BEGIN:VCALENDAR VERSION:2.0 PRODID:-//Département de mathématiques et applications - ECPv6.2.2//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-ORIGINAL-URL:https://www.math.ens.psl.eu X-WR-CALDESC:évènements pour Département de mathématiques et applications REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:Europe/Paris BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20170326T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20171029T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20180325T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20181028T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0100 TZOFFSETTO:+0200 TZNAME:CEST DTSTART:20190331T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0200 TZOFFSETTO:+0100 TZNAME:CET DTSTART:20191027T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20190514T140000 DTEND;TZID=Europe/Paris:20190514T170000 DTSTAMP:20260611T053507 CREATED:20190514T120000Z LAST-MODIFIED:20211104T135214Z UID:8510-1557842400-1557853200@www.math.ens.psl.eu SUMMARY:Après-midi de théorie de groupes DESCRIPTION:14.00-14.45 Stefan Witzel (Ecole Polytehchnique)15.00-15.45 Katie Vokes (IHES)15.45-16.15 coffee break16.15-16.45 Adrien Le Boudec (ENS Lyon)Stefan Witzel\, Arithmetic approximate groups and their finiteness propertiesI will talk about approximate groups\, a geometric generalization of groups. Approximate groups were discovered independently in various contexts and I will describe how they arise very naturally in the context of arithmetic groups. I will then explain how to extend topological finiteness properties of groups to approximate groups. This allows to make a connection betweenarithmetic groups in positive characteristic and arithmetic approximate groups in characteristic zero. The talk is based on joint work with Tobias Hartnick.Katie Vokes\, Hierarchical hyperbolicity of graphs associated to surfacesIn a paper of 2000\, Masur and Minsky studied the geometry of mapping class groups of surfaces using projections to certain Gromov hyperbolic graphs (the curve graphs) associated to subsurfaces. This inspired the definition by Behrstock\, Hagen and Sisto of hierarchically hyperbolic spaces\, which are equipped with similar projection maps\, satisfying conditions which guarantee a structure analogous to that of the mapping class group. I will give some background on these concepts and present a result demonstrating that a large family of graphs associated to surfaces are hierarchically hyperbolic spaces.Adrien Le Boudec\, Simple groups having a wreath product as a geometric modelThe goal of the talk will be to describe groups that are finitelygenerated\, simple\, and that act properly and cocompactly on thenatural Cayley graph of the wreath product A wr F\, where A is afinite group and F a non-abelian free group. URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-de-groupes-3/ LOCATION:Salle W (DMA) CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20190416T140000 DTEND;TZID=Europe/Paris:20190416T170000 DTSTAMP:20260611T053507 CREATED:20190416T120000Z LAST-MODIFIED:20211119T102741Z UID:8506-1555423200-1555434000@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:14.00 -14.45 Cornelia Drutu (Oxford)\, Fixed point properties and conformal dimension of the boundary for hyperbolic groups\n15.00- 15-45 Mathieu Dussaule (Nantes)\, The Guivarch inequality in relatively hyperbolic groups\n15.45-16.15 coffee break\,\n16.15-17.00 Anthony Genevois (Orsay)\, Cubical geometry of braided Thompson’s group URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes-6/ LOCATION:Salle W (Toits du DMA) CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20190312T140000 DTEND;TZID=Europe/Paris:20190312T170000 DTSTAMP:20260611T053507 CREATED:20190312T130000Z LAST-MODIFIED:20211104T112225Z UID:8498-1552399200-1552410000@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:14.00-14.45 Emmanuel Militon (Nice)\, Groups of diffeomorphisms of a Cantor set15.00-15.45 Simon André (Rennes)\, Hyperbolicity is preserved under elementary equivalence15.45-16.15 coffee break(CANCELED) 16.15-17.00 Nikolay Nikolov (Oxford)\, On conjugacy classes in compact groups URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes-4/ LOCATION:Salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20190212T140000 DTEND;TZID=Europe/Paris:20190212T170000 DTSTAMP:20260611T053507 CREATED:20190212T130000Z LAST-MODIFIED:20211104T112225Z UID:8499-1549980000-1549990800@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:14.00-14.45 Joshua Frisch (Caltech) Proximal actions\, Strong amenability\, and Infinite conjugacy class groups15.00-15.45 Andy Zucker (Paris VII) Bernoulli Disjointness15.45-16.15 coffee break16.15-17.00 Christophe Garban (Université Lyon 1) Inverted orbits of exclusion processes\, diffuse-extensive-amenability and (non-?)amenability of the interval exchanges URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes-5/ LOCATION:Salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20190122T140000 DTEND;TZID=Europe/Paris:20190122T170000 DTSTAMP:20260611T053507 CREATED:20190122T130000Z LAST-MODIFIED:20211104T111601Z UID:8486-1548165600-1548176400@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:Tuesday\, 22 January14.00-14.45 Bertrand Rémy (Ecole Polytechnique)15.00-15.45 Tom Hutchcroft (Cambridge)15.45-16.15 coffee break16.15-17.00 Pavel Zalesski (University of Brasilia)Bertrand Remy\, Quasi-isometric invariance of continuous group Lp-cohomology\, and first applications to vanishings (joint with Marc Bourdon)We show that the continuous L^p-cohomology of locally compact second countable groups is a quasi-isometric invariant. As an application\, we prove partial results supporting a positive answer to a question asked by M. Gromov\, suggesting a classical behaviour of continuous L^p-cohomology of simple real Lie groups. In addition to quasi-isometric invariance\, the ingredients are a spectral sequence argument and Pansu?RTMs vanishing results for real hyperbolic spaces. In the best adapted cases of simple Lie groups\, we obtain nearly half of the relevant vanishings. Tom Hutchcroft\, Kazhdan groups have cost 1I will sketch a proof that Kazhdan groups have cost 1\, answering a question of Gaboriau. No knowledge of Kazhdan groups or of cost will be assumed. Joint work with Gabor Pete.Pavel Zalesski\, The profinite completion of 3-manifold groups.Abstract. We shall present structural results of the profinite completion widehat G of a 3-manifold group G and its interrelation with the structure of G. We shall address the question to what extent the profinite completion of the fundamental group $pi_1M of a 3-manifold determines the manifold M and discuss residual properties of pi_1 M. URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes-3/ LOCATION:Salle W ENS CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20181211T140000 DTEND;TZID=Europe/Paris:20181211T170000 DTSTAMP:20260611T053507 CREATED:20181211T130000Z LAST-MODIFIED:20211104T111359Z UID:8479-1544536800-1544547600@www.math.ens.psl.eu SUMMARY:Après-midi de théorie de groupes DESCRIPTION:14.00-14.45 