var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-75"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-73"><img src="//www2.math.ethz.ch/smsjs/images/arrow_right.png"/></a></div>    <div class="sms_title">      <span style="float: left;">SMS</span>      <span>SWISS MATHEMATICAL SOCIETY</span>      <span style="float: right;">SMG</span>    </div>    <div class="sms_info">      <span style="float: left; width: 250px;">Bulletin no. 10</span>      <span style="float: right; text-align:right; width: 250px;">20.11 - 24.11.2023</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Autumn Semester 2023</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, November 20      </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"> Anne Schnattinger (University of Basel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-anne-schnattinger-university-of-basel/">Smooth Irreducible Curves in the Projective Space of Small Degree and Genus</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p><a href="https://dmi.unibas.ch/fileadmin/user_upload/dmi/Studium/Mathematik/Bernoullis_Tafelrunde/_HS23/Anne_Schnattinger.pdf" target="_blank">abstract</a>&lt;/p></div><div class="event_time">12:15 &bull; Universität Basel</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/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker"> David O\'Connell (Okinawa Institute of Science and Technology)</div><div class="event_title">Topology Change from Pointlike Sources <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />https://www.math.uzh.ch/mat074</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_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Prof. Dr. Françoise Pène (Université de Brest)</div><div class="event_title">Probabilistic limit theorems for the periodic Lorentz gas and for the geodesic flow on a Z^d-cover of a negatively curved compact surface <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The two models mentioned in the title are natural examples of dynamical systems preserving an infinite measure. Because of their periodicity, they can be represented by a Z^d-extension over a chaotic probability preserving dynamical system (resp. Sinai billiard, geodesic flow on a compact surface). Thus, their ergodic properties are closely related to those of the underlying probability preserving chaotic system (studied namely by Sinai, Bunimovich, Chernov, Young, Ratner, Pesin, etc.) and in particular with the local limit theorem established by resp. Domokos Szász and Tamás Varjú and Yves Guivarc\'h and J. Hardy. When the horizon is finite, the free flight is bounded, and powerful tools can be used to establish many strong results, such as quantitative recurrence results, expansions in mixing, limit theorems for Birkhoff sums, for pin-ball, for non-stationary Birkhoff sums and for solutions of perturbed differential equations (results in collaboration with Benoît Saussol, with Dima Dolgopyat and Péter Nándori, with Damien Thomine, results by Nasab Yassine and Maxence Phalempin). Finally we will also state results in the more difficult case of the Lorentz gas in infinite horizon (results in collaboration with Dalia Terhesiu, and also with Ian Melbourne).</div><div class="event_time">15:00 &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_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="http://www.iaa.tu-bs.de/konmerz/gausseminar/">GAuS Seminar</a></div><br /><div class="event_speaker">Dr. Xiaoyan Su (Loughborough University)</div><div class="event_title">The W^{s,p}-boundedness of wave operators for the Schrödinger operator with inverse-square potential <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 focus on the Schrödinger operator withinverse-square potential L_a=&#8722;\\Delta+a/|x|^2, a\\geq&#8722;(d&#8722;2)^2/4, d\\geq2.We will discuss the boundedness of wave operators in certain Sobolevspaces, which lead to a series of interesting inequalities, such asdispersive estimates, Strichartz estimates and uniform Sobolevinequalities. We will explain how to construct the wave operators usingMellin transform and spherical harmonic decomposition, and prove thatthey are W^{s,p}-bounded for certain p and s which depend on a. Thistalk is based on joint work with Changxing Miao and Jiqiang Zheng.</div><div class="event_time">17:00 &bull; Online via Zoom</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. Simon Machado (ETH)</div><div class="event_title"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Aperiodic order beyond Euclidean spaces</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The theory of aperiodic order is concerned with the study of discrete sets - usually of Euclidean spaces - that are aperiodic but exhibit long-range order. Within that framework Meyer sets are key objects of study that are used to model quasi-crystals, aperiodic tilings (Penrose, the `hat’) and sets of number-theoretic origin (Pisot numbers). A fundamental result in the theory is a beautiful classification of Meyer sets due to Meyer that relates them to the so-called `cut-and-project schemes’. Aperiodic order naturally extends beyond Euclidean spaces: notions of aperiodicity and long-range order are also natural in the setting of hyperbolic spaces, symmetric spaces, and all kinds of homogeneous spaces (i.e. spaces with a transitive group of isometries). I will discuss recent developments in the theory of `non-commutative aperiodic order’ with the extensions of Meyer’s theorem as my main focus.