Arithmetic Algebraic GeometryJan Nekovář was a mathematician who worked and has made many significant and seminal contributions to algebraic geometry. He left us prematurely in November 2022. Here is a tribute note (in French) by Pierre Colmez.In his memory, Anna Cadoret, IMJ-PRG, Wiesława Nizioł, IMJ-PRG, and Sarah Zerbes, ETH Zürich, organize a conference in arithmetic algebraic geometry at IHES from October 9th to 13th, 2023.This is an international conference in arithmetic geometry, aimed at covering some of the most recent advances in the field with a focus on the areas Jan Nekovář was interested in. Invited Speakers:Tomoyuki Abe, IPMU – University of Tokyo  Spencer Bloch, University of Chicago  Ana Caraiani, Imperial College London – University of BonnHenri  Darmon, McGill University  Vesselin Dimitrov, Institute for Advanced Studies  Matthew  Emerton, University of Chicago  Veronika  Ertl, Universitat Regensburg  Hélène Esnault, Frei Universität Berlin  Olivier Fouquet, Université de Franche-Comté Alexander Goncharov, Yale University  Giada Grossi, CNRS, Université Sorbonne Paris Nord      Jie Lin, Universität Duisburg-Essen  David  Loeffler, University of Warwick   Akhil Mathew, University of Chicago   James Newton, University of Oxford  Alexander Petrov, Harvard University  Alena Pirutka, New York University  Tony Scholl, University of Cambridge   Yunqing Tang, University of California – Berkeley  Jacob Tsimerman, University of Toronto    IHES thanks all the donors of the 2021 Friends of IHES Gala for making this conference possible.

À l’occasion du centenaire de la naissance de René Thom, l’IHES organise trois jours de conférence les 20, 21 et 22 septembre 2023. Conférenciers invités : Norbert A’Campo, Univ. De BâleDaniel Bennequin, Institut Mathématique de Jussieu (IMJ-PRG)Alain Chenciner, IMCCE/Observatoire de Paris Antoine Danchin, Institut Pasteur                     Ivar Ekeland, Université Paris-DauphineSara Franceschelli, ENS LyonEmmanuel Giroux, CNRS et ENSMikhail Gromov, IHESKrzysztof Kurdyka, Université Savoie Mont BlancCherif Matta, Mount Saint Vincent University, Halifax, CanadaJean Petitot, EHESSOscar Randal-Williams, Université de CambridgeAna Rechtman, Université Grenoble-AlpesDennis Sullivan, City University of New York, Graduate Center                       Bernard Teissier, IMJ-PRGWolfgang Wildgen, Université de BrêmeComité scientifique : Marie-Claude Arnaud, IMJ-PRG, Marc Chaperon, IMJ-PRG, coordinateur, Antoine Danchin, Institut Pasteur, Yakov Eliashberg, Stanford University, Maxim Kontsevich, IHES, Cédric Villani, Université Lyon I & IHESComité d’organisation : Jean-Pierre Bourguignon, IHESRené Thom (1923-2002)Professeur permanent à l’IHES de 1963 à 1990René Thom a couvert un champ scientifique immense : d’abord en ouvrant des champs nouveaux en topologie, cette branche des mathématiques qui s’intéresse aux formes à déformation près, et dans l’étude de la dynamique. Il a ensuite créé une « mathématique de la morphogenèse », proposant des modèles pour la biologie et aussi pour les sciences humaines.Ces proposi­tions, souvent regroupées sous le nom de « théorie des catastrophes », ont quelque fois été controversées. René Thom a consacré la suite de sa vie scientifique à l’étude de la biologie théorique et surtout à la philosophie aristotélicienne.