Dawid Kielak (Bielefeld)Fibring of residually finite rationally-solvable groups14.45 -15.15 coffee break15.15-16.00 Damian Osajda (Wroclaw and McGill\, Montreal)A combination theorem for combinatorially non-positively curved complxes of hyperbolic groups URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-de-groupes-2/ LOCATION:Salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20181113T140000 DTEND;TZID=Europe/Paris:20181113T140000 DTSTAMP:20260611T053507 CREATED:20181113T130000Z LAST-MODIFIED:20211104T111158Z UID:8474-1542117600-1542117600@www.math.ens.psl.eu SUMMARY:Après-midi de théorie de groupes DESCRIPTION:Tuesday\, 13 November14.00-14.45 Miklos Abert (Renyi Institute Budapest)15.00-15.45 Arman Darbinyan (ENS Paris)15.45-15.15 coffee break16.15-17.00 Rachel Skipper (Göttingen and ENS Lyon) URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-de-groupes/ LOCATION:Salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20181009T140000 DTEND;TZID=Europe/Paris:20181009T170000 DTSTAMP:20260611T053507 CREATED:20181009T120000Z LAST-MODIFIED:20211119T102754Z UID:8468-1539093600-1539104400@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:14.00-14.45 Martin Bridson (Oxford)\, Profinite rigidity and hyperbolic 3-orbifolds15.00-15.45 Arnaud Hilion (Marseille): Boundary of cyclic hyperbolic extensions of free groups15.45-16.15 pause café16.15-17.00 Damien Gaboriau (ENS Lyon)\, On non-vanishing of the cohomology of Aut(Fn) and Out(Fn) in top dimensions URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes-2/ LOCATION:ENS 45 rue d’Ulm salle W toits du DMA CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180626T140000 DTEND;TZID=Europe/Paris:20180626T180000 DTSTAMP:20260611T053507 CREATED:20180626T120000Z LAST-MODIFIED:20211104T110755Z UID:8464-1530021600-1530036000@www.math.ens.psl.eu SUMMARY:Après-midi de théorie des groupes DESCRIPTION:14.00-14.45 Pierre Pansu (Orsay) L^1 cohomology of Euclidean spaces andHeisenberg groups15.00-15.45  Tianyi Zhang  (UC San Diego) Growth of torsion Grigorchukgroups15.45-16.15 pause café16.15-17.00  Sergei Ivanov (St-Petersbourg)\, Transfinite invariants ofgroups and spaces17.15-18.00 Kate Juschenko (Northwestern University)\, On Liouvilleproperty of action of discrete groups URL:https://www.math.ens.psl.eu/evenement/apres-midi-de-theorie-des-groupes/ LOCATION:Institut Henri Poincaré (11 rue Pierre et Marie Curie 75005 Paris) salle 01 CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180515T140000 DTEND;TZID=Europe/Paris:20180515T170000 DTSTAMP:20260611T053507 CREATED:20180515T120000Z LAST-MODIFIED:20211104T110741Z UID:8462-1526392800-1526403600@www.math.ens.psl.eu SUMMARY:Mardi après-midi de théorie des groupes DESCRIPTION:14.00-14.45 Thomas Schick (Göttingen): Approximation of L2-Betti numbers and the algebraic Eigenvalue property (after Jaikin-Zaipirain)15.00-15.45 Jacques Darné (Lille): Variations autour du problème d’Andreadakis 15.45-16.15 pause café16.15-17.00 Volodymyr Nekrashevych (Texas A&M): Amenability of iterated monodromy groups URL:https://www.math.ens.psl.eu/evenement/mardi-apres-midi-de-theorie-des-groupes/ LOCATION:Salle W toits du DMA CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180417T140000 DTEND;TZID=Europe/Paris:20180417T170000 DTSTAMP:20260611T053507 CREATED:20180417T120000Z LAST-MODIFIED:20211104T110540Z UID:8456-1523973600-1523984400@www.math.ens.psl.eu SUMMARY:3 exposés de dynamique et théorie des groupes DESCRIPTION:14.00-14.45 Omer Tamuz (Caltech): The Poisson boundary and the infinite conjugacy class