var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-66"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-64"><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;">24.4 - 28.4.2023</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Spring Semester 2023</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, April 24      </div>      <div class="day_content">        <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="https://www.unine.ch/math/home/colloques_et_seminaires.html">Actualité des Maths </a></div><br /><div class="event_speaker"> Jan Draisma (Universität Bern)</div><div class="event_title">Integer sequences associated to matroids (after Huh and collaborators) <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />June Huh and collaborators proved remarkable theorems about various integer sequences associated to simple combinatorial objects such as graphs or point configurations in vector spaces. Matroids are the right common generalisation of these combinatorial objects. I will introduce matroids, the fundamental operations of deletion and contraction, and several integer sequences associated to matroids. After this introduction, I will formulate some of Huh\'s theorems and sketch some of the ideas that go into their proofs.</div><div class="event_time">10:15 &bull; Université de Neuchâtel, Rue Emile Argand 11, Auditoire B217</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"> Robert Tichy (TU Graz)</div><div class="event_title">Quasi Monte Carlo methods in numerical analysis and insurance <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />For high-dimensional numerical integration Quasi Monte Carlo methods are an appropriate tool. The approximation error can be estimated by the Koksma-Hlawka inequality which involves a certain concept of total variation of the integrand and the so-called discrepancy, measuring the distribution of the used point set in the unit cube.  We discuss various useful concepts of variation and of discrepancy as well as applications to integral equations of the Fredholm type. Furthermore, we consider applications for an insurance surplus process of the Sparre-Andersen type with surplus-dependent premiums. Analytical properties are studied and QMC methods are applied for obtaining solutions to relevant quantities. Numerical examples show that the speed of convergence is satisfactory. This is joint work M. Preischl and S. Thonhauser.</div><div class="event_time">11:00 &bull; EPF Lausanne, UniL campus, Extranef 110</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Stefano Abbate (Universität Basel)</div><div class="event_title">"Non-local" calculus for beginners <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Differential calculus, as developed by Newton and Leibniz, determines the concept of a derivative from the definition of limit. Since this approach depends only "locally" on the point where it is defined, classical differential calculus can be narrow to represent many physical phenomena. Fractional derivatives are one of the oldest and most known approaches to overcome this issue. In the last century, substantial progress has been developed in establishing "non-local" alternatives.<br>The aim of this seminar is to present a rigorous approach to define "non-local"operators and a "non-local" vector calculus, introduced by Du et al. in 2011. The goal is to show the analogy with classical differential operators and classical formulas of differential calculus. In this setting, we arrange some models corresponding to the ones known in elementary physics. In particular, we introduce a "non-local" balance law which leads to the study of a basic elliptic equation. In the last part, we give a brief overview on the study of a more complex model, specifically a "non-local" version of the Cahn-Illiard-Oono equation.</div><div class="event_time">12:15 &bull; Universität Basel, Spiegelgasse 5, SR 05.002</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"> Austin J. Stromme (University of Washington)</div><div class="event_title">New statistical phenomena for entropic optimal transport <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Optimal transport (OT) is a popular framework for comparing and interpolating probability measures, which has recently been used in diverse application areas throughout science, including in generative modeling, cellular biology, graphics, and beyond. Unfortunately, recent work has shown that OT suffers from a severe statistical curse of dimensionality. In practice, however, the un-regularized OT problem is less common than entropically regularized approximations, known as entropic OT, which afford the use of simpler and more scalable algorithms.<br>Motivated by its ubiquity in practice, as well as the curse of dimensionality for its un-regularized counterpart, in this talk we identify two new statistical phenomena for entropic OT in the form of bounds on the convergence rate of empirical quantities to their population counterparts. Our first set of bounds are for high-dimensional settings, and give totally dimension-free convergence, albeit with exponential dependence on the regularization parameter. And our second set of bounds are for data distributions with potentially small intrinsic dimension, in which case we show that the dimension-dependence is not only intrinsic to the data distributions, but in fact is automatically the minimum of the intrinsic dimensions of the two distributions at stake. We show that these phenomena hold for entropic OT value estimation, and more generally for the problems of entropic OT map and density estimation. We conclude with applications to transfer learning and trajectory reconstruction. Our simple proof techniques are inspired by convex optimization, and notably avoid empirical process theory almost entirely.