The scope of this in-person week-long meeting that will take place at the Institut des Hautes Études Scientifiques (IHES) in Bures-sur-Yvette, is to bring together scientists from the LSC Committee with invited experts and the IHES scientists to present the latest progress in understanding evolution as a process of learning, and conversely, evolution of learning, in the context of their respective disciplines, to fuel discussion of the challenges and brainstorm on synergistic solutions.INVITED SPEAKERS:INVITED SENIOR GUESTS:INVITED JUNIOR GUESTS:More details in the Profiles section. ORGANIZERS:Yves Barral, ETH ZurichEugene Koonin, NIHMikhail Gromov, IHES & NYUBob Penner, IHES & UCLASCIENTIFIC COMMITTEE:Yann LeCun, NYU & Meta AINicolas Minc, U. Paris Cité/CNRSPierre-Yves Oudeyer, INRIA BordeauxYukiko Yamashita, MITEXECUTIVE ORGANIZATION: Grazia Gonella, ETH ZurichCONTACT: lsc@biol.ethz.ch

The year 2023 marks the centenary of the birth of Louis Michel, the first Professor of Theoretical Physics at IHES. On this occasion, Thibault Damour and Slava Rychkov organize a one-day commemoration on May 15, 2023, at IHES. Several presentations will be given by lecturers linked to Louis Michel or to his work:Jean-Pierre Bourguignon, CNRS-IHESHenri Epstein, CNRS-IHESDenis Gratias, CNRS-Institut de Recherche de Chimie ParisDavid Ruelle, IHESSlava Rychkov, IHESMarjorie Senechal, Smith CollegeBoris Zhilinskii, Univ. du Littoral Côte d’OpaleOrganizers: Thibault DAMOUR (IHES) and Slava Rychkov (IHES).

“Wall-Crossing Structures, Analyticity, and Resurgence”,  a mini-school organized by Maxim Kontsevich and Yan Soibelman This conference is organized by Maxim Kontsevich (IHES), and Yan Soibelman (Kansas State University).The main emphasis will be on the new approach to resurgent series via analytic wall-crossing structures (an alternative to the traditional alien calculus), as well as the detailed study of examples coming from quantum Chern-Simons theory, WKB expansions and, more generally, holomorphic Floer theory.The program includes 3 mini-courses, given by:Jørgen E. Andersen (SDU)Maxim Kontsevich (IHES)Yan Soibelman (Kansas State University)and research presentations, given by:Philip Boalch (IMJ-PRG)Pierrick Bousseau (University of Georgia)Veronica Fantini (IHES)Segei Gukov (Caltech)Lotte Hollands (Heriot Watt University)Kohei Iwaki (The University of Tokyo)Marcos Mariño (University of Geneva)William Mistegård (SDU)David Sauzin (Observatoire de Paris-Meudon)Campbell Wheeler (MPI Bonn)

A Multiscale tour of Harmonic Analysis and Machine LearningTo Celebrate Stéphane Mallat’s 60th birthdayStéphane Mallat, professor at the Collège de France in data science, will be honored during a three-day workshop, April 19-21, 2023, organized by Joan Bruna, New York Univ., and Gabriel Peyré, CNRS-ENS, on the occasion of his 60th birthday. The purpose of this meeting is to bring together some of the characters of Data Analysis and Machine Learning, past, present, and future – and to celebrate the 60th birthday of a leading one, Stéphane Mallat, professor at Collège de France.His journey through Harmonic Analysis, Machine Learning, and Physics has profoundly influenced how these areas have evolved and blended together, and are now breaking new ground in our theoretical understanding of modern data analysis.Speakers:Akram Aldroubi, VanderbiltFrancis Bach, INRIARichard Baraniuk, RiceFreddy Bruckstein, TechnionEmmanuel Candès, StanfordMaureen Clerc, INRIAMaarten De Hoop, RiceDave Donoho, StanfordMichael Elad, TechnionRémi Gribonval, INRIAStéphane Jaffard, CréteilJérôme Kalifa, Let it CareHamid Krim, North Carolina State UniversityGitta Kutyniok, MünchenYann LeCun, New York University, and MetaEric Moulines, PolytechniqueEdouard Oyallon, CNRS and SorbonneNaoki Saito, UC DavisGuillermo Sapiro, DukeShihab Shamma, MarylandEero Simoncelli, New York UniversityJean-Jacques Slotine, MITMichael Unser, EPFLMartin Vetterli, EPFLIrène Waldspurger, CNRS and DauphineBin Yu, Berkeley 

