var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-74"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-72"><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. 8</span>      <span style="float: right; text-align:right; width: 250px;">6.11 - 10.11.2023</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 6      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker"> Tsviqa Lakrec (Institut für Mathematik, Universität Zürich)</div><div class="event_title">The Amplituhedron BCFW Triangulation <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">Yuval Yifrach (Technion)</div><div class="event_title">Non Algebraic Versions of the p-Adic Littlewood Conjecture and of Duke\'s Theorem for Subcollections <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p align="justify"> Various algebraic phenomenons in homogeneous dynamics have non algebraic counterparts. For example, the equidistribution of Hecke neighbors can be seen as a non-algebraic counterpart of Duke\'s Theorem. In this talk, we consider non-algebraic counterparts of the p-Adic Littlewood Conjecture and of Duke\'s Theorem for subcollections. &lt;BR> One of the non-algebraic counterparts of the p-Adic Littlewood Conjecture involves unboundedness of the A-orbits of arbitrary choices of p-Hecke neighbors of a lattice as p goes to infinity along the primes. &lt;BR> We prove, using expanders, a bootstrap argument and the equidistribution of Hecke neighbors, that the set of exceptions for this conjecture has Hausdorff dimension strictly smaller than 1 in [0,1] (where we assign lattices to points in [0,1]). Moreover, we discuss evidence for the conjecture in some cases using GRH. &lt;BR> &lt;BR> This talk is based on a joint ongoing work with Erez Nesharim from the Technion. &lt;/p></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_ne"><a class="external" href="https://unine.ch">Université de Neuchâtel</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">Prof. Dr. Emmanuel Opshtein (Université de Strasbourg)</div><div class="event_title"> Liouville polarizations and their Lagrangian skeleta in dimension 4   <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> In the simplest framework of a symplectic manifold with rational symplectic class, a symplectic polarization is a smooth symplectic hypersurface Poincaré-Dual to a multiple of the symplectic class. This notion was introduced by Biran, together with the isotropic skeleta associated to a polarization, and he exhibited symplectic rigidity properties of these skeleta. In later work, I generalized the notion of symplectic polarizations to any closed symplectic manifold, and showed that they are useful to construct symplectic embeddings. In the present talk, I will explain how this notion of polarization can be generalized further to the affine setting in dimension 4 and how it leads to more interesting embedding results. These refined embedding constructions provide a new way to understand the symplectic rigidities of Lagrangian skeleta noticed by Biran and get new ones. These results also lead to (seemingly new kind of) rigidities for some Legendrian submanifolds in contact geometry.  I will present several examples and applications. Work in progress, in collaboration with Felix Schlenk.</div><div class="event_time">15:00 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room B217</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, November 7      </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"> Jehanne Dousse (UNIGE)</div><div class="event_title">Companions to the Andrews-Gordon partition identities <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A partition of a positive integer n is a non-increasing sequence of positive integers, called parts, whose sum is n. A partition identity is a theorem stating that for all n, the number of partitions of n satisfying some conditions (often congruence conditions on the parts) equals the number of partitions of n satisfying some other conditions (often difference conditions between the parts). The Andrews-Gordon identities, which generalise the Rogers-Ramanujan identities, are among the most famous and widely studied partition identities. Using techniques from commutative algebra, Pooneh Afsharijoo conjectured in 2020 a companion to these identities (i.e. a partition identity with the same congruence conditions but other difference conditions). In this talk, we will explain the origins of this conjecture and show how it can be proved using Young diagrams, a graphical representation of integer partitions.This is joint work with Pooneh Afsharijoo, Frédéric Jouhet and Hussein Mourtada.</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://algebra.dmi.unibas.ch/seminar.html">Seminar Algebra and Geometry</a></div><br /><div class="event_speaker"> Aurore Boitrel (University of Angers)</div><div class="event_title">Automorphism groups of del Pezzo surfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Del Pezzo surfaces and their automorphism groups play a key role in the study of algebraic subgroups of the Cremona group of the plane.Over an algebraically closed field, it is classically known that a del Pezzo surface is either isomorphic to $\\mathbb{P}^{1} \\times \\mathbb{P}^{1}$ or to the blow-up of $\\mathbb{P}^{2}$ in at most $8$ points in general position, and in this case, automorphisms of del Pezzo surfaces are known and have been described. In particular, there is only one isomorphism class of del Pezzo surfaces of degree $5$ over a field $\\mathbf{k}=\\overline{\\mathbf{k}}$. In this talk, we will focus on del Pezzo surfaces of degree $5$ defined over a perfect field $\\mathbf{k}$. In this case, there are many more extra surfaces (as we can already see for rational real forms of del Pezzo surfaces of large degrees), and the classification as well as the description of the automorphism groups of these surfaces over $\\mathbf{k}$ is reduced to understanding the actions of the Galois group $\\operatorname{Gal}(\\overline{\\mathbf{k}}/\\mathbf{k})$ on the graph of $(-1)$-curves. </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_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"> Gabriele Bocchi (Tor Vergata)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-gabriele-bocchi-tor-vergata/">The optimal transport problem: equivalent formulations and regularizations</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/Gabriele_Bocchi.