<br>Based on joint work with Philippe Rigollet.</div><div class="event_time">13:15 &bull; EPF Lausanne, Salle GA 3 21 </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. Lucas Mann (University of Munster)</div><div class="event_title">A p-adic 6-Functor Formalism in Rigid-Analytic Geometry <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Using Clausen-Scholze\'s theory of condensed mathematics, we construct a full 6-functor formalism for p-adic sheaves on rigid-analytic varieties. As a special case of this formalism we obtain Poincaré duality for the étale F_p-cohomology of smooth proper rigid-analytic varieties. By applying the formalism to classifying stacks of p-adic groups, we obtain new insights into the p-adic Langlands program.</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://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">Dr. Frédéric Paulin (Université Paris-Saclay)</div><div class="event_title">Partial equidistribution of Farey rays in negative curvature <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the unit tangent bundle of a finite volume Riemannian manifold with negative curvature, a closed strong unstable leaf pushed by the geodesic flow equidistributes towards the maximal entropy measure. Fixing a family of discrete points with geometric origin (intersection with divergent orbits of the geodesic flow) on these unstable leaves, and having care of taking neither too many nor too few points (using a prescribed density), we prove that the family of points equidistributes towards a measure supported on a truncated weak stable leaf. We give arithmetic applications by varying arithmetic hyperbolic manifolds. This is a joint work with Jouni Parkkonen.</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_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"> João Pedro Ramos (ETH Zürich)</div><div class="event_title">Time-frequency localization operators, their eigenvalues and relationship to elliptic PDE <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the classical realm of time-frequency analysis, a classical object of interest is the short-time Fourier transform of a function. This object is a modified Fourier transform of a signal f(x), modified by a certain \'window function\', in order to make joint time-frequency analysis of functions more feasible. Since the pioneering work of Daubechies, time-frequency localisation operators have been of extreme importance in that analysis. These are defined through V^&#8727;1_&#937; V f=P_&#937; f, where V denotes the short-time Fourier transform with some fixed window. These operators seek to measure how much a function concentrates in the time-frequency plane, and thus the study of their eigenvalues and eigenfunctions is intimately connected to the previous questions.<br>In this talk, we will explore the case of a Gaussian window function &#966;(x)=e^{-&#960;x^2}, and the operators thus obtained. We will discuss some classical and recent results on domains of maximal time-frequency concentration, their eigenvalues, and stability/inverse problems associated with such properties. During this investigation, we shall see that many of these problems possess some rather unexpected connections with calculus of variations, overdetermined elliptic boundary value problems and free boundary problems in general.</div><div class="event_time">14:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Sergey Finashin (METU Ankara)</div><div class="event_title">Strong Invariants in Real Enumerative Geometry - Lecture 1 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> In the first lecture I will discuss a signed count of real lines on real projective hypersurfaces, which is independent of thechoice of real structures and in that sense is “strong invariant”. The simplest examples: a signed count of real lines on a real cubic surface gives 3,while a similar count on a real quintic 3-fold gives 15. In the other lectures I will stick to the case of real del Pezzo surfaces and discussa generalization of the signed count of lines to a signed count of rational curves (involving some combinations of the Welschinger numbers).<br>All the results are joint with V.Kharlamov.</div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 6-13</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"> Reto Kaufmann (ETH Zürich)</div><div class="event_title">Symplectic Toric Submanifolds and Faces of the Moment Polytope <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />By Delzant\'s Theorem, symplectic toric manifolds are classified by their unimodular moment polytopes. In this talk, we will discuss the bijection between the faces of the moment polytope and the symplectic toric submanifolds of the corresponding symplectic toric manifold. To study recursive aspects like this, it is useful to generalise the notion of a symplectic toric manifold. First we present how this generalisation works in the local picture, given by symplectic toric representations and unimodular polyhedral cones. Then, we will show how this can be used to establish the global correspondence between submanifolds and faces.