var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-5"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-3"><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. 3</span>      <span style="float: right; text-align:right; width: 250px;">17.6 - 21.6.2024</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Summer Break 2024</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, June 17      </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://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Euiwoong Lee</div><div class="event_title">Parameterized Approximability of F-Deletion Problems <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />For a family F of graphs, the F-Deletion Problem asks to remove the minimum number of vertices from a given graph G to ensure that G belongs to F. One of the most common ways to obtain an interesting family F is to fix another family H of graphs and let F be the set of graphs that do not contain any graph H as some notion of a subgraph, including (standard) subgraph, induced subgraph, and minor. This framework captures numerous basic graph problems, including Vertex Cover, Feedback Vertex Set, and Treewidth Deletion, and provides an interesting forum where ideas from approximation and parameterized algorithms influence each other. In this talk, I will give a brief survey on the state of the art on the F-Deletion Problems for the above three notions of subgraphs.</div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, June 18      </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"> Q.M.  Wargnier (Lockheed Martin Solar and Astrophysics Laboratory and Baeri)</div><div class="event_title">Advanced Time-Adaptive PIROCK Method with Error Control for Magnetic Reconnection Simulations in Chromospheric Environments <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Understanding the heating mechanism of the Sun\'s chromosphere remains a central challenge in solar physics, with magnetic reconnection (MR) playing a pivotal role in its heating and dynamics. Recent observations have highlighted the significance of ion-neutral interactions, which current models struggle to fully incorporate. In this presentation, we will introduce a numerical simulation with a Multi-Fluid Multi-Species (MFMS) model to investigate MR in upper chromospheric environments, accounting for multi-fluid/multi-species interactions, including helium and hydrogen species.The MFMS model is a multi-scale temporal model presenting challenges for temporal integration with classical integration methods. The model comprises stiff source terms from collisional or reactive effects, coupled with diffusion terms, and an increased number of equations due to the duplication for each fluid considered, complicating the time integration process. Therefore, our approach employs the second-order Partitioned Implicit-Explicit Runge-Kutta (PIROCK) method, renowned for its ability to handle complex convective-diffusive-reactive systems of equations like the MFMS model. Comparative analyses with alternative integration methods, including third-order explicit Runge-Kutta time integration and another method based on a first-order Lie splitting approach, underscore the superior computational efficiency and accuracy of PIROCK. Our findings underscore the vital role of particle decoupling in facilitating efficient heating mechanisms within the chromosphere, with implications for phenomena such as helium enrichment observed in switchbacks and coronal mass ejections.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, conference room, 8th floor (unusual room!)</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"> Nicolas  Ressayre  (Lyon)</div><div class="event_title">On the Belkale-Kumar cohomology of G/P <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Horn\'s conjecture provides an answer to the question: what can be said about the spectrum of the sum of two Hermitian matrices knowing the spectra of the summands? This problem concerns representations of the unitary group or the complex linear group. It can be generalised directly to any reductive group G.In 2006, Belkale and Kumar introduced a new product on the cohomology of projective homogeneous spaces and showed that it governs the geometry of the Horn problem for G.In this talk, we shall present the Belkale-Kumar product and discuss its connection with Horn. We will present one of the speaker\'s conjectures about it. Finally, we will explain two partial results on this conjecture, obtained independently, with Pierre-Emmanuel Chaput and Luca Francone. </div><div class="event_time">15:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, June 19      </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"> JP Serre</div><div class="event_title">Variation avec p du nombre de solutions mod p d\'une famille d\'équations polynomiales à coefficients entiers. <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br /> Résumé.  On verra comment cette question est liée à d\'autres concernant les représentations de groupes, et la cohomologie étale.</div><div class="event_time">14:15 &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"><a class="external" href="https://elalaoui.stat.cornell.edu/">Prof. Dr. Ahmed El Alaoui (Cornell, US)</a></div><div class="event_title">Bounding the covariance matrix of a spin system <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 address the question of bonding the operator norm of the covariance matrix of a disordered spin system. A first motivation stems from random matrix theory, where one would like to develop techniques for understanding matrices with subtle dependencies between the entries. A second motivation is about establishing functional inequalities and rapid mixing of Markov chains for these systems, where it has become recently apparent that bounding the norm of certain covariance matrices is a crucial step.     I will explain the above connections and present new results in the case of the Sherrington-Kirkpatrick model and the random field Ising model. I will then pose open problems and challenges arising when trying to extend these techniques to other settings of interest.Relevant readings:         https://arxiv.org/abs/2212.02445 (with Gaitonde)https://arxiv.org/abs/2311.06171 (with Eldan, Gheissari and Piana)https://arxiv.org/abs/2212.14476 (Brennecke, Schertzer, Xu, Yau)</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>    </div>    <div class="day">      <div class="day_title">        Thursday, June 20      </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"> Quentin Posva (Düsseldorf)</div><div class="event_title">On the singularities of 1-foliations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In positive characteristic geometry, purely inseparable morphisms can be described in terms of sheaves of tangent vectors called 1-foliations. They have been used by several authors to construct pathological examples, but so far only a few results pertaining to their singularities are available. In this talk, I will present two new results about the local theory of 1-foliations. The first one is the existence of resolutions, up to dimension three and in every positive characteristic. The second one is that the usual MMP notions of singularities, when adapted to 1-foliations, define a surprisingly restricted class of singularities.</div><div class="event_time">10:15 &bull; EPF Lausanne, GC D0 386</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, June 21      </div>      <div class="day_content">        <div class="day_content_item no_event">        No events scheduled today!        </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>';