property15.00-15.45 Yair Hartman (Northwestern University): Stationary C*-Dynamical Systems15.45-16.15 pause café16.15-17.00 Said Sidki (University of Brasilia): Self-similarity and finite presentability URL:https://www.math.ens.psl.eu/evenement/3-exposes-de-dynamique-et-theorie-des-groupes-2/ LOCATION:Salle W toits du DMA ENS CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180313T000000 DTEND;TZID=Europe/Paris:20180313T000000 DTSTAMP:20260611T053507 CREATED:20180312T230000Z LAST-MODIFIED:20211104T110338Z UID:8450-1520899200-1520899200@www.math.ens.psl.eu SUMMARY:3 exposés de dynamique et théorie des groupes DESCRIPTION:14.00-14.45 Julien Cassaigne (IML\, Marseille): A family of infinite words with complexity 2n+1 associated with a bidimensional continued fraction algorithm15.00-15.45 Milton Minervino (LaBRI\, Bordeaux): Fractals de Rauzy et substitutions d’arbre15.45-16.15 coffee break16.45-17.00 Nathalie Aubrun (ENS\, Lyon): Tilings problems on substitution orbits URL:https://www.math.ens.psl.eu/evenement/3-exposes-de-dynamique-et-theorie-des-groupes/ LOCATION:Salle W toits du DMA CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180220T140000 DTEND;TZID=Europe/Paris:20180220T170000 DTSTAMP:20260611T053507 CREATED:20180220T130000Z LAST-MODIFIED:20211104T110338Z UID:8449-1519135200-1519146000@www.math.ens.psl.eu SUMMARY:Un après-midi de marches aléatoires sur les groupes DESCRIPTION:14.00-14.45 François Ledrappier (Paris VI)\, Differentiability of the linear drift in negative curvature15.00-15.45 Johannes Cuno (ENS)\, Random walks on Baumslag-Solitar groups15.45-16.15 pause café16.15-17.00 Ariel Yadin (Ben Gurion University)\, Intersectional IRS and Furstenberg entropy realization URL:https://www.math.ens.psl.eu/evenement/un-apres-midi-de-marches-aleatoires-sur-les-groupes/ LOCATION:Toits du DMA salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20180116T140000 DTEND;TZID=Europe/Paris:20180116T170000 DTSTAMP:20260611T053507 CREATED:20180116T130000Z LAST-MODIFIED:20211025T103312Z UID:8442-1516111200-1516122000@www.math.ens.psl.eu SUMMARY:Trois exposés dans un après-midi de théorie des groupes DESCRIPTION:https://sites.google.com/site/annaerschler/programtalks URL:https://www.math.ens.psl.eu/evenement/trois-exposes-dans-un-apres-midi-de-theorie-des-groupes-3/ LOCATION:14:00-17:00 Salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20171205T140000 DTEND;TZID=Europe/Paris:20171205T170000 DTSTAMP:20260611T053507 CREATED:20171205T130000Z LAST-MODIFIED:20211104T105553Z UID:8431-1512482400-1512493200@www.math.ens.psl.eu SUMMARY:un après-midi sur la theorie des groupes DESCRIPTION:14.00-14.45 Markus Steenbock (ENS) Product Set Growth in Hyperbolic Geometry(Salle W)15.00-15.45 Dominik Francoeur (ENS) On maximal subgroups in branch groups. (Salle W)15.45-16.15 coffee break16.45-17.00 Feyishayo Olukoya (St-Andrews) The growth rates of groups generated by reset automata (Salle Cartan)Des détails se trouvent à https://sites.google.com/site/annaerschler/programtalks. URL:https://www.math.ens.psl.eu/evenement/un-apres-midi-sur-la-theorie-des-groupes/ CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20171114T140000 DTEND;TZID=Europe/Paris:20171114T170000 DTSTAMP:20260611T053507 CREATED:20171114T130000Z LAST-MODIFIED:20211104T105551Z UID:8429-1510668000-1510678800@www.math.ens.psl.eu SUMMARY:Trois exposés de théorie des groupes : Mikhailov / Levitt / Mitrofanov DESCRIPTION:14.00-14.45 Roman Mikhailov (St.Petersburg): Around nilpotent completion.15.00-15.45 Gilbert Levitt (Caen): On elementary equivalence