</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, November 21      </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"> Bruno Duchesne (Université Paris-Saclay)</div><div class="event_title">Maximal representations and hermitian symmetric spaces of infinite dimension <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> In this talk, a family of infinite dimensional Hermitian symmetric spaces will be introduced and a rigidity theorem for complex hyperbolic lattices acting by isometries on such symmetric spaces will be presented. The context of this result will be given in order to explain why one can be interested in such result.</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"> Elena Sammarco (Università Roma Tre)</div><div class="event_title">Divisors in the moduli space of cubic fourfolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In his Ph.D. thesis, Brendan Hassett introduced the definition of special cubic fourfolds, the ones that contain a surface not homologous to a complete intersection. They have rich geometric properties that in many cases involve K3 surfaces. Also, they form a countably infinite union of divisors Cd in the moduli space C of cubic fourfolds. In this context, in which we find some conjectures on the rationality of the cubic fourfold, it is interesting to know what happens outside these divisors. I\'ll show a very explicit method to construct some non-special divisors in C.</div><div class="event_time">10:30 &bull; Universität Basel, Spiegelgasse 5, Seminarraum 05.001</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"> Mogens Bladt (University of Copenhagen, Denmark)</div><div class="event_title">Bond price modelling using continuous-time Markov chains <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Bond prices are based on the expected accumulation of a stochastic interest rate, the spot rate. Well-known spot rate models include Vasicek and CIR, which are based on stochastic differential equations. In this talk, we present an alternative description of the spot rate in terms of a finite state-space Markov process, where the spot rates are piecewise deterministic (or even constant) in the different states. In this so-called Markovian interest model, we show that the bond price coincides with the survival function of a phase-type distribution. This striking coincidence allows for calibrating a Markovian interest rate model (using maximum likelihood) to observed data (prices) or other theoretical models. In life insurance models, discounting by stochastic interest rates is usually dealt with by assuming independence and converting the stochastic rates into deterministic forward rates. A problem with this approach is that the computation of reserves and premiums becomes much more involved since Thiele\'s differential equation no longer remains valid. We discuss how the Markovian interest model can be used as an alternative in multi-state life insurance models and how the spot rates naturally integrate into formulas for reserves, moments of future payments and equivalence premiums.</div><div class="event_time">11:00 &bull; EPF Lausanne, UniL campus, Extranef - 109</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. Dennis Eriksson (Chalmers University)</div><div class="event_title">Relative intersection theory and the Riemann-Roch theorem <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Together in recent work with G. Freixas, we study a relative intersection theory, with values in line bundles, originally introduced by Deligne and developed by e.g. Elkik. Whereas one usually intersects n divisors on an n-dimensional variety and gets a number, here intersects n+1 divisors and gets a line. &lt;BR> It amounts to a categorical refinement of direct images in Chow-theory. We introduce a formalism and categorical framework that allows us to give life to many of the usual intersection theoretic notions to categorified levels. &lt;BR> A great motivation for developing this was to study categorified versions of the Grothendieck-Riemann-Roch theorem, conjectured by Deligne. While being of general interest, it has also turned out to be important in Arakelov theory, algebraic geometry, mirror symmetry, and other fields. I will also report on some partial results in this direction.</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"> Davide Palitta (Università di Bologna)</div><div class="event_title">Sketched and truncated Krylov subspace methods for matrix equations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Sketching can be seen as a randomized dimensionality reduction technique able to preserve the main features of the original problem with probabilistic confidence.This kind of technique is emerging as one of the most promising tools to boost numerical computations and it is quite well-known by theoretical computer scientists.Nowadays, sketching is gaining popularity also in the numerical linear algebra community even though its use and understanding are still limited.In this talk we will present cutting-edge results about the use of sketching in numerical linear algebra. In particular, we will focus on showing how sketching can be successfully combined with Krylov subspace methods. We will specialize our results to the solution of large-scale matrix equations, but similar techniques can be applied to a variety of important algebraic problems, including the solution of linear systems, eigenvalue problems, and the numerical evaluation of matrix functions.This talk is based on joint work with Valeria Simoncini and Marcel Schweitzer.