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://www.math.uzh.ch/mat770.1">Oberseminar: Algebraische Geometrie</a></div><br /><div class="event_speaker">Dr. Olivier Benoist (École Normale Supérieure)</div><div class="event_title">On the field of meromorphic functions on a Stein compact set <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will prove that the field of meromorphic functions on a Stein compact set of dimension n (for instance on the closed unit ball in C^n) has cohomological dimension n. The main tool is an extension to the Stein setting of Artin\'s theorem comparing étale and singular cohomology. I will give applications of these results to sums of squares problems in analytic geometry.</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_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"> Alapan Mukhopadhyay</div><div class="event_title">Title T.B.A.</div><div class="event_time">14:15 &bull; EPF Lausanne </div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://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">Tommaso Goldhirsch (ETHZ)</div><div class="event_title">What is... an isoperimetric inequality? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The isoperimetric problem is to find the figure in the plane having the greatest area among all those with the same perimeter. This problem and its apparently obvious solution, the circle, date back to at least Ancient Greece but for a rigorous proof we have to wait until the 19th century. We will overview the history of the isoperimetric inequality and sample some of its evolutions in recent times.\'\'</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"> Jérémy Blanc (UniBS)</div><div class="event_title">Quotients of Cremona groups <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 the Cremona group. For an algebraist, it is a Galois group, the one of the purely transcendental extension in n variables C(x_1,...,x_n)/C (one may change the field C). For a geometer, it is the group of birational transformations of affine or projective space of dimension n. I will consider a classical question asked by Enriques in 1895 and revived in 1987 in the Encyclopedia of Mathematics: are Cremona groups simple? For n=1, the answer is positive and classical, as the group is PGL_2(C)=PSL_2(C). In dimension n>1, the negative answer was given only in 2013 for n=2 and in 2021 for n>2. Once the group is known not to be simple, one may study its quotients. The difference between n=2 and n>2 then becomes much more significant.</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">Prof. Dr. Ricardo Mendes (University of Oklohama)</div><div class="event_title">Manifold submetries and their Invariant Theory</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 8      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://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"> Lucien Hennecart</div><div class="event_title">Mini course</div><div class="event_time">10:00 &bull; EPF Lausanne</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/forschung/mathematik/analysis/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker"> Gabriele Bocchi (Università degli Studi di Roma Tor Vergata)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-analysis-and-mathematical-physics-gabriele-bocchi-universita-degli-studi-di-roma-tor-vergata/">A mean field planning approach to regularizations of the optimal transport problem</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>We analyze an optimal transport problem with additional entropic cost evaluated along curves in the Wasserstein space which join two probability measures m_0 and m_1. The effect of the additional entropy functional results into an elliptic regularization for the (so-called) Kantorovich potentials of the dual problem.&lt;/p>&lt;p>Assuming the initial and terminal measures to have densities, we prove that the optimal curve remains positive and locally bounded in time. We focus on the case that the transport problem is set on a compact Riemannian manifold with Ricci curvature bounded below.&lt;/p>&lt;p>The approach follows ideas introduced by P.L. Lions in the theory of mean-field games about optimization problems with penalizing congestion terms. Crucial steps of our strategy include displacement convexity properties in the Eulerian approach and the analysis of distributional subsolutions to Hamilton-Jacobi equations.&lt;/p>&lt;p>The result provides a smooth approximation of Wasserstein-2 geodesics.