Advances in Nonlinear Analysis and Nonlinear WavesFrank Merle, a mathematician, and holder of the Université de Cergy-Pontoise – IHES Chair in Analysis has made many important and seminal contributions to the qualitative study of solutions of nonlinear partial differential equations coming from Physics. Merle’s work has been pioneering in the sharp analysis of blowup solutions, and the collision of solitons, as well as in the soliton resolution conjecture. His groundbreaking works have been very influential in the field and beyond.Throughout his career, Frank Merle received many distinctions, including:ICM Invited Speaker (1998)Bôcher Memorial Prize – American Mathematical Society (2005)Silver Medal – Centre National de la Recherche Scientifique (2005)ERC Advanced Grant « Blow-up, Dispersion and Solitons » (2011)ICM Plenary Speaker (2014)Grand prix Ampère de l’électricité de France – French Academy of Sciences (2018)Member of the Academia Europaea (2020)The scientific objective of the conference is twofold. First, several experts in the field of dispersive and wave equations will present their recent advances. A second objective is to propose some conferences in analysis beyond the field of dispersive PDEs. The Scientific Committee hopes that all talks will be accessible to a general audience in analysis.Scientific Committee: M. Dafermos, A.-L. Dalibard, H. Duminil-Copin, T. Duyckaerts, E. Hebey, Y. Martel, G. Ponce, P. Raphaël, L. Saint-Raymond et H. ZaagOrganising Committee: C. Collot, R. Côte, F. Demengel, T. Duyckaerts, J. Jendrej, Y. Lan, E. Logak, Y. Martel, C. Muñoz, P. Raphaël, J. Szeftel, N. Tzvetkov et H. ZaagInvited Speakers:Henri Berestycki, EHESSNicolas Burq, Université de Paris-SaclaySimon Brendle, Columbia UniversityMaria Colombo, EPFLCamillo De Lellis, IASThierry Giamarchi, Université de GenèveFrançois Golse, École polytechniqueOana Ivanovici, CNRS & Sorbonne UniversitéCarlos Kenig, University of ChicagoSergiu Klainerman, Princeton UniversityPierre-Louis Lions, Collège de FranceNader Masmoudi, NYUHiroshi Matano, Meiji UniversityAndrea Nahmod, University of MassachusettsFelix Otto, Max-Planck Institut fur MathematikPierre Raphaël, University of CambridgeIgor Rodnianski, Princeton UniversityWilhelm Schlag, Yale UniversitySylvia Serfaty, NYUDaniel Tataru, UC BerkeleyLuis Vega, BCAMSijue Wu, University of MichiganThis event will be held at IHES, Bures-sur-Yvette, and at CY Advanced Studies, and is open to all.Registration is free and open until April 21, 2022.

The aim of this workshop is to bring together mathematicians and computer scientists around some talks on recent results from statistics, machine learning, and more generally data science research. Various topics in machine learning, optimization, deep learning, optimal transport, inverse problems, statistics, and problems of scientific reproducibility will be presented. This workshop is particularly intended for doctoral and post-doctoral researchers.Registration is free and open until March 1, 2023.Organizers: Gilles Blanchard (LMO/Université Paris-Saclay)Florence Tupin (LTCI/Télécom Paris)Invited speakers:Isabelle Bloch (LIP6/Sorbonne Université – LTCI/Télécom Paris)Antoine Cornuéjols (MIA/AgroParisTech)Aymeric Dieuleveut (CMAP/École polytechnique)Elisabeth Gassiat (LMO/Université Paris-Saclay)Mohammed Nabil El Korso (L2S/CentraleSupélec)Mathilde Mougeot (ENSIIE & Centre Borelli/ENS Paris-Saclay)