</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_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"> Omar Kidwai (Birmingham)</div><div class="event_title">Topological recursion, exact WKB analysis, and the (uncoupled) BPS Riemann-Hilbert problem <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The notion of BPS structure describes the output of the Donaldson-Thomastheory of CY3 triangulated categories, as well as certain four-dimensional N=2QFTs. Bridgeland formulated a certain Riemann-Hilbert-like problemassociated to such a structure, seeking functions in the &#8463;plane with givenasymptotics whose jumping is controlled by the BPS (or DT) invariants, whichappear in the description of certain complex hyperkahler manifolds.To solve a totally different problem in physics, Chekhov and Eynard-Orantinintroduced the topological recursion, which takes in very similar initial data andrecursively produces an infinite tower of geometric objects, which have beenshown to be useful in enumerative geometry.Starting from the datum of a quadratic differential on a Riemann surface X, I\'llbriefly recall how to associate a BPS structure to it, and explain, in the simplestexamples, how to produce a solution to the corresponding Riemann-Hilbertproblem using a procedure called topological recursion, together with exactWKB analysis of the resulting "quantum curve". Based on joint work with K.Iwaki.</div><div class="event_time">15:00 &bull; Université de Genève, Section de mathématiques, 7-9 rue du Conseil-Général, 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">Silvia Sconza (Universität Zürich)</div><div class="event_title">What is... Isogeny-Based Cryptography? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />\'\'In cryptography, we are always looking for hard mathematical problems on which to build secure protocols for exchanging messages. Current cryptography is based on the difficulty of integer factorisation and the Discrete Logarithm Problem. Unfortunately, both of these problems can be solved on (sufficiently powerful) quantum computers in an acceptable time thanks to Shor\'s algorithm (1994). Hence the need to look for new problems that are also hard on quantum computers. A good proposal in this direction is the Isogeny Path Problem, which gave rise to Isogeny-Based Cryptography. We will take a friendly look at the problem and the cryptosystems based on it.</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_ne"><a class="external" href="https://unine.ch">Université de Neuchâtel</a></div><div class="event_type"><a class="external" href="http://www.unine.ch/math/home/colloques_et_seminaires/les-colloques-du-mardi.html">Colloque du Mardi </a></div><br /><div class="event_speaker"> Tal Horesh (ETHZ)</div><div class="event_title">Equidistribution of Lattices. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Some of the most classical problems in number theory concern counting primitive vectors inside increasing subsets of R^n. Primitive lattices are the higher dimensional analog of primitive vectors, and therefore many counting and equidistribution problems regarding primitive vectors can be generalized to primitive lattices. I will talk about counting and equidistribution of primitive lattices, as well as its application to the distribution of free rational points on the Grassmannian.  This is based on joint works with Yakov Karasik, and with Tim Browning and Florian Wilsch.</div><div class="event_time">17:00 &bull; Université de Neuchâtel, Institut de Mathématiques, B103</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">Dr. Sylvain Calinon (Idiap Research Institute / EPFL)</div><div class="event_title">Robot learning from few samples by exploiting the structure and geometry  of data <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Today\'s developments in machine learning heavily focus on big data approaches. However, many applications in robotics require learning approaches that can rely on only few demonstrations or trials. The main challenge boils down to finding structures that can be used in a wide range of tasks, which requires us to advance on several fronts, including data structures and geometric structures.As example of data structures, I will discuss the use of tensor factorization techniques that can be used in global optimization problems to efficiently extract and compress information, while providing diverse human-guided learning capabilities (imitation and environment scaffolding). As examples of geometric structures, I will discuss the use of Riemannian geometry and geometric algebra in robotics, where prior knowledge about the physical world can be embedded within the representations of skills and associated learning algorithms.</div><div class="event_time">17:15 &bull; Université de Fribourg, room Phys 2.52</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, November 22      </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/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Dr. Johannes Schmitt (ETH Zürich)</div><div class="event_title">Log intersection theory: from toric varieties to moduli of curves IV</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Jinyeop Lee (LMU Munich)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-analysis-and-mathematical-physics-jinyeop-lee-lmu-munich/">Microscopic derivation of a nonlinear Schrödinger equation with a nonlinear point interaction in 1D</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>The study of the Schrödinger equation in dimension one with a nonlinear point interaction has been the focus of research over the past few decades. In this seminar, we talk about a work on deriving this partial differential equation as the effective dynamics of N identical bosons in one dimension.