var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-6"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-4"><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. 4</span>      <span style="float: right; text-align:right; width: 250px;">22.6 - 26.6.2026</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Summer Break 2026</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, June 22      </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/seminaire-danalyse-numerique">Séminaire d\'Analyse Numérique </a></div><br /><div class="event_speaker"> Mechthild  Thalhammer (Innsbruck)</div><div class="event_title">Community integration algorithms (CIAs): A novel computational approach for large-scale dynamical systems and extensions to networks <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The algorithm applied for the evaluation of the defining function constitutes a crucial factor in the numerical simulation of a large-scale dynamical system. This fundamental tool is essential for the significance of the obtained results and the overall performance. A novel modus operandi based on well-adapted global approximations and precomputations of reappearing quantities is proposed. It is demonstrated that this approach is expedient for a wide range of dynamical systems and permits substantial reductions from polynomial to linear computational complexity. Combining such concepts with state-of-the-art algorithms for the detection of communities in networks leads to community integration algorithms (CIAs) for dynamical systems on graphs. Numerical comparisons for relevant test problems with applications in various disciplines including higher-order Kuramoto–Daido-type systems arising in the description of synchronisation, Cucker–Smale systems exhibiting flocking behaviour, and extended systems on real world graphs for animal networks, confirm the robustness and efficiency of the novel computational approach.</div><div class="event_time">16:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, June 23      </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/seminaires-de-linstitut.html">Séminaire de Géométrie et Systèmes dynamiques </a></div><br /><div class="event_speaker"> Vinicius Ramos (IMPA Rio de Janeiro)</div><div class="event_title">Toric domains in disguise <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The study of symplectic embeddings has been a central topic insymplectic geometry since Gromov\'s 1985 nonsqueezing theorem. In thistalk, I will survey some of the history of symplectic embeddings andexplain how billiard dynamics sheds light into some very interestingembedding problems through the use of integrable systems. I will alsoexplain how the Toda lattice and its integrability is related tobilliard dynamics and some surprising connections to symplecticgeometry.</div><div class="event_time">11:00 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room 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://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"> Andres Hererro</div><div class="event_title">Moduli of non-pure sheaves, contractions and flops <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> I will explain how to contract subvarieties of a given smooth projective variety using certain non-standard moduli of sheaves. We will also see how to perform "wall-crossing" to obtain a birational transformation. This is used to prove instances of Kawamata\'s DK conjecture for derived categories.This talk is based on joint work with Svetlana Makarova.</div><div class="event_time">14:00 &bull; EPF Lausanne, CM 1 517</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/daco-seminar">DACO Seminar</a></div><br /><div class="event_speaker"> Chris Camaño (Caltech, USA)</div><div class="event_title">Efficient moment calculations for random tensor networks using Penrose diagrams <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />The statistical behavior of a random tensor is controlled by its moments. Unfortunately, these moments are notoriously challenging to describe analytically. In this talk, I will present the Penrose diagrammatic notation as a visual calculus that organizes these calculations into a series of diagrams. As an example, we will investigate the fourth-moment behavior of a particular random tensor called a random matrix product state (rMPS), also known as a random tensor train. Using a percolation argument, we will characterize the regime where an rMPS agrees with a standard Gaussian random tensor up to the first four moments. No prior background in tensors is assumed.Joint work with Joel A. Tropp, Ethan Epperly, and Raphael Meyer.</div><div class="event_time">15:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, June 24      </div>      <div class="day_content">        <div class="day_content_item no_event">        No events scheduled today!        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, June 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://sites.google.com/view/pm-seminar/home">Physical Mathematics Seminar</a></div><br /><div class="event_speaker"> Jie Gu</div><div class="event_title">BPS spectrum from resurgent topological string <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Perturbative series in topological string theory such as those of free energiesare divergent. Their complete description requires non-perturbative correctionswhich are related to the perturbative series by Stokes transformations. Wecalculate these non-perturbative corrections as well as the associated Stokesconstants using resurgence theory and extended holomorphic anomalyequations, based on which we observe and conjecture that the Stokesconstants coincide with the BPS invariants of the underlying type II superstring.We support our conjecture with evidence from models of compact CYs andlocal CYs where very non-trivial BPS invariants could be reproduced, as wellas examples of dual supersymmetric gauge theories, where sometimes theentire BPS spectrum could be generated by monodromy arguments. Wallcrossingof Stokes constants will also be mentioned.</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/sfs/news-and-events/data-science-seminar">ETH-FDS seminar </a></div><br /><div class="event_speaker"> David M. Blei (Columbia University)</div><div class="event_title">A Fresh Look at Empirical Bayes <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Empirical Bayes improves simultaneous inference by learning fromrelated data. In this talk, I will present three recent directions inempirical Bayes. First, I will discuss a general method based onprobabilistic symmetries, which extends empirical Bayes beyondexchangeable settings to structured problems such as arrays, graphs,conditional data, and spatial models. Second, I will discuss empiricalBayes for implicit likelihoods, where the model is available onlythrough a simulator, and show how simulation-based inference can beused to produce empirical Bayes estimates without evaluating adensity. Third, I will discuss an empirical Bayes approach tocombining randomized experiments and observational studies, wherecalibration studies make it possible to learn the distribution ofobservational bias and use observational data in a principled way.These three ideas illustrate new roles for empirical Bayes in modernstatistics and machine learning.This is joint work with Diana Cai, Don Green, Sebastian Salazar,Xinwei Shen, Sebastian Wagner-Carena, Eli Weinstein, Bohan Wu, ChengZhang.</div><div class="event_time">16:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room D 1.2</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://k-os.math.ethz.ch">[K-OS] Knot Online Seminar</a></div><br /><div class="event_speaker"> Michel Boileau (Aix–Marseille Université)</div><div class="event_title">A ribbon knot which is not a symmetric union</div><div class="event_time">16:15 &bull; <a class="external" href="https://ethz.zoom.us/j/62106645974">online</a></div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, June 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://stat.ethz.ch/events/zukost">ZueKoSt: Seminar on Applied Statistics</a></div><br /><div class="event_speaker"> Cancelled: Jo  Eidsvik (NTNU, Norway)</div><div class="event_title">Cancelled: Sequential spatio-temporal sampling designs for marine robots <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Cancelled: The advent of drones with computing units provides new opportunities and challenges for statistical sampling. Especially so in the ocean where remote communication and control is difficult. In this presentation, we focus on marine robots and in particular so-called autonomous underwater vehicles (AUV) that can be deployed for in-situ ocean sampling useful for surveying, monitoring or mapping purposes.  Equipped with a computer unit, an AUV can sense the ocean environment, update its onboard model based on data, plan where and when to navigate for efficient spatio-temporal sampling efforts, and act using its engines and navigation systems. We demonstrate methods for combining spatio-temporal statistical modeling and autonomous robotic systems for efficient experimental designs. Building on Gaussian random field models, we present an approach for real-time sequential AUV operation and planning. Depending on the goal of the operation, this adaptive sampling approach relies on fast computation of acquisition functions like maximum expected improvement, minimum expected Bernoulli variance or entropy which have closed-form solutions for the Gaussian model and hence enable real-time computation for efficient sampling. In several applications with ocean front mapping, mine tailings pollution monitoring and chlorophyll hotspot sampling, we develop, test and deploy algorithms for efficient AUV sampling. </div><div class="event_time">15:15 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</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>';