var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-26"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-24"><img src="//www2.math.ethz.ch/smsjs/images/arrow_right.png"/></a></div>    <div class="sms_title">      <span style="float: left;">SMS</span>      <span>SWISS MATHEMATICAL SOCIETY</span>      <span style="float: right;">SMG</span>    </div>    <div class="sms_info">      <span style="float: left; width: 250px;">Bulletin no. 7</span>      <span style="float: right; text-align:right; width: 250px;">28.10 - 1.11.2024</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Autumn Semester 2024</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, October 28      </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"> Tom Mrowka (Massachusetts Institute of Technology)</div><div class="event_title">Floer homology of three manifolds and applications to low dimensional topology <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Floer homology and the related invariants of 4-manifolds has given us deep insight in smooth differential topology in dimensions 3 and particularly 4. The theory has yielded insights like existence of exotic differentiable structures on 4 dimensional euclidean space, complex curves minimize genus in complex projective space, killing the Hauptvermuntung, there even appear to be connection to the 4 color map theorem. This course will build up Floer homology of three manifolds from scratch. The focus will be on Instanton Floer homology but we will mention other versions and develop applications as the course goes on.</div><div class="event_time">10:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://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"> Piero Grassi (Università del Piemonte Orientale)</div><div class="event_title">Quantum Field Theories on Supermanifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We illustrate the construction of quantum field theories on supermanifolds and we provide a complete Cartan-calculus to deal with superdiffeomorphisms in curved space. We will briefly review the geometry of supermanifolds and we discuss the challenges related toquantum field theory applications. </div><div class="event_time">13:30 &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://math.ethz.ch/s/symplectic-geometry-seminar">Symplectic Geometry Seminar</a></div><br /><div class="event_speaker"> Adi Dickstein (Tel-Aviv University)</div><div class="event_title">Symplectic topology and ideal-valued measures  <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> In various areas of mathematics there exist "big fiber theorems", these are theorems of the following type: "For any map in a certain class, there exists a \'big\' fiber", where the class of maps and the notion of size changes from case to case.We will discuss three examples of such theorems, coming from combinatorics, topology and symplectic topology from a unified viewpoint provided by Gromov\'s notion of ideal-valued measures.We adapt the latter notion to the realm of symplectic topology, using an enhancement of Varolgunes’ relative symplectic cohomology to include cohomology of pairs. This allows us to prove symplectic analogues for the first two theorems, yielding new symplectic rigidity results.Necessary preliminaries will be explained.The talk is based on a joint work with Yaniv Ganor, Leonid Polterovich and Frol Zapolsky.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Cristina Caraci (Geneva)</div><div class="event_title">The Ground State Energy of Dilute Bose Gases <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 present recent developments in the application of rigorous Bogoliubov theory to Bose gases confined to a 3D unit torus in the Gross-Pitaevskii regime. I will prove that the ground state energy can be determined with an error term that vanishes faster than (log N)/N, as N tends to infinity, with N number of particles. This result aligns with Wu\'s predictions from the 1950s in the physics literature. Based on joint work with Alessandro Olgiati, Diane Saint Aubin and Benjamin Schlein.</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, October 29      </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"> Gigliola Staffilani (Massachusetts Institute of Technology)</div><div class="event_title">Dispersive equations and wave turbulence theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In this course we will investigate questions of weak turbulence theory by using as explicit example of wave interactions the solutions to periodic and nonlinear Schrödinger equations. We will start with Strichartz estimates on periodic setting, then we will move to well-posedness.We will then present two different ways of introducing the evolution of the energy spectrum. We will first work on a method proposed by Bourgain and involving the growth of high Sobolev norms. Then, we will give some ideas of how to derive rigorously the effective dynamics of the energy spectrum itself (wave kinetic equation), when one considers weakly nonlinear dispersive equations.