<br/> We assume introducing a tiny impurity located at the origin and considering that the interaction between every pair of bosons is mediated by the impurity through a three-body interaction. Moreover, by assuming short-range scaling and choosing an initial fully condensed state, we prove convergence of one-particle density operators in the trace-class topology. This is the first derivation of the so-called nonlinear delta model. This research is a collaborative work with Prof. Riccardo Adami.&lt;/p></div><div class="event_time">14:00 &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/s/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Rima Chatterjee (University of Cologne)</div><div class="event_title">Knots in overtwisted manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Knots in contact manifolds are interesting objects to study. Contact structures come in two flavors- tight and overtwisted. In this talk, I\'ll focus on knots in overtwisted manifolds. The knots that we really care about in this setting are known as non-loose or exceptional knots. I\'ll define what these knots are and then mention some of their existence and classification results. If time permits, I\'ll talk about how one can contruct a family of non-loose knots via cabling. This is based on joint work with Etnyre, Min and Mukherjee. No background knowledge of contact topology will be assumed.</div><div class="event_time">15:45 &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://math.ethz.ch/s/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Daniel Ueltschi (University of Warwick)</div><div class="event_title">The Kac-Ward solution of the 2D Ising model <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Onsager proposed a closed-form expression of the free energy of the Ising model in 1944. The method of Kac and Ward is particularly elegant and it has recently be made rigorous by Lis and Aizenman-Warzel. I will show how to extend it to the triangular lattice, with coupling constants of arbitrary signs.This is ongoing work with Georgios Athanasopoulos.</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, November 23      </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"> Javier Fresán (Sorbonne Université)</div><div class="event_title">E-functions and 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_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"> Alessandro Giacchetto (ETHZH)</div><div class="event_title">Resurgent large genus asymptotics of intersection numbers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Factorials can be recursively computed through their definition, but the computation gets difficult quite quickly whenthe number of interest gets larger and larger. A workaround is given by Stirling’s approximation: a closed, asymptotic formula for factorials. A similar (but much more complicated) situation occurs when trying to compute Witten’s intersection numbers. Virasoroconstraints recursively compute these numbers, but the computation gets difficult when the genus gets larger and larger. An approximation has been recently proved by Aggarwal by studying the structure of the associated Virasoro constraints. I will present analternative proof of Aggarwal’s result based on quantum curves and resurgence. The advantage of this strategy is that it easily generalises to several problems (such as r-spin intersection numbers, Norbury’s intersection numbers, etc) and gives higher-ordercorrections. Based on the joint work with B. Eynard, E. Garcia-Failde, P. Gregori, and D. Lewa&#324;ski.</div><div class="event_time">13:15 &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://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Victor Reis (UW - IAS)</div><div class="event_title">The Subspace Flatness Conjecture and Faster Integer Programming <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In a seminal paper, Kannan and Lovász (1988) considered a quantity \\mu_{KL}(\\Lambda,K) which denotes the best volume-based lower bound on the covering radius \\mu(\\Lambda,K) of a convex body K with respect to a lattice \\Lambda. Kannan and Lovász proved that \\mu(\\Lambda,K) \\leq n \\cdot \\mu_{KL}(\\Lambda,K) and the Subspace Flatness Conjecture by Dadush (2012) claims a O(\\log n) factor suffices, which would match the lower bound from the work of Kannan and Lovász.We settle this conjecture up to a constant in the exponent by proving that \\mu(\\Lambda,K) \\leq O(log^3(n)) \\cdot \\mu_{KL} (\\Lambda,K). Our proof is based on the Reverse Minkowski Theorem due to Regev and Stephens-Davidowitz (2017). Following the work of Dadush (2012, 2019), we obtain a (log n)^{4n}-time randomized algorithm to solve integer programs in n variables. Another implication of our main result is a near-optimal flatness constant of O(n log^3(n)). Joint work with Thomas Rothvoss.