var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=0"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=2"><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. 2</span>      <span style="float: right; text-align:right; width: 250px;">21.9 - 25.9.2026</span>      <span style="text-align: center; display: block; width: 250px; margin: auto; position: relative;">Autumn Semester 2026</span>    </div>  </div>  <div></div>  <div id="sms_content">    <div class="day">      <div class="day_title">        Monday, September 21      </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/studium/mathematik/doktorat/bernoullis-tafelrunde">Bernoullis Tafelrunde</a></div><br /><div class="event_speaker"> Léo Mousseau (Université de Neuchâtel)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-leo-mousseau/">The L-space conjecture: geometry, topology and order of 3-dimensional spaces</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Abstract This talk is about a conjecture concerning 3-manifolds, i.e. spaces that are locally modelled on R³ . It predicts the equivalence of three properties: one geometric, one topological, and one group-theoretic. We will first introduce these three properties and then try to gain some intuition by looking at a few examples.</div><div class="event_time">12:15 &bull; Universität Basel, Seminarraum 05.002, Spiegelgasse 5</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"> Ibrahim Trifa (ETHZ)</div><div class="event_title">A multidimensional Birkhoff Theorem for some $C^0$ Lagrangians <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In 1922, Birkhoff proved that an essential embedded closed curve that is invariant under a symplectic twist map of the cylinder is a Lipschitz graph over the zero section. There has been several works extending this theorem in higher dimension (Herman, Katznelson–Ornstein, Siburg, Bialy–Polterovich...). In 2010, Arnaud proved that a closed exact Lagrangian in the cotangent bundle of a closed manifold that is invariant under the flow of a Tonelli Hamiltonian is a graph over the base. Some improvements on this theorem have been made on one hand by Bernard-dos Santos and Amorim-Oh-dos Santos, who showed a version of this theorem for Lipschitz Lagrangian submanifolds, and on the other hand by Charfi who replaced the invariance assumption with a recurrence assumption (for a topology he defined and called "reduced complexity convergence"). In this talk, I will explain how to define a new class of "$C^0$ Lagrangians" for which the multidimensional Birkhoff theorem holds, using a new variant of the reduced complexity convergence topology. In particular, this class contains all images of continuous graphs by $C^1$ exact symplectomorphisms, which can be less regular than Lipschitz.This is based on a work in progress with Skander Charfi.</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>    </div>    <div class="day">      <div class="day_title">        Tuesday, September 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"> Hans Johansen</div><div class="event_title">Implications of Discretization Choices for Mixed-Precision, Parallel-in-Time Methods for PDE’s <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 argue that numerical PDE codes need to evolve a new flexibility, that includes careful tradeoffs between spatial and temporal discretizations in mixed precisions. This is important because modern CPU and GPU hardware is increasingly evolving multi-precision capabilities, where precision is aggressively controlled to improve memory bandwidth and throughput for machine learning algorithms. Ominously, newer generations of chips are emulating double precision operations, so that scientific codes that rely on these will miss out on the 100x+ speedups being promised. We will present a structured analysis of a mixed-precision algorithm for cut-cell finite volume methods for PDEs, which combines regular grid operations with boundary discretizations that can be arbitrarily high order. We’ll show that naive conversion to lower precision, as is often done in linear algebra libraries, introduces low-frequency errors and effectively solves the wrong problem. Fixing this requires knowledge of the PDEs and a discrete optimization problem to recover the correct behavior. I demonstrate that this is particularly important for multi-resolution algorithms, such as adaptive mesh refinement (AMR), multigrid solvers, and parallel-in-time (PinT) methods. Several examples will show that codes can be adapted, but not blindly and without knowledge of the underlying PDEs and discretizations. This is joint work with Tallula Johansen (M.Eng. King’s College, London), who just graduated with first-class honors.</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_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"> Johannes Hauber (Jussieu, Paris)</div><div class="event_title">Can the superpotential of a torus detect a degeneration in its complement? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We will first explain Vianna\'s mechanism for distinguishing his monotone Lagrangian tori (T_{(a,b,c)} \\subset \\mathbb{CP}^2) from a new perspective.Then, we will investigate the following question. Suppose that (L_{p,q}) is a Lagrangian pinwheel contained in$\\mathbb{CP}^2 \\setminus T_{(a,b,c)}$. Is it true that $p \\in {a,b,c}$?We will describe an approach to this question combining superpotentials with neck stretching. The motivation is an intersection problem for singular Lagrangians which does not seem to be directly accessible by the usual Floer-theoretic methods.This is ongoing work with Nikolas Adaloglou and Andrea Piccirilli.</div><div class="event_time">14:30 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room B217</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_dis"><a class="external" href="https://unidistance.ch">UniDistance Suisse</a></div><div class="event_type"><a class="external" href="https://unidistance.ch/en/mathematiques-et-informatique/recherche/number-theory/number-theory-seminar">Number Theory Seminar</a></div><br /><div class="event_speaker"> Lambert  A\'Campo  (IHES)</div><div class="event_title">Local-global compatibility at l=p for automorphic Galois representations over CM fields <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />In joint work with Hevesi, Thorne and Whitmore we prove that the Galois representations associated with cohomological cuspidal automorphic representations over CM fields are potentially semi-stable and compatible with the local Langlands correspondence, up to semisimplification. The novelty of our work is that we make no assumptions on residual Galois representation. Our method relies on a bound on the torsion in the cohomology of certain Shimura varieties, which can be seen as a generalisation of the Caraiani-Scholze vanishing theorem. </div><div class="event_time">15:00 &bull; <a class="external" href="https://tinyurl.com/UniDistanceNTSeminar">UniDistance Suisse, Zoom</a></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. Noah Stevenson (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Title T.B.A.</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/seminaires/lie-sem/">Lie groups and moduli spaces </a></div><br /><div class="event_speaker"> Allen  Knutson  (Cornell)</div><div class="event_title">The mathematics of juggling, old and new <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I\'ll explain how to associate a juggling pattern to a matrix (and in the process, give a mathematical definition of juggling pattern, familiar to jugglers since the mid-\'80s). This defines the "positroid" stratification of the space of k x n matrices, with many great geometric features (e.g. the strata are smooth and their closures are normal). Much of this has been understood since 2013 down on the Grassmannian (matrices up to row operations) but there are new features when working upstairs on matrices. The 2013 work is joint with Thomas Lam and David Speyer, the new with Paul Zinn-Justin.</div><div class="event_time">15:30 &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://uzh.ch">Universit&auml;t Z&uuml;rich</a></div><div class="event_type"><a class="external" href="https://math.ethz.ch/s/zurich-colloquium-in-mathematics">Zurich Colloquium in Mathematics</a></div><br /><div class="event_speaker"> Gabriella Tarantello (University Rom Tor Vergata)</div><div class="event_title">On CMC 1-immersions of a closed surface into hyperbolic 3-manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Constant Mean Curvature (CMC) c-immersions of a closed orientable surface S(with genus g &#8805; 2) into hyperbolic 3-manifolds emerged by the work of K. Uhlenbeck in connection with irreducible representations of the fundamental group of S into the Mobious group. For |c| &lt; 1,  such (CMC) c-immersions are always available and labelled by elements of   the tangent bundle of the Teichmueller space of S.On the other hand, the (critical) value |c|=1 of the mean curvature plays a crucial role, since  (CMC) 1-immersions into the hyperbolic space H^3 (known as Bryant surfaces) furnish the hyperbolic analogue (via bi-holomorphisms)  of the classical minimal immersions into the Euclidean 3-space E^3.Naturally, one could try to attain (CMC) 1-immersions as limits for |c| &#8594; 1. But possible “blow-up” phenomena could yield (after scaling) to  (CMC) 1-immersions with conical singularities, consistently with the presence of smooth ends in Bryant surfaces. I shall discuss how to encompass the blow-up situation interms of  suitable “orthogonality conditions” involving the image Z of the Kodaira map (for genus g = 2) and more generally the (g &#8722;1)-secant variety of Z, for larger genus. Subsequently, using Hitchin self-duality theory, I shall indicate how the given  “orthogonality conditions” are actually sharp towards  “compactness”.In this way, under a generic condition, we can ensure existence and uniqueness of (CMC) 1-immersions of S into (germs) of hyperbolic 3-manifolds, and obtain aparametrization of the corresponding moduli space in terms of the tangent bundle of the Teichmueller space of S.