</div><div class="event_time">10:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/annonces/groupes-geometrie">Groupes et Géométrie </a></div><br /><div class="event_speaker"> Ariel Yadin (Ben Gurion University of the Negev)</div><div class="event_title">Big subsets in small groups <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />There are many different ways groups can be considered "big" or "small".  Similarly this can be said about subsets in groups.  The simplest example of a big subset in an (amenable) group is a subset that has full density.  It is immediate that for any subset of full density, its complement has 0 density.  Moreover, one cannot find two disjoint subsets of density greater than a half each.In ongoing joint work with G. Salomon and Y. Svoray, we consider a different notion of big subsets, which is called completely syndetic (CS).  It is known that in non-virtually-nilpotent groups there is "enough room" to fit two disjoint CS subsets.  We prove that in virtually-Abelian groups this is not possible: the intersection of any two CS subsets is again a CS subset.  Moreover, we show that it is possible to find CS subsets of arbitrarily small density.The question of what happens in nilpotent but non-Abelian groups is still open.I will explain all the notions above during the talk, as well as the connection to ideals in the Stone-Cech compactification.  No prior knowledge is required.</div><div class="event_time">10:30 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ba"><a class="external" href="https://unibas.ch">Universität Basel</a></div><div class="event_type"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Marco Inversi (Basel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-marco-inversi-basel/">Bernoulli vs Euler, hypersurfaces and other amenities</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />abstract</div><div class="event_time">12:15 &bull; Universität Basel, Seminarraum 00.003, Spiegelgasse 1</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"> Philippe  Marchner (Université de Grenoble)</div><div class="event_title">Non-overlapping optimized Schwarz method for large scale time-harmonic flow acoustics problems <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The numerical resolution of time-harmonic flow acoustic problems at high frequencies is an important tool for noise prediction of aeroengines. However, the upper frequency limit that can be computed is dictated by the available computer memory, which represents a significant bottleneck. In this talk, I will present a substructured optimized Schwarz method for exterior time-harmonic problems governed by the Pierce aeroacoustic operator. Based on developments on non-reflecting boundary conditions, I will discuss the design of efficient transmission operators that account for strong mean flow convection and spatially varying medium properties, in order to accelerate the convergence of the iterative solver. Finally, I will show the application of the method to large-scale three-dimensional problems in a distributed memory setting, highlighting the challenges and potential future improvements.</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 cancelled"><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"> Lenpeng Ji (University of Leeds)</div><div class="event_title">CANCELLED: Bayesian CART models for aggregate claim modeling <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 discuss three types of Bayesian CART (or BCART) models for aggregate claim amount, namely, frequency-severity models, sequential models and joint models. We first introduce a general framework for the BCART models applicable to data with multivariate responses, which is particularly useful for the joint BCART models with a bivariate response: the number of claims and aggregate claim amount. To facilitate frequency-severity modeling, we investigate BCART models for the right-skewed and heavy-tailed claim severity data by using various distributions. We discover that the Weibull distribution is superior to gamma and lognormal distributions, due to its ability to capture different tail characteristics in tree models. Additionally, we find that sequential BCART models and joint BCART models, which incorporate dependence between the number of claims and average severity, are beneficial and thus preferable to the frequency-severity BCART models in which independence is assumed. The effectiveness of these models\' performance is illustrated by carefully designed simulations and real insurance data.