</div><div class="event_time">14:00 &bull; EPF Lausanne, GA 321</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/kolloquium">Perlen-Kolloquium</a></div><br /><div class="event_speaker"> Tomasz Kacprzak (Swiss Data Science Center, Paul Scherrer Institute/ETH Zürich)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/dmi-kolloquium-tomasz-kacprzak/">A big telescope and a big computer: how HPC and AI will enable next breakthroughs in our understanding of the Universe</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>Tomasz Kacprzak is a Senior Scientist at ETH Zurich and a Senior Data Scientist at the Swiss Data Science Center at the Paul Scherrer Institute. He obtained his PhD in Physics and Astronomy from the University College London, as well as previously a MSc in Machine Learning from the same university. His focus is on interdisciplinary science in physics and artificial intelligence, in particular on applications of machine learning and high-performance computing to solve otherwise-untraceable problems in physics and cosmology. On the cosmology side, he is involved in the Dark Energy Survey project, the Euclid satellite, and the Square Kilometer Array.<br/> More information <a href="http://tomaszkacprzak.github.io" rel="noreferrer" target="_blank">here</a>.&lt;/p>&lt;p>Abstract:<br/> The upcoming mega-telescopes, such as European Space Agency\'s recently launched Euclid satellite, and the upcoming radio Square Kilometer Array (SKA), will provide images of our universe over 10 billion years of cosmic history, and enable us to study its evolution with unprecedented level of detail. In the framework of simulations-based inference, the big telescopes deliver a throve of high-resolution observations and big computers provide the feature-rich numerical theory prediction. By using AI trained on simulations and performing inference on observations, we will be able us to differentiate between complex models of dark matter, dark energy, modified gravity, and astrophysics; a task unattainable by classical pen-and-paper analysis. This way, big computers paired with big telescopes will enable next breakthroughs in our understanding of the universe. In this talk, I will review the current and future applications of HPC and AI in cosmology in astrophysics, focusing on areas where they already play an indispensable role. I will also present a number of yet-unsolved problems in data science, the solutions to which are critical for enabling next generation measurements in cosmology.&lt;/p></div><div class="event_time">16:15 &bull; Universität Basel, Spiegelgasse 5, Raum 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://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Prof. Dr. Antti Knowles (Section of Mathematics, University of Geneva)</div><div class="event_title">Euclidean field theories and interacting Bose gases <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Euclidean field theories have been extensively studied in the mathematical literature since the sixties, motivated by high-energy physics and statistical mechanics. Formally, such a theory is given by a Gibbs measure associated with a Euclidean action functional over a space of distributions. In this talk I explain how some such theories arise as high-density limits of interacting Bose gases at positive temperature. This provides a rigorous derivation of them starting from a realistic microscopic model of statistical mechanics. I focus on field theories with a quartic, local or nonlocal, interaction in dimensions &lt;= 3. Owing to the singularity of the Gaussian free field in dimensions higher than one, the interaction is ill-defined and has to be renormalized by infinite mass and energy counterterms. The proof is based on a new functional integral representation of the interacting Bose gas. Based on joint work with Jürg Fröhlich, Benjamin Schlein, and Vedran Sohinger.</div><div class="event_time">16:15 &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.ethz.ch/mathematik-und-ausbildung/weiterbildung/kolloquium.html">Kolloquium über Mathematik, Informatik und Unterricht</a></div><br /><div class="event_speaker"> Érika  Roldán (Max Planck Institute for Mathematics in the Sciences, Leipzig)</div><div class="event_title">Die Mathematik und Informatik hinter Spielen und Rätseln <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> In diesem Vortrag werden wir die mathematische und rechnerische Modellierungvon Spielen, Videospielen und Puzzles untersuchen, die im Rahmen von Forschungsprojektenin Mathematik und Informatik entwickelt wurden.  Dazu gehören Schiebepuzzles, farbigeWürfel, Tessellierungsprobleme und Kunstgalerieprobleme mit Türmen und Königinnen.Hierbei werden wir Werkzeuge aus der Kombinatorik, diskreten Konfigurationsräumen,diskreter Geometrie, algorithmischem Denken, diskreter Wahrscheinlichkeitstheorie,kombinatorischer Spieltheorie, künstlicher Intelligenz und mehr kennenlernen.Zum Abschluss gibt es eine Ausstellung, bei der jeder die Spiele, Videospiele undPuzzles spielen kann, die im Vortrag vorgestellt wurden.</div><div class="event_time">17:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.1</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/talks-in-financial-and-insurance-mathematics">Talks in Financial and Insurance Mathematics</a></div><br /><div class="event_speaker">Prof. Dr. Sergio Pulido (ENSIIE, Évry, France)</div><div class="event_title">Affine Volterra processes with jumps <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The theory of affine processes has been recently extended to continuous stochastic Volterra equations. These so-called affine Volterra processes overcome modeling shortcomings of affine processes by incorporating path-dependent features and trajectories with regularity different from the paths of Brownian motion. More specifically, singular kernels yield rough affine processes. This paper extends the theory by considering affine stochastic Volterra equations with jumps. This extension is not straightforward because the jump structure and possible singularities of the kernel may induce explosions of the trajectories. This study also provides exponential affine formulas for the conditional Fourier-Laplace transform of marked Hawkes processes. This is joint work with Alessandro Bondi and Giulia Livieri.