</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_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">Prof. Dr. Laura Ciobanu (Heriot-Watt University)</div><div class="event_title"><a class="external" href="https://www.math.unibe.ch/research/talks/colloquium/index_eng.html">Post\'s Correspondence Problem: from computer science to algebra</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Post’s Correspondence Problem is a classical problem in computer science that is famously undecidable, and that acts as a source of undecidability in many areas of algebra, combinatorics, and computer science.Post’s Correspondence Problem (PCP), in its most algebraic formulation, asks whether for a pair of free monoid morphisms g,h : &#931;*&#8594; &#916;* there is any non-trivial element x &#8712; &#931;* such that g(x) = h(x). One can similarly phrase a PCP for general groups, rather than free monoids, by asking whether pairs g,h of group homomorphisms agree on any non-trivial inputs. This leads to interesting and unexpected (un)decidability results for PCP in groups, and connections to important topics in geometric group theory and topology.In this talk I will describe some of the recent advances on the Post Correspondence Problem in group theory, its connections to computer science, and to geometry.</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, April 25      </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.unine.ch/math/home/colloques_et_seminaires/seminaires-de-linstitut.html">Séminaire Groupes et Géométrie </a></div><br /><div class="event_speaker"> Michael Puschnigg (Université d’Aix-Marseille)</div><div class="event_title">Homological invariants of group Banach algebras of discrete groups <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Several conjectures about "assembly maps" in K-theory (Baum-Connes Conjecture) and surgery theory (Borel Conjecture)rank among the most significant open problems about discrete groups. In this talk we will present some recent progress on a similar conjecture about the assembly map in cyclic homology for discrete, cocompact isometry groups of CAT(0)-spaces.</div><div class="event_time">10:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Karoly Böröczky (Alfréd Rényi Institute of Mathematics)</div><div class="event_title">The Isoperimetric inequality, the Brunn-Minkowski theory, and the Lp Minkowski problem</div><div class="event_time">10:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=fables">Séminaire "Fables Géométriques" </a></div><br /><div class="event_speaker"> Sergey Finashin (METU Ankara)</div><div class="event_title">Strong Invariants in Real Enumerative Geometry - Lecture 1 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the first lecture I will discuss a signed count of real lines on real projective hypersurfaces, which is independent of thechoice of real structures and in that sense is “strong invariant”. The simplest examples: a signed count of real lines on a real cubic surface gives 3,while a similar count on a real quintic 3-fold gives 15. In the other lectures I will stick to the case of real del Pezzo surfaces and discussa generalization of the signed count of lines to a signed count of rational curves (involving some combinations of the Welschinger numbers).<br>All the results are joint with V.Kharlamov.</div><div class="event_time">13:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Peter Whalley (University of Edinburgh)</div><div class="event_title">Contraction and Convergence Rates for Discretized Kinetic Langevin Dynamics <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Underdamped (Kinetic) Langevin dynamics is becoming a popular tool for sampling in statistical machine learning and molecular dynamics due to the fact that it has desirable non-asymptotic properties. For some target measure a continuous Langevin diffusion can be constructed to have the target as the invariant measure. In MCMC, Langevin diffusions are discretised to generate samples from the target. The choice of discretisation is very important for the quality of the samples. Popular numerical integrators include Euler-Maruyama, BAOAB and the Stochastic Euler scheme. The quality of a numerical scheme is measured through its bias and its convergence rate. This talk will focus on a framework to provide Wasserstein convergence rates for many different discretisations from machine learning and molecular dynamics which hold for a large range of stepsizes. We will also discuss the property “&#947;-limit convergent” (GLC) to characterise underdamped Langevin schemes that converge to the overdamped dynamics in the high friction limit and which have stepsize restrictions that are independent of the friction parameter; we show that this property is not generic by exhibiting methods from both the class and its complement.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker">Dr. Yi  Zhang  (Chinese Academy of Science)</div><div class="event_title">Stability of geometric inequality: Old and new <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In 2008, Fusco, Maggi, and Pratelli proved the sharp stability of the isoperimetric inequality, an open problem originally raised by Hall in 1992. This inequality states that for any set of finite perimeter $E\\subset \\mathbb R^n$ with $|E|=|B|$ and a barycenter at the origin, one has $ P(E)-P(B)\\ge c(n) |E\\Delta B|^2.