</div><div class="event_time">16:30 &bull; UZH Zentrum, Building KO2, Room F 150</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Wednesday, September 23      </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">Dr. Yuriy Tumarkin (CY Cergy Paris Université)</div><div class="event_title">Invariant sets in the wind-tree model</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_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"> Allen  Knutson  (Cornell University)</div><div class="event_title">The mathematics of juggling, old and new <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I\'ll explain how to associate a juggling pattern to a matrix (and in the process, give a mathematical definition of juggling pattern, familiar to jugglers since the mid-\'80s). This defines the "positroid" stratification of the space of k x n matrices, with many great geometric features (e.g. the strata are smooth and their closures are normal). Much of this has been understood since 2013 downon the Grassmannian (matrices up to row operations) but there are new features when working upstairs on matrices. The 2013 work is joint with Thomas Lam and David Speyer, the new with Paul Zinn-Justin. </div><div class="event_time">14:15 &bull; EPF Lausanne, GR A3 32</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/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Julia Elena Würsch</div><div class="event_title">An Analysis of the Number of Reduction Steps for Special Two-Dimensional Lattices <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>&lt;span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: #000000;" data-olk-copy-source="MessageBody">This talk analyzes the reduction-step behavior of the Gaussian lattice-reduction algorithm on lattices arising from ideals in imaginary quadratic fields, which appear in isogeny-based cryptography. We focus on the probability that the algorithm requires more than a fixed number of reduction steps and model how these lattices are distributed geometrically. Using these geometric insights, we propose a line-intersection model that predicts the distribution of number of reduction steps and compare it with experimental data.&lt;/span>&lt;/p></div><div class="event_time">15:15 &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/geometry-seminar">Geometry Seminar</a></div><br /><div class="event_speaker"> Segev Gonen Cohen (ETH Z&uuml;rich, Switzerland)</div><div class="event_title">Actions of lattices on manifolds <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 describe recent progress on the Zimmer Programme, the study of actions of lattices in Lie groups on manifolds by diffeomorphisms. We begin by recalling motivations and some important examples, explain the general strategy introduced by Brown-Fisher-Hurtado when the manifold is of low enough dimension, and discuss modifications that allow us to prove results in more general semisimple and S-arithmetic groups. Time willing, we will also describe some recent progress on actions of dense subgroups of Lie groups on manifolds.</div><div class="event_time">15:30 &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/sam/news-and-events/zhacm-colloquia">Zurich Colloquium in Applied and Computational Mathematics</a></div><br /><div class="event_speaker">Prof. Dr. Ivan Dokmani&#263; (Universität Basel, Switzerland)</div><div class="event_title">On learning operators with pullbacks and pushforwards <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />This talk discusses the theory and practice of operator learning, motivated by inverse problems and PDE solution maps. We start with function graph transformers which represent functions by measures supported on their graphs and operators by graph-preserving pushforwards. This viewpoint connects discrete data with continuum operators and yields constructive approximation results. Turning from approximation to sample complexity, we show how compressibility in phase space makes a class of double fibration transforms, including Radon and geodesic ray transforms, learnable from few input–output examples, even when their geometry is unknown. Finally, we use the method of characteristics to motivate Flowers, neural PDE surrogates built from state-dependent pullbacks. Despite their simplicity, Flowers outperform Fourier-, convolution-, and attention-based models of comparable size across a broad range of two- and three-dimensional PDE benchmarks.</div><div class="event_time">16:30 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2</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/aa/?events">Neuchatel - St.Gallen - Zurich Seminar in Coding Theory and Cryptography</a></div><br /><div class="event_speaker">Mike Ineichen</div><div class="event_title">Decoding Algorithms for Moderate-Density Parity-Check Codes <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>In this presentation we introduce a wide variety of decoding methods for MDPC codes, collected from many different authors. These include BIKE-Flip, the decoder used in the most sophisticated MDPC-based application to date named BIKE. We test the decoding performance of these decoders on QC-MDPC codes by measuring how many errors each method can correct, and we extrapolate the theoretical DFR at BIKE Level 1 parameters using the decoders that are strong enough to reach their waterfall region before the block size r = 12323. We then introduce different methods for generating MDPC codes and conclude that, unless a catastrophic attack exploiting the quasi-cyclic structure of QC-MDPC codes is found, there is no benefit in using other generation methods for MDPC codes. Finally, we inspect the row weight of parity-check-induced MDPC codes and examine how the performance differs.