</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 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://people.math.ethz.ch/~halorenz/dedekind.html">Dedekind Lectures</a></div><br /><div class="event_speaker">Prof. Dr. Vera  Fischer (Kurt Gödel Research Center, Universität Wien)</div><div class="event_title">Combinatorial sets of reals <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 consider some special sets of reals, which on one side originate in realanalysis, general topology and algebra and which on the other can be defined in terms of elementaryset theoretic operations on the reals. These sets carry a surprisingly complex infinite-combinatorialstructure and their study easily brings us to the boundaries of our axiomatic systems. Typical examplesof such special families are maximal almost disjoint families, maximal independent families, boundedand unbounded families, as well as maximal cofinitary groups. We will discuss some recent advancesand trends in their study, and outline interesting remaining open questions.</div><div class="event_time">18:45 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 3</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, November 24      </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/s/number-theory-seminar">Number Theory Seminar</a></div><br /><div class="event_speaker">Prof. Dr. Claudia Alfes-Neumann (Universität Bielefeld)</div><div class="event_title">On harmonic weak Maass forms associated to even integer weight newforms <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 review results on several types of harmonic weak Maass forms that are related to integral even weight newforms.We start with a brief introduction to the theory of harmonic weak Maass forms. These can be related to classical modular forms via a certain differential operator, the so-called \\xi-operator.Starting with an integral weight newform, we will review different constructions of integral weight harmonic weak Maass forms via (generalized) Weierstrass zeta functions that map to the newform under the \\xi-operator.A second construction via theta liftings gives a half-integral weight harmonic weak Maass form whose coefficients are given by periods of certain meromorphic modular forms with algebraic coefficients and periods of the integer even weight newform.This is joint work with Jens Funke, Michael Mertens, and Eugenia Rosu resp. Jan Bruinier and Markus Schwagenscheidt.</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_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"> Jeff Hicks (University of Edinburgh)</div><div class="event_title">Complexity of topological spaces and complexity of triangulated categories <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />There are several different notions of "complexity" for a topological space M. For instance, when M is a manifold one can study: the Lebesgue covering dimension; sum of Betti numbers; minimal number of Morse critical values; or the Lusternik–Schnirelmann category.Similarly, given a triangulated category C, one can measure its complexity using invariants such as the Rouquier dimension; diagonal dimension; or minimal length of presentation as a homotopy colimit. In this talk, I will discuss some of the relations between these categorical invariants and topological invariants when the category C is the Fukaya category of the cotangent bundle of M (equivalently, the category of modules over chains on the based loop space on M). I will mostly focus on -  introducing the above invariants of topological spaces and categories and  - discussing how Lagrangian cobordisms play a role in bounding the diagonal dimension of C in terms of the minimal number of critical values of a Morse function on M.</div><div class="event_time">14:15 &bull; ETH Zentrum, Building NO, Room E 39 + <a class="external" href="https://ethz.ch/staffnet/de/utils/location.html?building=NO&floor=E&room=39">Sonneggstrasse 5, 8092 Zürich</a></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"> Federico Pasqualotto (UC Berkeley)</div><div class="event_title">From Instability to Singularity Formation in Incompressible Fluids <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 describe a new mechanism for singularity formation in the 2d Boussinesq system and in the 3d incompressible Euler equations. In the Boussinesq case, the singularity mechanism arises as a second order effect on the classical Rayleigh–Bénard instability, and the initial data we choose is smooth except at one point, where it has Hölder continuous first derivatives. In addition, the solution is smooth in the angular variable at the blow-up point, which was a fundamental obstruction in previous works. I will finally describe how these considerations translate to a singularity formation scenario for the 3d incompressible Euler equations, based on the Taylor–Couette instability. This is joint work with Tarek Elgindi (Duke University). </div><div class="event_time">14:15 &bull; EPF Lausanne</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"> Marie Dueker (Friedrich-Alexander University, Germany)</div><div class="event_title">Title T.B.A.</div><div class="event_time">15:15 &bull; EPF Lausanne, MA A3 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>';