$Here, the power $2$ on the right-hand side is optimal. During my talk, I will review some earlier results on improving their proof and share some of my recent joint work with A. Figalli in this direction.</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"> Ilia Gaiur (University of Toronto)</div><div class="event_title">Coadjoint orbits of the truncated loop algebras and degeneration of the Stokes phenomenon <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A naive approach for studying the De-Rham moduli space of flat meromorphic connections with irregular singularities allows to describe such space viacoadjoint orbits of the truncated loop algebras (TLA) attached to each singularity. On the side of the Betti moduli space one needs to attach a set ofStokes matrices and formal monodromy for each singularity of the connection. In the generic case, the order of singularity corresponds to the number ofStokes sectors, but for some specific cases, such as the Airy equation, more detailed analysis is required. In my talk I will explore how the geometry of thegl_n TLA co-adjoint orbits shapes the topology of the Stokes phenomenon for such special cases. In particular I will discuss degeneration of the number ofStokes sectors and local normal forms of the connection dictated by the classes of the coadjoint orbits, and how such normal forms appear in theHamiltonian reduction which corresponds to these coadjoint orbits. I will consider several sl_2 examples which correspond to some Painlev\\\'eequations and discuss in details the underlying geometry of the moduli space.</div><div class="event_time">15:30 &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">Bangxin Wang (Universität Zürich)</div><div class="event_title">What is... quantum topology? <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 introduce quantum topology, which means using representations of quantum groups to construct topological invariants. The starting point of quantum topology is the Jones polynomial for knots and the Reshetikhin Turaev invariant for 3-manifolds. By studying these examples we can see how the concept of quantum groups naturally arises.</div><div class="event_time">16:15 &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"> Julie Deserti (Université d\'Orléans)</div><div class="event_title">Cremona group and holomorphic foliations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />After introducing holomorphic foliations on the complex projective plane and birational self map of the complex projective plane I will mention two problems in which these  two notions are intimately linked:<br> - first I will give a construction that connects holomorphic foliation of degree 2 (resp. 3) and birational involutions (resp. elements of order 3), <br> - second I will prove that any holomorphic codimension 1 foliation on the complex projective plane has exactly one singularity up to the action of an ad-hoc birational map</div><div class="event_time">17:00 &bull; Université de Neuchâtel, Rue Emile Argand 11, Auditoire B013</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_fr"><a class="external" href="https://www.unifr.ch">Université de Fribourg</a></div><div class="event_type"><a class="external" href="https://www.unifr.ch/math/de/info/kolloquium.html">Colloquium </a></div><br /><div class="event_speaker">Prof. Dr. Marc Troyanov (EPFL)</div><div class="event_title">The Gauss-Bonnet-Chern Formula for Riemannian manifolds with conical singularities or conical ends <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 introduce the notion of conical end and  (fibered) conic singularity for a Riemannian manifold and I will present a Gauss-Bonnet formula in this context. The deviation from the classical formula (proved in the 1940s by Allendoerfer, Weil and Chern) is a contribution for each end and each conical singularity of a term which is expressed as a sum of Lipschitz-Killing curvatures. </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, April 26      </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"> Shahar Mendelson (The Australian National University)</div><div class="event_title">Probabilistic methods in Analysis</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_fr"><a class="external" href="https://www.unifr.ch">Université de Fribourg</a></div><div class="event_type"><a class="external" href="https://commonweb.unifr.ch/_Science/Math/Pub/Math/seminars/OSgeom-top.html">Oberseminar Geometrie</a></div><br /><div class="event_speaker">Dr. Patrick Ghanaat (Université de Fribourg)</div><div class="event_title">Geometry of parallelizable manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The subject of the talk is the differential geometry of Riemannianmanifolds carrying a global coframe, expressed in terms of the torsiontensor of the associated flat connection. The basic model spaces in thiscontext are Lie groups furnished with invariant vector fields and theirquotients by discrete subgroups. Other examples are total spaces ofprincipal fibre bundles equipped with a Cartan connection, and all ori-entable three-manifolds. Topics: canonical flat connection and equiv-alence problem, automorphisms, affine transformations and isometries,geodesics and Jacobi fields, local fundamental pseudo-groups, compari-son theorems.