2023 IHES SUMMER SCHOOLOrganizing Committee: Benjamin Antieau (Northwestern University), Lars Hesselholt (University of Copenhagen / Nagoya University), and Matthew Morrow (CNRS and Université Paris-Saclay)Scientific Committee: Bhargav Bhatt (IAS and Princeton University / University of Michigan), Wiesia Niziol (CNRS and Sorbonne Université), and Akhil Mathew (University of Chicago) The Summer School will be held at the Institut des Hautes Etudes Scientifiques (IHES) from July 10 to 21, 2023. IHES is located in Bures-sur-Yvette, south of Paris (40 minutes by train from Paris) – Access mapThis school is open to everybody but intended primarily for young participants, including Ph.D. students and postdoctoral fellows. Please note that there won’t be remote transmission through Zoom but mini-courses and talks will be filmed and posted on the IHES YouTube channel in the following days.Application is open until February 15, 2023. In the style of an Oberwolfach Arbeitsgemeinschaft, ten talks will be given by postdoctoral participants on the topic of syntomic and étale motivic cohomology. Once the detailed list of talks is available, postdoctoral applicants will be contacted to ask which talk they would be willing to give.2023 IHES Summer School – Recent Advances in Algebraic $K$-theoryThe last few years have witnessed an explosion of progress in algebraic $K$-theory. Derived algebraic geometry and non-commutative methods have been refined into powerful tools, especially through the theory of localizing invariants. Trace methods have brought $K$-theory and topological cyclic homology closer together than ever before. Perfectoid techniques mean that $K$-theory benefits from the recent progress in $p$-adic cohomology, such as prismatic cohomology. Condensed mathematics provides at long last a uniform approach to the $K$-theory of topological rings. Geometric foundations for motivic stable homotopy theory have been laid and new motivic filtrations have been unearthed.The goal of the Summer School will be to help bring the participants up to date on these exciting developments, via research lectures, mini-courses, and an Arbeitsgemeinschaft on the topic of syntomic and étale motivic cohomology.MINI-COURSES:Johannes Anschutz (University of Bonn) and Arthur-César Le Bras (CNRS and Université de Strasbourg)Dustin Clausen (University of Copenhagen and IHES)Elden Elmanto (Harvard University)Ryomei Iwasa (Université Paris-Saclay)Georg Tamme (University of Mainz)SPEAKERS:Kęstutis ČESNAVIČIUS (CNRS and Université Paris-Saclay)Shane KELLY (University of Tokyo)Moritz KERZ (University of Regensburg)Hana Jia KONG (Institute for Advanced Study)Achim KRAUSE (University of Münster)Thomas NIKOLAUS (University of Münster)Arpon RAKSIT (Massachusetts Institute of Technology)Charanya RAVI (Indian Statistical Institute, Bangalore)Kirsten WICKELGREN (Duke University)Maria YAKERSON (CNRS and Sorbonne Université) This is an IHES Summer School organized in partnership with the Clay Mathematical Institute and in part of a project that has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 101001474).

Arbre de Noël du GDR »Géométrie non-commutative »La géométrie non-commutative, fondée par Alain Connes, est un domaine de recherche important des mathématiques actuelles. Le GDR « Géométrie Non-commutative » du CNRS regroupe l’ensemble des chercheurs français travaillant sur des thématiques en lien avec ce domaine. L’arbre de Noël, organisé par Amaury Freslon (LMO – Université Paris-Saclay) et co-organisé par Maria-Paula Gomez-Aparicio (Université Paris-Saclay), est la rencontre annuelle de ce GDR. La parole y est donnée aux jeunes chercheurs du domaine, doctorants et post-doctorants, qui peuvent ainsi présenter leurs travaux à la communauté. Quelques exposés de chercheurs confirmés complètent cette rencontre en offrant un panorama des évolutions actuelles.Conférenciers invités :Benjamin Anderson-Sackaney, Université de Caen-NormandieSara Azzali, Università di BariLéonard Cadilhac, Sorbonne UniversitéPurbayan Chakraborty, Université de Bourgogne-Franche-ComtéAlain Connes, IHESClément Dell’Aiera, ENS LyonAmine Marrakchi, ENS LyonPaul Meunier, KU LeuvenGilles Pisier, Sorbonne Université – Texas A&M UniversityArthur Troupel, Université Paris-CitéZhenguo Wei, Université de Bourgogne-Franche-ComtéXu Zhendong, Université de Bourgogne-Franche-ComtéKai Zeng, Université de Bourgogne-Franche-Comté

