var sms = '<div id="sms_bulletin">  <div id="sms_header">  <div class="do_not_print" id="arrow_left"><a href="?next=-9"><img src="//www2.math.ethz.ch/smsjs/images/arrow_left.png"/></a></div><div class="do_not_print" id="arrow_right"><a href="?next=-7"><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. 1</span>      <span style="float: right; text-align:right; width: 250px;">1.6 - 5.6.2026</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 1      </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"> Miltiadis  Stouras</div><div class="event_title">Title T.B.A.</div><div class="event_time">11:00 &bull; EPF Lausanne, INJ114</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://theory.epfl.ch/seminar/">Theory and Combinatorics Seminar</a></div><br /><div class="event_speaker"> Erik  Waingarten</div><div class="event_title">Better Algorithms for Better Neighbors <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Nearest neighbor search has a long history in theoretical computer science, and in the past decade has seen an explosion of usage. This has been primarily driven by embedding models that represent complex data—text, images, and video—as high-dimensional vectors, shining a new spotlight on vector retrieval. I\'ll discuss ongoing work with Ashwin Padaki and Sanjeev Khanna exploring new theoretical takes on this problem, studying nearest neighbors from a data-driven perspective.</div><div class="event_time">11:15 &bull; EPF Lausanne, BC229</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://www.epfl.ch/labs/stoan/probability-stochastic-analysis-seminar/">Probability (and Stochastic Analysis) Seminar </a></div><br /><div class="event_speaker"> Hong  Wang ( IHES & NYU)</div><div class="event_title">A survey of Stein\'s restriction conjecture <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Stein\'s Restriction conjecture concerns functions whose Fourier transform is supported on the unit sphere in R^n. Over the decades, progress on this problem has drawn on tools from combinatorics, real algebraic geometry, and other areas. We will survey the development of  the conjecture and discuss its recent connections to projection theory. </div><div class="event_time">15:00 &bull; EPF Lausanne, GA 3 21</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/mpseminar/seminar.html">Séminaire de Mathématique Physique </a></div><br /><div class="event_speaker"> Sergei  Nechaev</div><div class="event_title">Three faces of random walks in the hyperbolic domain: BKT, Lifshitz tails, and KPZ <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Random walks in the Poincaré hyperbolic upper halfplane H provide a unifying framework linking three seemingly unrelated phenomena: (i) the non-analytic divergence of corrrelation length at the Berezinskii-Kosterlitz-Thouless (BKT) transition; (ii) the appearence of the Kardar-Parisi-Zhang (KPZ) exponent in the fluctuational behavior of stretched random walks constrained above an impermeable disc; and (iii) the emergence of Lifshitz tails in one-dimensional statistics of rare events. Combining scaling arguments with analytic derivations and numerical analysis, we adapt the renormalization-group equations originally developed for the Efimov effect in a two-dimensional conformally invariant potential to the case of diffusion in H, thereby deriving the BKT-type divergence of the correlation length. We further demonstrate how the KPZ-type scaling governs the large-deviation behavior and survival probability near the boundary in H, and how Lifshitz tails arise naturally in a deterministic large-deviation landscape on H via instanton approach, reproducing the rare-event statistics of one-dimensional diffusion in the array of traps with the Poisson distribution. We conjecture that the dominant contribution to the ensemble of paths responsible for BKT-like physics comes from random paths pushed to large-deviation (stretched) regime in H.</div><div class="event_time">16:15 &bull; Université de Genève, Conseil Général 7-9, Room 1-15</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Tuesday, June 2      </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"> Roland Masson</div><div class="event_title">Polytopal nodal discretisation of mixed dimensional poro-mechanical models in geological media, application to fault reactivation and induced seismicity <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Subsurface resources—such as deep geothermal energy, underground hydrogen storage, and geological CO&#8322; sequestration—are key pillars of the energy transition and sustainable development. However, fluid injection and extraction alter the pressure and stress state of the surrounding rock, potentially triggering fault reactivation and induced seismicity. Predicting and mitigating these risks is therefore essential for the safe and sustainable use of the subsurface.In this context, numerical simulation provides a powerful framework for understanding, predicting, and managing such coupled processes. The proposed model integrates Darcian fluid flow in both the porous matrix and fault network, poroelastic deformation of the surrounding rock, and frictional contact along faults. A key feature is the incorporation of dynamic friction governed by rate-and-state laws, in which the friction coefficient depends on slip velocity and an evolving