&lt;/p></div><div class="event_time">16:30 &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/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Fredrik Viklund (KTH Royal Institute of Technology)</div><div class="event_title">Confined planar Coulomb gases <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss probabilistic and analytic aspects of two-dimensional Coulomb gases confined to Jordan domains, curves, and arcs. In particular, I will describe the asymptotic behavior of particle distributions as the number of particles tends to infinity. I will also explain how the Loewner energy and related quantities arise in the asymptotic expansion of the free energy. A key analytical tool throughout is the Grunsky operator. The talk is based on joint work with Kurt Johansson and Klara Courteaut.</div><div class="event_time">17:15 &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, September 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/fim/activities/nachdiplom-lectures">Nachdiplomvorlesung</a></div><br /><div class="event_speaker"> Cristopher Moore (Santa Fe Institute)</div><div class="event_title">Computational complexity and phase transitions</div><div class="event_time">10:15 &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_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"> Kaibo Hu (University of Oxford)</div><div class="event_title">Finite Element Tensor Calculus</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://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"> Alan Reid (Rice University)</div><div class="event_title">Arithmetic groups and their profinite completions</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_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"> Leonid Polterovich (Tel Aviv University)</div><div class="event_title">Lagrangian cobordisms and persistence modules <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Persistence modules and their barcodes are algebraic tools from topological data analysis. We introduce an invariant of morphisms between persistence modules and discuss its applications to the geometry of Lagrangian cobordisms between Legendrian submanifolds. This is joint work in progress with Michael Entov.</div><div class="event_time">15:00 &bull; Université de Neuchâtel, Rue Emile-Argand 11, Room B013</div>        </div>        <div class="day_content_item normal"><div class="event_location uni_default">Uni ???</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">Dr. Jakob Felix Oldenburg (Université Paris Dauphine-PSL)</div><div class="event_title">The inverse problem of time-dependent density functional theory on the torus <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />&lt;p>&lt;span style="caret-color: #000000; color: #000000; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">We prove that, for any given sufficiently regular one-particle density, there exists a unique external potential for which the solution to the many-body Schr&ouml;dinger equation has this prescribed density. This implies in particular that one can exactly reproduce the time-dependent density of an interacting system using non-interacting electrons, which is at the heart of time-dependent density functional theory. Our result covers the Coulomb interaction and densities arising from extended nuclei. Joint work with Asbj&oslash;rn B&aelig;kgaard Lauritsen and Mathieu Lewin.&lt;/span>&lt;/p></div><div class="event_time">16:15 &bull; Location T.B.A.</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, September 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://www.unige.ch/math/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Veronica Fantini</div><div class="event_title">Title T.B.A.</div><div class="event_time">14:00 &bull; Université de Genève, Conseil Général 7-9, Room 8-02</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"> Benjamin Ellis-Bloor (Northwestern University)</div><div class="event_title">Cobordism and the moduli of curves <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />I will discuss the problem of expressing the cobordism class of Mbar_{0,n} as a polynomial in generators of the cobordism ring. With rational coefficients, a method was given by Coates and Givental. With integer coefficients, we will get a recursion by lifting the string equation, introduced by Witten, to algebraic cobordism in genus 0. This recovers known closed formulas for invariants of Mbar_{0,n} such as the Poincaré polynomials, and gives new closed formulas for invariants such as certain twists of the chi_y-genus. I will also explain how equivariant localization in cobordism can alternatively be used, and the outlook in higher genus.</div><div class="event_time">16:00 &bull; ETH Zentrum, R&auml;mistrasse 101, Z&uuml;rich, Building HG, Room G 19.2 + Zoom</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>';