var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-27"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-25"><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;">15.1 - 19.1.2024</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Winter Break 2023/24</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, January 15      </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">        Tuesday, January 16      </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">        Wednesday, January 17      </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/s/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker"> Damien Calaque (University of Montpellier)</div><div class="event_title">Shifted symplectic reduction</div><div class="event_time">10:30 &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_zh"><a class="external" href="https://ethz.ch">ETH Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/talks-in-mathematical-physics">Talks in Mathematical Physics</a></div><br /><div class="event_speaker"> Richard Rimanyi (UNC Chapel Hill and Newton Institute Cambridge)</div><div class="event_title">Characteristic classes of singular spaces and their \\hbar-deformations <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Suppose we have a singular subvariety in a smooth ambient space. The fundamental cohomology class represented by the subvariety is a key concept in various parts of geometry, from Schubert calculus to moduli spaces. The concept of fundamental class has a 1-parameter deformation (both in cohomology and in K theory) that measures even more geometric information. Remarkably, these 1-parameter deformations (called Chern-Schwartz-MacPherson class and Motivic Chern class) coincide with Okounkov’s stable envelope definition in the settings where both are defined. I will report on some consequences of his new relation between Singularity Theory and Geometric Representation Theory. </div><div class="event_time">16:30 &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">        Thursday, January 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/groupes-geometrie">Groupes et Géométrie </a></div><br /><div class="event_speaker"> Yves   Cornulier (Nantes)</div><div class="event_speaker"> Tullio  Ceccherini-Silberstein (Benevento)</div><div class="event_speaker"> Martin Bridson (Oxford)</div><div class="event_speaker"> Rostislav  Grigorchuk  (Texas A&M)</div><div class="event_speaker"> Gérard  Besson (Grenoble)</div><div class="event_title">Group Theory Day <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />09.00 – 09.50   Gérard Besson (Grenoble)<br>“A Finiteness Theorem for Gromov-hyperbolic groups”<br>Abstract :  We shall prove that given $H>0$ and $\\delta\\geq 0$ there is a finite number (up to isomorphisms) of marked groups $(\\Gamma , \\Sigma)$ which are$\\delta$-hyperbolic, torsion-free, non cyclic such that their entropy satisfies ${\\rm Entropy} (\\Gamma , \\Sigma) \\le H$. Here $\\Gamma$ is finitely generated and endowed with a (symmetric) finite generating set $\\Sigma$. The goal of the talk is to explain all the words in this abstract and give a flavour of the proof.<br><br>10.10 – 11.00   Rostislav Grigorchuk (Texas A&M)<br>“Multivariate  growth and cogrowth” <br><br>11.10 – 12.00  Martin Bridson (Oxford)<br>“The geometry of free-factor complexes, subgroups of Aut(F_N), and commensurations”<br><br>14.00 – 14.50  Yves Cornulier (Nantes)<br>“Finitely presented simple orderable groups, after Hyde and Lodha”<br><br> 15.10 – 16.00  Tullio Ceccherini-Silberstein (Benevento)<br>“First-order model theory, surjunctivity, and Kaplansky\'s stable finiteness conjecture”<br>Abstract: Using algebraic geometry methods, Xuan Kien Phung proved that the group ring of a surjunctive group with coefficients in a field is always stably finite.In other words, every group satisfying Gottschalk\'s conjecture also satisfies Kaplansky\'s stable finiteness conjecture.Based on a joint work with Michel Coornaert and Phung, I\'ll present a proof of this result based on first-order model theory. </div><div class="event_time">09:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, January 19      </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>';