</div><div class="event_time">10:20 &bull; Université de Fribourg, room Phys 2.52</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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=symplectic ">Geneva Neuchatel Symplectic Geometry Seminar (GeNeSyS)</a></div><br /><div class="event_speaker"> Lionel Lang (University of Gävle, Sweden)</div><div class="event_title">Measuring holes of hypersurfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In 2000, Mikhalkin introduced a class of real algebraic planar curves now known as simple Harnack curves. Among their many nice properties, these curves appear as spectral curves of planar dimers. In this context, Kenyon and Okounkov showed that any simple Harnack curve is determined by the logarithmic area of some well chosen membranes bounded on the curve (plus some boundary conditions). This is a very special situation since, in general, the areas of these membranes only provide local coordinates on the space of curves under consideration.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 6-13</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"> Ángel Castro (ICMAT, Madrid)</div><div class="event_title">Traveling waves near shear flows <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 the existence of traveling waves arbitrarily close to  shear flows for  the 2D incompressible Euler equations. In particular we shall present some results concerning the existence of such solutions near the Couette, Taylor-Couette and the Poiseuille flows. In the first part of the talk we will introduce the problem and review some well known results on this topic. In the  second one some of the ideas behind the construction of our traveling waves  will be sketched.</div><div class="event_time">14:15 &bull; Universität Basel, Spiegelgasse 5, SR 05.002</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Yuri Santos Rego (University of Magdeburg)</div><div class="event_title">Classical arithmetic groups and their (rational) cohomology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Cohomological information about arithmetic groups is of great interest to algebraists, geometers, and number theorists alike. In this talk we will review some important cohomological properties of (S-)arithmetic groups, looking at concrete examples and some famous results. Among these is a thorem of Lee--Szczarba, stating that the cohomology of SL(n,Z) with rational coefficients is zero in dimension n(n-1)/2. Shifting focus to arithmetic subgroups of classical semisimple groups, we shall see how to obtain --- with the aid of Coxeter groups and buildings --- a generalization of the theorem of Lee--Szczarba: the rational cohomology of such arithmetic groups vanishes in their virtual cohomological dimension.Based on joint work with B. Brück and R. Sroka.</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_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=symplectic ">Geneva Neuchatel Symplectic Geometry Seminar (GeNeSyS)</a></div><br /><div class="event_speaker"> Viatcheslav Kharlamov (Université de Strasbourg)</div><div class="event_title">Unexpected loss of Smith-Thom maximality: the case of Hilbert squares of surfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We explore the maximality of the Hilbert square of maximal real surfaces, andfind that in many cases the Hilbert square is maximal if and only if the surfacehas connected real locus. In particular, the Hilbert square of no maximal K3-surfaceis maximal. Nevertheless, we exhibit maximal surfaces with disconnectedreal locus whose Hilbert square is maximal. (The talk is based on a joint work with R. Rasdeaconu).</div><div class="event_time">16:00 &bull; Université de Genève, Conseil Général 7-9, Room 6-13</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, April 27      </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"> Brita Nucinkis (Royal Holloway, University of London)</div><div class="event_title">Cohomological methods in group theory</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://algebra.dmi.unibas.ch/seminar.html">Seminar Algebra and Geometry</a></div><br /><div class="event_speaker"> Andriy Regeta (Universität Jena)</div><div class="event_title">On the automorphism group of an affine variety  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss properties of the automorphism group of an affine variety. In particular I will discuss some fundamental differences between such a group and algebraic groups as well as groups of birational transformations. </div><div class="event_time">10:30 &bull; Universität Basel, Alte Uni, Seminarraum -201</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_be"><a class="external" href="https://www.unibe.ch">Universität Bern</a></div><div class="event_type"><a class="external" href="https://www.imsv.unibe.ch/research/talks/colloquia/index_eng.html">Colloquia on Probability and Statistics </a></div><br /><div class="event_speaker">Prof. Dr. Peter Kevei (University of Szeged)</div><div class="event_title"><a class="external" href="https://www.imsv.unibe.ch/research/talks/colloquia/index_eng.html">On entropy-rate bounds and two problems in Gaussian database models</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This talk has two independent parts. In the first part of my talk, I will discuss entropy-rates of integer-valued time-series. Originated in information theory as a measure of compressibility, the entropy-rate has been