Combinatorics and Arithmetic for Physics: special daysThe meeting’s focus is on questions of discrete mathematics and number theory with an emphasis on computability. Problems are drawn mainly from theoretical physics: renormalization, combinatorial physics, geometry, evolution equations (commutative and noncommutative), or related to its models, but not only. Computations, based on combinatorial structures (graphs, trees, words, automata, semirings, bases), or classical structures (operators, Hopf algebras, evolution equations, special functions, categories) are good candidates for computer-based implementation and experimentation.Organised by : Gérard H. E. DUCHAMP, Maxim KONTSEVICH, Gleb KOSHEVOY, Sergei NECHAEV, and Karol A. PENSON.Speakers:Cyril Banderier (CNRS, Univ. Paris Nord) Nicolas Behr (CNRS, Université Paris Cité, IRIF) Gérard H. E. Duchamp (LIPN, Université Paris Nord) Vladimir Fock (Strasbourg Univ.)Nihar Gargava (EPFL, Cambridge)Volker Genz (IBS CGP)Sasha Gorsky (IITP RAS) Darij Grinberg (Drexel University) Dimitry Gurevich (IITP, Moscou) Béa de Laporte (University of Cologne)Richard Kerner (LPTMC, Sorbonne Univ.) Maxim Kontsevich (IHES) Paul-André Melliès (CNRS, Université Paris Cité, IRIF) Frédéric Patras (CNRS, Univ. Côte d’Azur) Karol A. Penson (LPTMC, Sorbonne Univ.) Travis Scrimshaw (Hokkaido University) Thomas Simon (Laboratoire Paul Painlevé, Univ. Lille) Lauren Williams (Harvard University) Sergey Yurkevich (Univ. of Vienna & INRIA)Sponsors: IHESLPTMC (Univ. Paris 6)LIPN UMR CNRS-7030I.S.C.P. (UMI 2615 CNRS)

Homogeneous Dynamics and Geometry in Higher-Rank Lie Groups   The goal of the workshop is to explore links between homogeneous dynamics and recent developments on infinite-covolume discrete subgroups of Lie groups, including images of Anosov representations and generalizations. There will be three minicourses and a dozen research talks. This workshop is organized by Martin Bridgeman (Boston College), Richard Canary (University of Michigan), Fanny Kassel (CNRS & IHES), Hee Oh (Yale University), Maria Beatrice Pozzetti (Universität Heidelberg), and Jean-François Quint (CNRS & Université de Bordeaux).Minicourses: Jean-François Quint (CNRS & Université de Bordeaux) – “Dynamics on Higher-rank Lie Groups” [3h] Tengren Zhang (National University of Singapore) – “Anosov Representations” [3h]Andrés Sambarino (CNRS & IMJ-PRG) & Minju Lee (University of Chicago) – “Recent Developments” [2+2h]Research Talks:Pierre-Louis Blayac (University of Michigan) León Carvajales (Universidad de la Republica, Montevideo) Nguyen-Thi Dang (Université Paris-Saclay) Sam Edwards (Durham University) François Labourie (Université Côte d’Azur) Sara Maloni (University of Virginia) Giuseppe Martone (Yale University) Wenyu Pan (University of Toronto) Rafael Potrie (Universidad de la Republica, Montevideo) Pratyush Sarkar (UC San Diego) Andrew Zimmer (University of Wisconsin, Madison)