of hyperbolic groups.15.45-16.15 coffee break16.15-17.00 Ivan Mitrofanov (ENS): Algorithmic problems for self-similar groups. URL:https://www.math.ens.psl.eu/evenement/trois-exposes-de-theorie-des-groupes-mikhailov-levitt-mitrofanov/ LOCATION:Salle W toits du DMA Ecole Normale Superieure 45 rue d’Ulm Paris 5e CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20171017T000000 DTEND;TZID=Europe/Paris:20171017T000000 DTSTAMP:20260611T053507 CREATED:20171016T220000Z LAST-MODIFIED:20211104T125954Z UID:8428-1508198400-1508198400@www.math.ens.psl.eu SUMMARY:Trois exposés dans un après-midi de théorie des groupes DESCRIPTION: URL:https://www.math.ens.psl.eu/evenement/trois-exposes-dans-un-apres-midi-de-theorie-des-groupes-2/ LOCATION:Salle W Salle H.Cartan CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20170523T140000 DTEND;TZID=Europe/Paris:20170523T170000 DTSTAMP:20260611T053507 CREATED:20170523T120000Z LAST-MODIFIED:20211104T104311Z UID:8389-1495548000-1495558800@www.math.ens.psl.eu SUMMARY:Trois exposés dans un après-midi de théorie des groupes DESCRIPTION: URL:https://www.math.ens.psl.eu/evenement/trois-exposes-dans-un-apres-midi-de-theorie-des-groupes/ LOCATION:Salle W DMA ENS CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20170404T140000 DTEND;TZID=Europe/Paris:20170404T170000 DTSTAMP:20260611T053507 CREATED:20170404T120000Z LAST-MODIFIED:20211104T104240Z UID:8377-1491314400-1491325200@www.math.ens.psl.eu SUMMARY:trois exposés en théorie des groupes DESCRIPTION:https://sites.google.com/site/annaerschler/programtalks URL:https://www.math.ens.psl.eu/evenement/trois-exposes-en-theorie-des-groupes-2/ LOCATION:Salle W DMA ENS CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20170321T140000 DTEND;TZID=Europe/Paris:20170321T170000 DTSTAMP:20260611T053507 CREATED:20170321T130000Z LAST-MODIFIED:20211104T104202Z UID:8372-1490104800-1490115600@www.math.ens.psl.eu SUMMARY:Trois exposés en théorie des groupes DESCRIPTION:14.00-14.45 Camille Horbez (Orsay): Boundary amenability of Out(Fn)15.00-15.45 Romain Tessera (Orsay): Poincaré profile in Hyperbolic groups15.45-16.15 pause café16.15-17.00 Yash Lodha (EPFL Lausanne): Nonamenable groups of piecewise projective homeomorphisms URL:https://www.math.ens.psl.eu/evenement/trois-exposes-en-theorie-des-groupes/ LOCATION:ENS Toits du DMA salle W CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20170221T140000 DTEND;TZID=Europe/Paris:20170221T180000 DTSTAMP:20260611T053507 CREATED:20170221T130000Z LAST-MODIFIED:20211104T103801Z UID:8363-1487685600-1487700000@www.math.ens.psl.eu SUMMARY:Quatre exposés en théorie des groupes DESCRIPTION: URL:https://www.math.ens.psl.eu/evenement/quatre-exposes-en-theorie-des-groupes/ LOCATION:ENS 45 rue d’Ulm salle W (toits du DMA) CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20170124T140000 DTEND;TZID=Europe/Paris:20170124T170000 DTSTAMP:20260611T053507 CREATED:20170124T130000Z LAST-MODIFIED:20211104T102527Z UID:8338-1485266400-1485277200@www.math.ens.psl.eu SUMMARY:La propriété (T) et ses généralisations DESCRIPTION:14.00-14.45 Marc Bourdon (Lille) : Espaces hyperboliques\, dimension conforme et cohomologie $ell _p$15.00-15.45 Masato Mimura (EPFL Lausanne) : Superintrinsic synthesis in fixed point properties15.45-16.15 pause café16.15-17.00 Mikael De La Salle (ENS Lyon) : Zuk’s criterion for actions on Banach spaces URL:https://www.math.ens.psl.eu/evenement/la-propriete-t-et-ses-generalisations/ LOCATION:ENS Salle W (Toits du DMA) CATEGORIES:Séminaire de théorie des groupes à l’ENS END:VEVENT END:VCALENDAR