suggested in various studies as a measure of the unpredictability of a given model. While the entropy-rate is well defined for a general stationary time-series, its calculation may be a complicated task, especially in models with relatively large or infinite alphabets. I will present two new upper bounds on entropy-rates of integer-valued time-series, which rely merely on the second-order statistics of the model at hand. In the second part of my talk, I will discuss two related problems concerning Gaussian database models, namely hypothesis testing and alignment recovery. While these two problems have been separately treated in recent studies, I will present a low complexity algorithm that solves them as a joint problem. Theoretical guarantees on the various error probabilities will be provided, and if time permits, I will present some proof ideas.</div><div class="event_time">12:15 &bull; Universität Bern, IMSV, Alpeneggstrasse 22, 3012 Bern, Hörraum -203</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/~palmeran/topsem.html">Séminaire de Topologie et Géométrie </a></div><br /><div class="event_speaker"> Lukas Lewark (Universität Regensburg)</div><div class="event_title"> Untwisting and surfaces in 4-space <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Smooth surfaces in 4-dimensional space are generally easy to construct. In this talk, we will focus instead on surfaces that are topological, but not smooth submanifolds. We will see how they can nevertheless be constructed in a geometric fashion - namely by untwisting. In particular, this allows us to compute for some knots K the minimal genus of a compact oriented topological surface in the four-ball with boundary K.</div><div class="event_time">14:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker"> Miquel Cueca (University of Göttingen)</div><div class="event_title">Shifted Lagrangian structures in Poisson geometry <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 BG carries a 2-shifted symplectic structure. In this talk, I will study the shifted lagrangian groupoids of BG. I will show how many constructions on Poisson geometry unify using the language of shifted symplectic groupoids.This is work in progress with Daniel Alvarez and Henrique Bursztyn.</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_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">Dr. Frank Bretz (Novartis)</div><div class="event_title">Optimal test procedures for multiple hypotheses controlling the familywise expected loss <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We consider the problem of testing multiple null hypotheses, where a decision to reject or retain must be made for each one and embedding incorrect decisions into a real-life context may inflict different losses. We argue that traditional methods controlling the Type I error rate may be too restrictive in this situation and that the standard familywise error rate may not be appropriate. Using a decision-theoretic approach, we define suitable loss functions for a given decision rule, where incorrect decisions can be treated unequally by assigning different loss values. Taking expectation with respect to the sampling distribution of the data allows us to control the familywise expected loss instead of the conventional familywise error rate. Different loss functions can be adopted, and we search for decision rules that satisfy certain optimality criteria within a broad class of decision rules for which the expected loss is bounded by a fixed threshold under any parameter configuration. We illustrate the methods with the problem of establishing efficacy of a new medicinal treatment in non-overlapping subgroups of patients.</div><div class="event_time">16:15 &bull; Universität Basel, Spiegelgasse 5, SR 05.002</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/events/mathematics-colloquia/">Mathematics Colloquium </a></div><br /><div class="event_speaker"> Viviane Baladi (CNRS, Sorbonne Université & ITS-ETH Zürich)</div><div class="event_title">Ergodic properties of Sinai billiards <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Sinai billiards (or dispersive billiards) are (discrete or continuous time) dynamical systems having a simple and natural definition, but offering challenging technical difficulties. These difficulties are due to the presence of singularities, where derivatives blow up. The basic results of the theory were developed nearly 60 years ago by Sinai (ergodicity and mixing of the "physical" invariant measure).<br>Very recently, we were able to adapt functional analytic tools (Ruelle transfer operators acting on anisotropic Banach spaces) to study in particular the properties of other invariant measures. I will briefly describe these tools, and I will present some recent results, ending with the construction of the measure of maximal entropy of generic finite horizon Sinai billiards flows.(Joint work with J. Carrand and M. Demers.)<br><br>Regristration is required : https://forms.gle/KcUAkJzHYj8d7veH6</div><div class="event_time">16:15 &bull; EPF Lausanne, Salle CM 1 5</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"> Sergey Finashin (METU Ankara)</div><div class="event_title">Strong Invariants in Real Enumerative Geometry - Lecture 1 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In the first lecture I will discuss a signed count of real lines on real projective hypersurfaces, which is independent of thechoice of real structures and in that sense is “strong invariant”. The simplest examples: a signed count of real lines on a real cubic surface gives 3,while a similar count on a real quintic 3-fold gives 15. In the other lectures I will stick to the case of real del Pezzo surfaces and discussa generalization of the signed count of lines to a signed count of rational curves (involving some combinations of the Welschinger numbers).