state variable.We present a polytopal discretization approach for simulating these coupled processes, explicitly accounting for fault networks and rate-and-state friction behavior. The contact mechanics formulation relies on a mixed approach combining the Virtual Element Method with bubble stabilization and a face-wise constant approximation of tractions. Time integration is fully implicit, with adaptive time stepping and tailored block preconditioners that exploit the structure of the discrete contact problem. Fluid flow in the mixed-dimensional setting is discretized using a conservative Hybrid Finite Volume scheme, while poromechanical coupling is handled through iterative algorithms.The methodology is demonstrated on a fault reactivation scenario relevant to CO&#8322; sequestration, highlighting its capability to capture the interplay between fluid flow, deformation, and fault slip.</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_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"> Claudio Onorati (Bologna)</div><div class="event_title">Birational automorphism groups in families of hyper-Kähler manifolds <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Given a non-trivial polarised family of hyper-Kähler manifolds, we study the behavior of the groups of birational transformations of the members of the family. We prove that, at least when the members belong to one of the known deformation classes, there always exists an open and dense subset on the base, where this group is infinite for any member in this subset. This is a joint work with F. Denisi, F. Rizzo and S. Viktorova.</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/analysis-seminar">Analysis Seminar</a></div><br /><div class="event_speaker">Dr. Clara  Torres-Latorre (ICMAT (Madrid))</div><div class="event_title">A Pohozaev identity for the Spectral Fractional Laplacian <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Pohozaev identities are conservation laws arising from the symmetries ofcertain operators. Their most classical example, which gives name tothem, is an integration by parts identity that exploits the translationand dilation invariances of the Laplacian, with notable applications innonexistence results for semilinear equations.In this work, we use a novel spectral approach to prove a Pohozaev-typeidentity for the Spectral Fractional Laplacian, an operator withouttranslation and dilation invariances defined as the spectral power ofthe Dirichlet Laplacian on a domain, and we deduce nonexistence resultsfor certain semilinear equations.This is a joint work with Itahisa Barrios-Cubas, María del Mar González,and Matteo Bonforte (Universidad Autónoma de Madrid).</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">        Wednesday, June 3      </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/de-rham/">Journée Georges de Rham </a></div><br /><div class="event_speaker"> Hong Wang (IHES & NYU)</div><div class="event_title">Kakeya sets in R^3 <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />A Kakeya set is a compact subset of R^n that contains a unit line segment pointing in every direction.  Kakeya set conjecture asserts that every Kakeya set has Minkowski and  Hausdorff dimension n. We prove this conjecture in R^3 as a consequence of a more general statement about union of tubes. Joint work with Josh Zahl. </div><div class="event_time">15:00 &bull; EPF Lausanne, Polydome PO 01</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://www.epfl.ch/schools/sb/research/math/de-rham/">Journée Georges de Rham </a></div><br /><div class="event_speaker"> Emmanuel Candès (Stanford)</div><div class="event_title">What Statistics and AI O&#64256;er Each Other? <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />AI inputs and outputs yields more powerful, safer AI. By examining several vignettes, we shall answer questions such as: how do we train language models under cost constraints? What happens when we’ve exhausted all available data? If I start a clinical trial using the drug AI thinks is best, will it pan out? How can we ensure high-quality products when AI is used in a larger workflow? That is, how do I know whether AI automated a task correctly? AI powered imputations are beginning to substitute for real data when collection of the latter is difficult, slow, or costly. How then should we leverage machine learning predictions both as a substitute for high-quality data and as a tool for guiding real data collection?</div><div class="event_time">15:00 &bull; EPF Lausanne, Polydome PO 01</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/seminar-on-stochastic-processes">Seminar on Stochastic Processes</a></div><br /><div class="event_speaker">Prof. Dr. Mladen Savov (University of Sofia)</div><div class="event_title">Exchangeable measure-valued Pólya sequences <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Measure-valued Pólya sequences (MVPS) are stochastic processes whose dynamics are governed by generalized Pólya urn schemes with infinitely many colors. Assuming a general reinforcement rule, MVPSs can be viewed as extensions of Blackwell and MacQueen’s Pólya sequence, which characterizes an exchangeable sequence with a Dirichlet process (DP) prior distribution.In this talk, we give a complete account of the class of exchangeable MVPSs in terms of their prior