&lt;/p></div><div class="event_time">14:15 &bull; Universität Basel, Spiegelgasse 5, Seminarraum 05.002</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_sg"><a class="external" href="https://www.unisg.ch">Universit&auml;t St. Gallen</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Prof. Dr. Edoardo Persichetti (Dakota State University)</div><div class="event_title">On Practical Post-Quantum Signatures from the Code Equivalence Problem <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The design of secure post-quantum digital signatures is a particularly important and current topic, especially considering the presence of initiatives such as NIST\'s call for proposals. While lattice-based designs offer intriguing solutions (some of which are about to be standardised) NIST itself expressed the desire for alternatives, based on different security assumptions. Code-based signatures are historically challenging to design, due to the intrinsic nature of the Hamming metric, and the syndrome decoding problem; however, a recent approach exploiting the notion of code equivalence offers an interesting alternative. In this talk, we briefly summarise the state of the art, introduce the LESS signature scheme, and then present recent developments which greatly contribute to making it one of the most promising code-based signature schemes in literature.</div><div class="event_time">15:00 &bull; Uni St. Gallen, 64-110</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_sg"><a class="external" href="https://www.unisg.ch">Universit&auml;t St. Gallen</a></div><div class="event_type"><a class="external" href="https://www.math.uzh.ch/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Giacomo Borin (Universität Zürich)</div><div class="event_title">Additional Functionalities for Code-Based Group Actions <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Group actions are fundamental mathematical tools, both for classical cryptography with discrete logarithm and for post-quantum cryptography, such as isogeny-based and code-based ones. They have received a lot of interest from the cryptographic community, who are also attracted by the possibility of defining additional functionalities over standard primitives. However, different families of group actions may differ significantly in their core characteristics, so some works usually focus on specific schemes, usually with abelian acting groups like CSI-FiSh. In this talk, we will see some additional functionalities for general cryptographic group actions, particularly the one arising from isomorphism problems in coding theory used in LESS and MEDS signature schemes, such as a threshold implementation and different commitment design strategies.</div><div class="event_time">16:15 &bull; Uni St. Gallen, 64-110</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. Erich Baur (Berner Fachhochschule, Technik und Informatik)</div><div class="event_title">Random walks with reinforced memory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We discuss various models of random walks with a reinforced memory originating from the well-known Elephant Random Walk. We concentrate on models with a linear reinforcement mechanism, where the weight of a step is increased by an additive factor if the step is remembered, making it therefore likelier to repeat the step again and again in the future. We will also discuss the counterbalanced versions of these walks.</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 9      </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"> Domenico Valloni</div><div class="event_title">Title T.B.A.</div><div class="event_time">14:15 &bull; EPF Lausanne</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Thomas Blomme (Genève)</div><div class="event_title">Gromov-Witten invariants of bielliptic surfaces <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Bielliptic surfaces were classified by Bagnera & de Francis more than a century ago. They form a family spread into seven subfamilies of the Kodaira-Enriques surface classification which have nearly trivial canonical class in the sense that it is non-zero, but torsion. Thus, the virtual dimension of the modulispace of curves only depends on the genus, and contrarily to abelian and K3 surfaces, it yields non-zero invariants. In this talk we\'ll focus on sometechniques to compute GW invariants of these surfaces along with some regularity properties.</div><div class="event_time">16:15 &bull; Université de Genève, salle 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">Dr. David Mitrouskas (IST Austria)</div><div class="event_title">The low-energy spectrum of the strongly coupled polaron <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The polaron model describes an electron interacting with a polarizable crystal which is modelled by a nonrelativistic continuous quantum field. If the interaction between the electron and the field is strong, it is known that the ground state energy is to leading order given by the ground state energy of the semiclassical polaron model, where the field is treated as a classical variable. In this talk, we give a detailed description of the full low-energy spectrum of the (confined) polaron by providing arbitrarily high corrections to the semiclassical energy. More precisely, we present an asymptotic series expansion for every low-energy eigenvalue in inverse powers of the coupling constant. Towards the end of the talk, we will discuss what is known about the low-energy spectrum of the non-confined translation-invariant polaron, in particular, the existence of excited bound states at fixed total momentum. The talk is based on joint works with M. Brooks, K. Mysliwy and R. Seiringer.</div><div class="event_time">16:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://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"> Ekaterina Eremenko (EEFilms und TU Berlin)</div><div class="event_title">Presentation and screening of the movie "Math circles around the world" <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Every week, hundreds of children in different cities of the worldmeet to solve complex problems. Find out who they are, why they do it and how in the film "Math circles around the world." The filmscreening will be followed by a discussion about mathematical circles.