<br>All the results are joint with V.Kharlamov.</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Prof. Dr. Massimiliano Gubinelli (University of Oxford)</div><div class="event_title">A stochastic analysis of EQFTs: the forward-backwards equation for Grassmann measures. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will report on a research program to use ideas from stochastic analysis in the context of constructive quantum field theories. Stochastic analysis can be summarized as the study of measures on path space via push-forward from Gaussian measures. The basic example is the Ito map which sends Brownian motion to a Markov diffusion process solution to a stochastic differential equation. Parisi-Wu stochastic quantisation can be understood as a stochastic analysis of an Euclidean quantum field, in the above sense. In this talk I will focus on another way to introduce such an "Ito map" which has connection to the continuous renormalization group a la Polchinski and which uses a forward-backwards stochastic differential equation. In order to be able to give a full non-perturbative construction I will focus on the case of Grassmann measures seen as instances of non-commutative random fields.</div><div class="event_time">16:15 &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_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://www.ntwebseminar.org/">Number Theory Web Seminar</a></div><br /><div class="event_speaker"> Pierre Le Boudec (Universität Basel)</div><div class="event_title"><a class="external" href="https://www.ntwebseminar.org/">2-torsion in class groups of number fields</a> <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 the class number of a number field K of fixed degree n is roughly bounded by the square root of the absolute value of the discriminant of K. However, given a prime number p, the cardinality of the p-torsion subgroup of the class group of K is expected to be much smaller. Unfortunately, beating the trivial bound mentioned above is a hard problem. Indeed, this task had only been achieved for a handful of pairs (n,p) until Bhargava, Shankar, Taniguchi, Thorne, Tsimerman and Zhao managed to do so for any degree n in the case p=2. In this talk we will go through their proof and we will present new bounds which depend on the geometry of the lattice underlying the ring of integers of K. This is joint work with Dante Bonolis. </div><div class="event_time">17:00 &bull; Universität Basel, online Seminar</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_dis"><a class="external" href="https://unidistance.ch">UniDistance Suisse</a></div><div class="event_type"><a class="external" href="https://distanceuniversity.ch/academic-events/mathematics-colloquium/">Mathematics Colloquium </a></div><br /><div class="event_speaker"> Peter Feller (ETH Zürich)</div><div class="event_title"><a class="external" href="https://unidistance.ch/en/event/knots-moebius-bands-and-inscribed-rectangles">Knots, Möbius bands, and inscribed rectangles</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Does every Jordan curve in the Euclidean plane contain 4 points that form the corners of a square?Starting from this old metric problem posed by Toeplitz a hundred years ago, we discuss problems in low-dimensional topology.The talk will feature knots---embedded circles in 3-dimensional space---anddisks and Möbius bands knotted in 4-dimensional space.No prior knowledge of low-dimensional Topology will be assumed.<br><br>The link for participation in the event is the following: fernuni.zoom.us/j/64850280617.</div><div class="event_time">17:00 &bull; UniDistance Suisse, Zoom Seminar</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"><a class="external" href="https://sites.google.com/site/mathdanielatonon/">Prof. Dr. Daniela Tonon (Università degli Studi di Padova)</a></div><div class="event_title">Mean Field Games planning problems with general initial and final measures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The planning problem in Mean Field Games (MFG) was introduced by P.-L. Lions in his lessons, to describe models in which a central planner would like to steer a population to a predetermined final configuration while still allowing individuals to choose their own strategies. In a recent variational approach, see Graber, Mészáros, Silva and Tonon (2019) and Orrieri, Porretta and Savaré (2019) the authors studied the well-posedness of this problem in case of merely summable initial and final measures, using techniques, coming from optimal transport, introduced by Benamou and Brenier in 2000, extended to the congestion case in Carlier, Cardaliaguet and Nazaret (2013), and already used to show the existence and uniqueness of weak solutions for classical MFGs by Cardaliaguet and collaborators. The case of less regular initial and final measures is now studied via techniques introduced by Jimenez in 2008, for the analogous problem in optimal transport.