</div><div class="event_time">14:00 &bull; EPF Lausanne, Extranef 125</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/daco-seminar">DACO Seminar</a></div><br /><div class="event_speaker"> Lucas Pesenti (Bocconi University, IT)</div><div class="event_title">Understanding iterative algorithms with Fourier diagrams <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We study a broad class of nonlinear iterative algorithms applied to random matrices, including power iteration, belief propagation, approximate message passing, and various forms of gradient descent. We show that the behavior of these algorithms can be analyzed by expanding their iterates in an appropriate basis of polynomials, which we call the Fourier diagram basis. As the dimension of the input grows, this basis simplifies to the tree-shaped diagrams, that form a family of asymptotically independent Gaussian vectors. Moreover, the dynamics of the iteration restricted to the tree diagrams exhibit properties reminiscent of the assumptions of the cavity method from statistical physics. This enables us to "implement" heuristic cavity-based reasoning into rigorous arguments, including a new simple proof of the state evolution formula. Based on joint work with Chris Jones (https://arxiv.org/abs/2404.07881)</div><div class="event_time">14:15 &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_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"> Adi  Dickstein (Tel Aviv University)</div><div class="event_title">Symplectic versus topological quasi-states <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> Topological quasi-states are special functionals on the algebra of continuous functions which are linear on single-generated subalgebras. They trace their origins to the von Neumann axioms of quantum mechanics. On symplectic surfaces, every topological quasi-state is symplectic, i.e., linear on Poisson-commutative subalgebras. We discuss the failure of this phenomenon in higher dimensions based on the study of symplectic embeddings of polydiscs. Furthermore, we introduce a Wasserstein-type metric on quasi-states and use it for quantitative constraints on symplectic quasistates. The talk is based on a joint work with Frol Zapolsky.</div><div class="event_time">14:30 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room A017</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"> Vladimir  Rubtsov (LAREMA, UMR 6093 CNRS-Université d’Angers))</div><div class="event_title">Kontsevich and Buchstaber polynomials, multiplication kernels, and beyond <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We discuss several partial results of ongoing work in collaboration (with I. Gaiur & D. Van Straten and with V. Buchstaber & I. Gaiur) on interesting properties of multiplication kernels, which include the famous Sonine –Gegenbauer formulas, examples of polynomials for Kontsevich discriminant locus given as addition laws for special 2-valued  formal groups (Buchstaber–Novikov–Veselov) as well as a connection with generalized Kowalevska integrable systems. If I have time, I shall try to describe a link between the multiplication kernels and a (kind of) Sklyanin Separation of Variables using our old construction with B. Enriquez.</div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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. Laura Prat</div><div class="event_title">Removable singularities for solutions of the Heat equation and the fractional Heat equation in time varying domains <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The talk will be about removable singularities for solutions of the Heat Equation and the Fractional Heat Equation in time varying domains. In order to talk about removability, some associated capacities will be introduced to study its metric and geometric properties. I will discuss onsome results obtained in joint work with X. Tolsa and J. Mateu and also mention some recent achievements with J. Hernández.</div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://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">Beatrice Toesca di Castellazzo (Institut für Mathematik, Universität Zürich)</div><div class="event_title">What is... Network Coding? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Suppose you want to send a message to your friend. Can errors occur during the transmission? Unfortunately yes. It is then crucial to find ways to detect errors in the received message and possibly correct it. The goal of algebraic coding theory is to design ways of encoding messages (vectors over a finite field) with an algebraic structure that guarantees that, with a limited number of errors, the meaning of the original message is not compromised. In multi-cast communication, as in the streaming of data over the Internet, one deals with sending information to multiple receivers across a network with several intermediate nodes. To improve the network throughput, a coding technique called random linear network coding was developed. In this scenario, the intermediate nodes transmit a random linear combination of the vectors received. With this technique, it is possible to asymptotically achieve the maximum capacity of the network, without relying on its topology. In this talk, we will start studying the basic notions of coding theory with only one sender and one receiver, and then switch to the case of data transmission over a network and explain how in this case giving the messages the structure of a linear subspace helps correcting errors.