure.</div><div class="event_time">17:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room  H12</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, April 3      </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"> Valentin Comment (Basel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-valentin-comment-basel/">Bernoulli introduces Low Rank Approximation for matrices</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Low rank approximation of matrices play a central role in today\'s data analysis and scientific computing. Large dense matrices $M$ of size $m 	imes n$ are common in applications since the data often consists of $m$ objects described by $n$ features. In many cases, an important step in data analysis is to build a compressed representation of $M$ that may be easier to manipulate and analyze while accurately characterizing the potential error made. In this talk, we will discuss the main approaches for efficiently constructing compressed approximate representations of matrices, such as random orthogonal projection-based methods and column/row sampling methods. The intuition behind those techniques gave rise to the current most known efficient algorithms that yield low rank approximation of matrices. abstract</div><div class="event_time">12:15 &bull; Universität Basel, Seminarraum 05.001, Spiegelgasse 5</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.unil.ch/dsa/en/home/menuinst/seminaires--evenements/research-seminars.html">Talks in Actuarial Mathematics </a></div><br /><div class="event_speaker"> Dmitry Korshunov (University of Lancaster)</div><div class="event_title">Tail asymptotics for a random walk stopped at random time <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We consider a random walk S_n with a finite positive drift that is stopped at a random time tau having intermediate regularly varying distribution. We assume that the jump distribution is lighter than that of $\\tau$. Under these conditions we show that the distributions of S_{tau} and of  M_{tau} = max_{k &lt;= tau} S_k are tail equivalent and their common tail asymptotics are determined by that of tau, while S_n only contributes via the law of large numbers. We consider the two cases, where $\\tau$ is a random time independent of the future increments of the random walk or tau is arbitrary dependent of S_n.In the course of the talk we will discuss why quite often the class of intermediate regularly varying distributions is more appropriate than the class of regularly varying distributions. We will also discuss in detail the importance of the notion of a random time independent of the future, which includes both stopping times and independent times.Joint work with S. Foss (Edinburgh).</div><div class="event_time">14:00 &bull; EPF Lausanne, Extranef 125</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/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Prof. Dr. Annalaura Stingo (Ecole Polytechnique)</div><div class="event_title">Trivial resonances for a system of Klein-Gordon equations and statistical applications <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the derivation of the kinetic equation from the cubic NLS, a key feature is the invariance of the Schrödinger equation under the action of U(1), which allows the quasi-resonances of the equation to drive the effective dynamics of the correlations. In this talk, I will give an example of equation that does not enjoy such type of invariance and show that the exact resonances always take precedence over quasi-resonances. As a result, the effective dynamics is not of kinetic type but still nonlinear and non-trivial. I will present the problem, the ideas behind the derivation of the effective dynamics and some elements of the proof. This is based on a soon-to-appear work in collaboration with de Suzzoni (Ecole Polytechnique) and Touati (CNRS and Université de Bordeaux).</div><div class="event_time">16:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 46</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">Dr. Adrian Riekert (University of Münster)</div><div class="event_title">Convergence of gradient methods in the training of neural networks <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We study the situation of optimizing artificial neural networks (ANNs) with the rectified linear unit activation via gradient flow (GF), the continuous-time analogue of gradient descent. Under suitable regularity assumptions on the target function and the input data of the considered supervised learning problem, we prove that every non-divergent GF trajectory converges with a polynomial rate of convergence to a critical point. The proof relies on a generalized Kurdyka-Lojasiewicz gradient inequality for the risk function. Furthermore, in a simplified shallow ANN training situation, we show that the GF with suitable random initialization converges with high probability to a good critical point with a loss value very close to the global optimum of the loss.</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, April 4      </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"> Boris Bukh (Carnegie Mellon University)</div><div class="event_title">Discrete Geometry</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_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/forschung/mathematik/seminar-in-numerical-analysis">Seminar in Numerical Analysis</a></div><br /><div class="event_speaker"> Théophile Chaumont-Frelet (Inria Lille)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-in-numerical-analysis-theophile-chaumont-frelet-inria-lille/">Reliable and efficient a posteriori error estimates for the time-dependent wave equation</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The wave equation is a basic PDE model central to a plethora of physical and engineering applications, with such applications requiring approximate solutions obtained by numerical schemes. In this talk, I will focus on the space semi-discretization of the wave equation with a finite element method (and assume that time integration is exactly performed). In the context of finite element methods, a posteriori error estimates are a now widely established technique to rigorously control the discretization error, and to drive adaptive processes where the finite element mesh is iteratively refined. However, although a posteriori error estimates are widely available for elliptic and parabolic problems, the literature is much scarcer for hyperbolic problems, including the time-dependent wave equation. In this talk, I will discuss a new a posteriori error estimator that hinges on ideas previously developed for the Helmholtz equation (the time-harmonic version of the wave equation). To the best of my knowledge, this new error estimator is the first to provide both an upper and a lower bound for the error measured in the same norm. I will also briefly quickly discuss preliminary results concerning time discretization, and application to adaptive algorithms. For further information about the seminar, please visit this webpage .</div><div class="event_time">11:00 &bull; Universität Basel, Room 05.001, Spiegelgasse 5, 4051 Basel</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Riccardo  Montalto  (Univ. Milan)</div><div class="event_title">Small and large amplitude quasi-periodic waves in Fluid Mechanics <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 shall discuss some recent results about the construction of small and large amplitude quasi-periodic waves in Euler equations and other hydro-dynamical models in dimension greater or equal than two. I shall discuss quasi-peridic solutions and vanishing viscosity limit for forced Euler and Navier-Stokes equations and the problem of constructing quasi-periodic traveling waves bifurcating from Couette flow (and connections with inviscid damping).  I also discuss some results concerning the construction of large amplitude quasi-periodic waves in rotating fluids. The techniques are of several kinds: Nash-Moser iterations, micro-local analysis, analysis of resonances in higher dimension, normal form constructions and spectral theory.</div><div class="event_time">14:15 &bull; EPF Lausanne, MA A1 12</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"> Judith Rosseau (University of Oxford)</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://ethz.ch/en/news-and-events/events/inaugural-farewell-introductory-lectures.html">Inaugural Lectures</a></div><br /><div class="event_speaker">Prof. Dr. Stefan Kurz (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Maxwell - Kálmán - Bosch: How Math Powers Progress</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room F 30</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>';