</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 28      </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/forschung/mathematik/seminar-in-numerical-analysis">Seminar in Numerical Analysis</a></div><br /><div class="event_speaker"> Frédéric Nataf (CNRS — Université Pierre et Marie Curie)</div><div class="event_title">Adaptive Coarse Space for Saddle Point problem <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We introduce a scalable adaptive element-based domain decomposition (DD) method for solving saddle point problems defined as a block two by two matrix. The algorithm does not require any knowledge of the constrained space. We assume that all sub matrices are sparse and that the diagonal blocks are spectrally equivalent to a sum of positive semi definite matrices. The latter assumption enables the design of adaptive coarse space for DD methods that extends the GenEO theory to saddle point problems. Numerical results on three dimensional elasticity problems for steel-rubber structures discretized by a finite element with continuous pressure are shown for up to one billion degrees of freedom along with comparisons to Algebraic Multigrid Methods.</div><div class="event_time">11:00 &bull; Universität Basel, Spiegelgasse 5, SR 05.002</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">Prof. Dr. Michele Coti-Zelati  (Imperial College London)</div><div class="event_title">Diffusion and mixing for two-dimensional Hamiltonian flows <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We consider general two-dimensional autonomous velocity fields and prove that their mixing and dissipation features are limited to algebraic rates. As an application, we consider a standard cellular flow on a periodic box, and explore potential consequences for the long-time dynamics in the two-dimensional Euler equations. </div><div class="event_time">14:15 &bull; EPF Lausanne, Salle MA B2 485 </div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://stat.ethz.ch/events/zukost">ZüKoSt Zürcher Kolloquium über Statistik</a></div><br /><div class="event_speaker"> Benedikt  Herwerth (SwissRe)</div><div class="event_title">Avoiding indirect discrimination in modeling mortality <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The topic of potential discrimination in statistical and machine learning (ML) is being increasingly discussed, both by the scientific community and the wider public. In the insurance industry specifically, customers and regulators demand that individuals are treated fairly. Regulations of the European Union, for example, mandate that gender is not be used as a factor in determining the prices of policies.<br>This talk is based on a method introduced in a series of papers by Lindholm et al. on "discrimination-free insurance pricing" that address specifically the issue of potential indirect discrimination [1, 2, 3].<br>In the first part of the talk, we outline the solution by Lindholm et al., and we discuss that indirect discrimination is a topic that is subtle and can be difficult to understand for decision takers. In the second part of our talk, we present a Swiss Re internally built toolbox implementing the methodology. In the third part of our talk, we apply the methodology to model human mortality. We use public data of the German association of actuaries, which we interpret in terms of a Bayesian network describing the relation between age, gender, the smoker status and the mortality of individuals.<br>[1] M. Lindholm, R. Richman, A. Tsanakas and M. V. Wuthrich, "Discrimination-free insurance pricing," ASTIN Bulletin: The Journal of the IAA, vol. 52, pp. 55 - 89, 2022.<br>[2] M. Lindholm, R. Richman, A. Tsanakas and M. V. Wuthrich, "A Multi-Task Network Approach for Calculating Discrimination-Free Insurance Prices," 2 11 2022. [Online]. Available: https://ssrn.com/abstract=4155585.<br>[3] M. Lindholm, R. Richman, A. Tsanakas and M. V. Wuthrich, "A Discussion of Discrimination and Fairness in Insurance Pricing," 2 09 2022. [Online]. Available: https://ssrn.com/abstract=4207310.</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_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"> Bin Yu (UC Berkeley Statistics)</div><div class="event_title">Boolean interactions: practice and theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Thresholding or Boolean behaviors of biomolecules underlie many biological processes.Decision-trees capture such behaviors and tree-based methods such random forests have been shown to succeed in predictive tasks in genomics and medicine.<br>In this talk, we use UKBiobank data and a stable version of the random forests, iterative random forests (iRF), to recommend gene and gene-gene interactions that have data evidence for driving a heart disease, Hypertrophic Cardiomyopathy (HCM).4 out of the 5 recommendations are shown to be causal for HCM in follow-up gene-silencing experiments. This and other empirical successes of iRF motivate a theoretical investigation of its tractable version under a new local sparse and spiky (LSS) model where the regression function is a linear combination of Boolean interactions of features.The tractable version of iRF is shown to be model selection consistent under this new model with conditions of feature independence and non-overlapping interactions.</div><div class="event_time">15:15 &bull; EPF Lausanne, Salle  GA 3 21</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>';