</div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_ne"><a class="external" href="https://unine.ch">Université de Neuchâtel</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=symplectic ">Geneva Neuchatel Symplectic Geometry Seminar (GeNeSyS)</a></div><br /><div class="event_speaker"> Vladimir Fock (Université de Strasbourg)</div><div class="event_title">TBK-symplectic structures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A K-symplectic structure on an (algebraic) manifold X is a section of a certain quotient sheaf on X. The Steinberg symbol is a map of this sheaf to an Abelian group. A certain Steinberg symbol gives a symplectic structure on X. Such structures do not exist for every symplectic manifold, but once it exists (and  it exists for cluster varieties)  one can say much more about this manifold. In particular it gives a pre-quantum line bundle, computes  hyperbolic volumes, and in addition gives certain invariants for  manifolds over number fields as well as central extensions of  simple and affine Lie groups.</div><div class="event_time">16:30 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room A017</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, October 30      </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://www.math.uzh.ch/mat760">Ergodic theory and dynamical systems seminar</a></div><br /><div class="event_speaker">Prof. Dr. François Maucourant (Université Rennes I)</div><div class="event_title">Discriminants of periodic geodesics on the modular surface <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We&#039;ll recall how to attach to a periodic geodesic of H^2/PSL(2,Z) an arithmetical quantity, its discriminant. After discussing how to pick a geodesic at random, we will show that &#039;most&#039; geodesics have large discriminant when ordered by length, and that 42% of them have a fundamental discriminant.</div><div class="event_time">13:30 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room H 28</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker"> Lycka Drakengren (ETH Zürich)</div><div class="event_title">Complex abelian varieties and their moduli VI <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The Torelli morphism and its extension to the moduli space of stable curves</div><div class="event_time">13:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_la"><a class="external" href="https://www.epfl.ch">EPF Lausanne</a></div><div class="event_type"><a class="external" href="https://www.epfl.ch/labs/hessbellwald-lab/seminar/epfl-topology-seminar-fall-2024/">Séminaire de Topologie </a></div><br /><div class="event_speaker"> Jerome Scherer (EPFL)</div><div class="event_title">Module spaces over homology theories and completion towers <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This is joint work with W. Chacholski and W. Pitsch. To any coaugmented functor X=>EX one can associate its "modules", i.e. spaces X which are retracts of EX. When E is ordinary homology, this functor is the infinite symmetric product and modules are generalized Eilenberg-Mac Lane spaces (GEMs). Given two such functors E and F  we introduce a new one, we denote by a bracket [E, F], as a pullback of two natural transformations E=>EF and F=>EF. We study modules over such brackets and construct two towers by bracketing systematically either on the left or the right. For ordinary homology we obtain two well-known towers: the Bousfield-Kan completion tower and the modified one as introduced by Dror Farjoun.</div><div class="event_time">14:00 &bull; <a class="external" href="https://plan.epfl.ch/?room==CM%201%20517">EPF Lausanne</a></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. Jean Bertoin (Universität Zürich, Switzerland)</div><div class="event_title">Graduate Workshop Reinforcement</div><div class="event_time">17:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room  H26</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, October 31      </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/zahlentheorie/">Seminar Zahlentheorie</a></div><br /><div class="event_speaker"> Alina Ostafe (University of New South Wales)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/number-theory-seminar-alina-ostafe-university-of-new-south-wales/">Title T.B.A.</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Title: On the frequency of primes preserving dynamical irreducibility of polynomials Abstract: In this talk we address an open question in arithmetic dynamics regarding the frequency of primes modulo which all the iterates of an integer polynomial remain irreducible. More precisely, for a class of integer polynomials $f$, which in particular includes all quadratic polynomials, we show that, under some natural conditions, the set of primes $p$ such that all iterates of $f$ are irreducible modulo $p$ is of relative density zero. Our results rely on a combination of analytic (Selberg\'s sieve) and Diophantine (finiteness of solutions to certain hyperelliptic equations) tools, which we will briefly describe. Joint wok with Laszlo Mérai and Igor Shparlinski (2021, 2024). Spiegelgasse 5, Seminarraum 05.002</div><div class="event_time">14:15 &bull; Universität Basel</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://sites.google.com/view/pm-seminar/home">Physical Mathematics Seminar</a></div><br /><div class="event_speaker"> Andrés Collinucci (Brussels University)</div><div class="event_title">GV invariants in non-toric local CY threefolds, some of which do not have compact curves. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Local Calabi-Yau singularities are a playground for counting BPS states, and indeed, for toric varieties, the techniques such as the topological vertex, for computing Gopakumar-Vafa invariants are very powerful.There is, however, an interesting class of *non-toric* CY local threefolds, of which  the conifold is a special case, that are constructed as ALE fibrations over the complex plane. They are known as higher-length flops. For those cases, my collaborators and I have stumbled upon a new duality frame that allowed us to compute GV invariants independently of previously known methods.In this talk, I will explain the concept of “simultaneous partial resolutions”, which is a group-theoretic way of building such threefolds.I will then show, that M-theory on such geometries can be dualized to IIA with intersecting D6-branes, where the GV invariants translate to elementary open string Ext^1 computations.Finally, I will present some results for CY threefolds that do not admit crepant resolutions. In this case, we are essentially giving a new definition of GV invariants for threefolds that do not have compact curves.</div><div class="event_time">16:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_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"> Shenghao Hua (Lausanne)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-shenghao-hua-lausanne/">Extreme Central L-values of Almost Prime Quadratic Twists of Elliptic Curves</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />abstract Afterwards, we invite the audience to a common tea. If you want to join, please sign in here until 29th of October.</div><div class="event_time">16:15 &bull; Universität Basel, Seminarraum 00.003, Spiegelgasse 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://www.math.uzh.ch/mat675.1">PDE and Mathematical Physics</a></div><br /><div class="event_speaker">Joscha Henheik (IST Austria)</div><div class="event_title">Universalities in BCS theory <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In nature one finds superconductors of varying critical temperatures and energy gaps. For weak superconductors, where the critical temperature is small, a universal phenomenon occurs: The ratio of the energy gap and critical temperature is a universal value, independent of the specific superconductor. I will present recent work on such universal phenomena in the BCS theory of superconductivity. Based on joint works with A. B. Lauritsen and B. Roos.</div><div class="event_time">16:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room F 26.1</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, November 1      </div>      <div class="day_content">        <div class="day_content_item normal"><div class="event_location uni_ge"><a class="external" href="https://unige.ch">Université de Genève</a></div><div class="event_type"><a class="external" href="https://www.unige.ch/math/tggroup/doku.php?id=fables">Séminaire "Fables Géométriques" </a></div><br /><div class="event_speaker"> Vladimir Fock (Strasbourg)</div><div class="event_title">mini-course: Goncharov-Kenyon integrable systems and plane curves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Goncharov-Kenyon constructed integrable system starting form any Newton polygon which generalize plenty of known integrable systems. The phase space of such system is the space of plane curves provided with a line bundle. On the other hand the same space admit a description as a cluster variety and thus can be parameterized by algebraic tori. The aim of the talk is to describe these two points of view on the integrable system as well as discuss some other geometric interpretations of them. </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_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/number-theory-seminar">Number Theory Seminar</a></div><br /><div class="event_speaker"> Tim Gehrunger (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Classification of genus 2 curves in residue characteristic 2</div><div class="event_time">14:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/algebraic-geometry-and-moduli-seminar">Algebraic Geometry and Moduli Seminar</a></div><br /><div class="event_speaker">Prof. Dr. Peter Patzt (Univ. of Oklahoma)</div><div class="event_title">Unstable cohomology of SL(n,Z) and Hopf algebras <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I want to give a survey about the rational cohomology of SL_n Z. This includes recent developments of finding Hopf algebras in the direct sum of all cohomology groups of SL_n Z for all n. I will give a quick overview about Hopf algebras and what this structure implies for the cohomology of SL_n Z. If time permits, I will explain a connection to graph homology.</div><div class="event_time">16:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 43</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>';