distributions. First, we show that under exchangeability, an MVPS is necessarily balanced and its reinforcement kernel is, after normalization, a regular conditional distribution.As a result, its prior distribution is that of a DP mixture with respect to a latent parameter, which is associated with the conditioning sigma-algebra. Furthermore, we examine the effects of relaxing exchangeability to conditional identity in distribution and find that the two are equivalent for balanced MVPSs.In the second part of the talk, we study Hoeffding decomposability under exchangeability and provide a complete characterization of the class of exchangeable Hoeffding-decomposable sequences. In particular, we show that there exists a random parameter, conditional on which an exchangeable Hoeffding-decomposable sequence is an MVPS.Joint work with Chorbadzhiyska, Y., Sariev, H. and Gerdjikov, S.</div><div class="event_time">17:15 &bull; UZH Irchel, Winterthurerstrasse 190, Z&uuml;rich, Building Y27, Room  H12</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Thursday, June 4      </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"> Filippo Paiano (Università di Pisa)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/studium/mathematik/doktorat/bernoullis-tafelrunde/detail/bernoullis-tafelrunde-filippo-paiano-universita-di-pisa/">When the Domain is the Unknown: An Introduction to Free Boundary Problems</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Abstract A free boundary problem is a PDE problem with overdetermined boundary conditions; at the boundary, both the value of u and ? u are prescribed -- or, informally, the domain itself is part of the unknown. In this talk, I will explain how one can rigorously formulate them, and discuss their challenges and strengths through two paradigmatic examples: the Bernoulli one-phase problem, an elliptic case, and the Stefan problem, a parabolic one. No prior knowledge of the topic is required.</div><div class="event_time">12:15 &bull; Universität Basel, Seminarraum 00.003, Spiegelgasse 1</div>        </div>        <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/forschung/mathematik/zahlentheorie/">Seminar Zahlentheorie</a></div><br /><div class="event_speaker"> Martin Widmer (TU Graz)</div><div class="event_title"><a class="external" href="https://dmi.unibas.ch/de/news-events/detail/number-theory-seminar-martin-widmer-tu-graz/">Title T.B.A.</a> <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Height lower bounds for elements in highly composite rings Abstract: Let $\\alpha$ be a non-zero algebraic number and not a root of unity. Then its absolute Weil height $h(\\alpha)$ is positive. How small can it be in terms of the degree of $\\alpha$? Lehmer\'s conjecture states that the height does not decay faster than the reciprocal of the degree. Amoroso and Dvornicich showed that there is no decay at all, provided $\\mathbf{Q}(\\alpha)/\\mathbf{Q}$ is an abelian extension. If we further require that $\\alpha$ lies in $\\mathbf{Q}^{(d)}$, the composite field of all number fields of degree at most $d$, then the height tends to infinity, as was shown by Bombieri and Zannier. What happens for arbitrary $\\alpha \\in \\mathbf{Q}^{(d)}$? We will present some new results on this unsolved question. This is ongoing joint work with Siu Hang Man, Niclas Technau, and Pavlo Yatsyna. Seminarraum 05.002, Spiegelgasse 5</div><div class="event_time">14:15 &bull; Universität Basel</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"> Ritabrata  Munshi  (TIFR & Kolkata)</div><div class="event_title">Moment and nonvanishing of quadratic twists <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />Recently, in a series of papers, Blomer, Fouvry, Kowalski, Michel, Milicevic and Sawin, proved an asymptotic with a power saving error term, for the second moment of GL(2) L-functions over the family of twists. The corresponding problem for the family of quadratic twists still remain open, although in a recent breakthrough, Xiannan Li has established an asymptotic with a fractional log saving. In this talk, we will consider the analogous case of half integral weight forms.</div><div class="event_time">14:15 &bull; EPF Lausanne</div>        </div>      </div>    </div>    <div class="day">      <div class="day_title">        Friday, June 5      </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"> Lucas  Gerth  (Sorbonne Univeristé)</div><div class="event_title"> Moduli spaces of analytic p-divisible groups <span class="abstract-button do_not_print">abstract</span></div><div class="abstract-text" style="display: none"><strong>Abstract:</strong><br />We prove a classification of families of analytic p-divisible groups on adic spaces S over Qp in terms of Hodge–Tate triples, generalizing a theorem of Fargues. From this, for S a perfectoid space, we construct an analytic Dieudonné theory with values in mixed characteristic Shtukas over the Fargues–Fontaine disc. As applications, we realize the local Shimura varieties of EL and PEL type of Scholze--Weinstein as moduli spaces of analytic p-divisible groups with framed universal cover, and we reinterpret the Hodge–Tate period map of Scholze in terms of topologically p-torsion subgroups of abelian varieties.</div><div class="event_time">14:00 &bull; EPF Lausanne, CM 012</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>';