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. 5</span>      <span style="float: right; text-align:right; width: 250px;">22.1 - 26.1.2024</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 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/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Pedro Carvalho (IMPA,Rio)</div><div class="event_title">On homological reduction of Poisson structures <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Given a $\\mathfrak{g}$-action on a Poisson manifold $(M, \\pi)$ and anequivariant map $J: M \\rightarrow \\mathfrak{h}^*,$ for $\\mathfrak{h}$ a $\\mathfrak{g}$-module, we show how to obtain, under natural compatibility and regularity conditions previously considered by Cattaneo-Zambon, a homotopyPoisson algebra generalizing the classical BFV algebra described by Kostant-Sternberg in the usual hamiltonian setting. This is obtained from a BFV modelfor the hamiltonian reduction of the shifted cotangent bundle $T^*[1]M$ coupled with a compatible Poisson structure. As an application, we derive homological models for the reduced spaces associated to quasi-Poisson and hamiltonian quasi-Poisson spaces. In the end, we shall remark on how the general methods behind our construction can lead to a homological formulationof the reduction of Courant algebroids.</div><div class="event_time">15:30 &bull; Université de Genève, Conseil Général 7-9, Room 1-07</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, January 23      </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"> Philippe Chartier (Ravel Technologies, Paris)</div><div class="event_title">An introduction to fully homomorphic encryption <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 give a brief overview of fully homomorphic encryption (FHE) and present one of the most promising method, the so-called TFHE. I will in particular detail the central “bootstrapping” technique.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 1-05</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, January 24      </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/daco-seminar">DACO Seminar</a></div><br /><div class="event_speaker"><a class="external" href="http://www.iaa.tu-bs.de/timodewolff/">Prof. Dr. Timo de Wolff (TU Braunschweig )</a></div><div class="event_title">An Introduction to Nonnegativity and Polynomial Optimization <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In science and engineering, we regularly face (constrained) polynomial optimization problems (CPOP). That is the task to minimize a real, multivariate polynomial under polynomial con-straints. Solving these problems is essentially equivalent to certifying nonnegativity of real polyno-mials – a key problem in real algebraic geometry since the 19th century. Since this is a notoriously hard to solve problem (e.g., various NP-complete problems admit a CPOP formulation), one is interested in certi&#64257;cates that imply nonnegativity and are easier to check than nonnegativity itself. In particular, a polynomial is nonnegative if it is a sums of squares (SOS) of other polynomials. Being an SOS can be detected e&#64256;ectively via semide&#64257;nite programming (SDP) in practice.In 2014, Iliman and I introduced a new certi&#64257;cate of nonnegativity based on sums of nonneg-ative circuit polynomials (SONC), which I have developed further since then both in theory and practice joint with di&#64256;erent coauthors. In particular, these certi&#64257;cates are independent of sums of squares and can be computed via relative entropy programs.In this talk, I will give an introduction to polynomial optimization, nonnegativity, SOS, and SONC, and, if time permits, give an examples of applications of SONCs.</div><div class="event_time">10:30 &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, January 25      </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">        Friday, January 26      </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://www.epfl.ch/schools/sb/research/math/statistics-seminars/">Statistics Seminar </a></div><br /><div class="event_speaker"> Jacob Zavatone-Veth (Harvard)</div><div class="event_title">Towards a complete theory of representation learning and generalization in linear Bayesian neural networks <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Understanding how representation learning affects generalization is among the foremost goals of modern deep learning theory. In this talk, I will discuss the significant recent progress that has been made towards understanding perhaps the simplest toy model for deep representation learning: deep linear Bayesian neural networks. For these models, we can obtain a precise asymptotic characterization of generalization and representation learning, and in some cases even obtain closed-form solutions at finite size. I will conclude by commenting on remaining gaps in our understanding, and on transferrability of insights to nonlinear models. </div><div class="event_time">13:15 &bull; EPF Lausanne, GA 3 21</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>';