</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. Andrea Macrina (University College London)</div><div class="event_title">Arcade Processes for Informed Martingale Interpolation and Transport <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Arcade processes are a class of continuous stochastic processes that interpolate in a strong sense between zeros at fixed pre-specified times. Their additive randomization allows one to match any finite sequence of target random variables, indexed by the given fixed dates, on the whole probability space. The randomized arcade processes can thus be interpreted as a generalization of anticipative stochastic bridges. The filtrations generated by these processes are utilized to construct a class of martingales which interpolate between the given target random variables. These so-called filtered arcade martingales (FAMs) are almost-sure solutions to the martingale interpolation problem and reveal an underlying stochastic filtering structure. In the special case of conditionally Markov randomized arcade processes, the dynamics of FAMs are informed through Bayesian updating. FAMs can be connected to martingale optimal transport (MOT) by considering optimally coupled target random variables. Moreover, FAMs allow to formulate an information-based martingale optimal transport problem, which enables the introduction of noise in MOT, in a similar fashion to how Schrödinger\'s problem introduces noise in optimal transport. This information-based transport problem is concerned with selecting an optimal martingale coupling for the target random variables under the influence of the noise that is generated by an arcade process.</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://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. Miquel Oliu Barton (Université Paris Dauphine)</div><div class="event_title">Value positivity of matrix games <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Matrix games are the most basic problem in Game Theory, but robustness to small perturbations is not yet fully understood. A perturbed matrix game is one where the entries depend on a parameter which varies smoothly around zero. We introduce two new concepts: (a) value-positivity if, for every sufficiently small error, there is a strategy that guarantees the value of the error-free matrix game; and (b) uniformvalue-positivity if there exists a fixed strategy that guarantees, for every sufficiently small error, the value of the error-free matrix game. While the first concept captures the dependency of optimal strategies to small perturbations, the second naturally arises where the data is uncertain and a strategy is sought which remains optimal despite that uncertainty. In this paper, we provide explicit polynomial-time algorithms to solve these two problems for any polynomially perturbed matrix game. For (a), we further provide a functional form for the error-dependent optimal strategy. Last, we translate our results into robust solutions for LPs.</div><div class="event_time">18:15 &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, November 10      </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"> Larisa Beilina (University of Göteborg)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/seminar-in-numerical-analysis-larisa-beilina-university-of-goeteborg/">A posteriori error estimates and adaptive error control  for electromagnetic coefficient inverse problem in conductive media</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>An adaptive finite element/finite difference domain decomposition method for solution of time-dependent Maxwell\'s equations for electric field in conductive media will be presented. This method is applied for reconstruction of dielectric permittivity and conductivity functions using time-dependent scattered data of electric field at the boundary of the domain.&lt;/p>&lt;p>All reconstruction algorithms are based on optimization approach for finding of stationary point of the Lagrangian. Derivation of a posteriori error estimates for the regularized solution and Tikhonov functional will be presented.  Based on these estimates adaptive reconstruction algorithms are developed.  Computational tests will show robustness of proposed algorithms in 3D.&lt;/p>&lt;p> &lt;/p>&lt;p>For further information about the seminar, please visit this <a href="https://dmi.unibas.ch/de/forschung/mathematik/seminar-in-numerical-analysis/" title="Opens internal link in current window">webpage</a>.&lt;/p></div><div class="event_time">11:00 &bull; Universität Basel</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://unidistance.ch/en/mathematics-and-computer-science/event/swiss-number-theory-days-2024">Number Theory Days</a></div><br /><div class="event_title"><a class="external" href="https://numbertheory.dmi.unibas.ch/ntd2023/index.html">Number Theory Days 2023</a></div><div class="event_time">14:00 &bull; Universität Basel, HS-101, Alte Universität, Rheinsprung 9</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Saturday, November 11      </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://unidistance.ch/en/mathematics-and-computer-science/event/swiss-number-theory-days-2024">Number Theory Days</a></div><br /><div class="event_title"><a class="external" href="https://numbertheory.dmi.unibas.ch/ntd2023/index.html">Number Theory Days 2023</a></div><div class="event_time">14:00 &bull; Universität Basel, HS-101, Alte Universität, Rheinsprung 9</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>';