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X-ORIGINAL-URL:https://www.math.ens.psl.eu
X-WR-CALDESC:évènements pour Département de mathématiques et applications
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TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20180325T010000
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BEGIN:STANDARD
TZOFFSETFROM:+0200
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DTSTART:20181028T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180306T180000
DTEND;TZID=Europe/Paris:20180306T200000
DTSTAMP:20260408T135435
CREATED:20180306T170000Z
LAST-MODIFIED:20211104T104947Z
UID:8416-1520359200-1520366400@www.math.ens.psl.eu
SUMMARY:Titre à définir
DESCRIPTION:
URL:https://www.math.ens.psl.eu/evenement/titre-a-definir/
CATEGORIES:Lectures grothendieckiennes
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180307T170000
DTEND;TZID=Europe/Paris:20180307T170000
DTSTAMP:20260408T135435
CREATED:20180307T160000Z
LAST-MODIFIED:20211028T085532Z
UID:8894-1520442000-1520442000@www.math.ens.psl.eu
SUMMARY:Une introduction au chaos quantique.
DESCRIPTION:Il y a cent ans\, pendant la préhistoire de la mécanique quantique\, se posait la question de trouver des conditions de quantification pour décrire le spectre des atomes. Einstein en particulier s’est interrogé sur la quantification des systèmes qui ont la propriété d’ergodicité en mécanique classique. Nous ferons le point sur les principales conjectures liées à cette question\, et décrirons quelques résultats récents\, en insistant plus particulièrement sur la propriété appelée ergodicité quantique.
URL:https://www.math.ens.psl.eu/evenement/une-introduction-au-chaos-quantique/
LOCATION:ENS (amphithéâtre Galois sous la bibliothèque de mathématique)
CATEGORIES:ANNÉE 2017-2018,Archives Séminaire « Des mathématiques »,Séminaire Des mathématiques
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180309T150000
DTEND;TZID=Europe/Paris:20180309T160000
DTSTAMP:20260408T135435
CREATED:20180309T140000Z
LAST-MODIFIED:20211104T110339Z
UID:8451-1520607600-1520611200@www.math.ens.psl.eu
SUMMARY:Introduction aux espaces de Berkovich
DESCRIPTION:Il s’agira d’un exposé de survol de la théorie des espaces de Berkovich\, préparatoire à l’exposé suivant.
URL:https://www.math.ens.psl.eu/evenement/introduction-aux-espaces-de-berkovich/
LOCATION:ENS Salle W
CATEGORIES:Variétés rationnelles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180309T163000
DTEND;TZID=Europe/Paris:20180309T173000
DTSTAMP:20260408T135435
CREATED:20180309T153000Z
LAST-MODIFIED:20211104T110339Z
UID:8452-1520613000-1520616600@www.math.ens.psl.eu
SUMMARY:Recollement sur les courbes de Berkovich et principe local-global
DESCRIPTION:Le recollement a été introduit dans un cadre géométrique pour traiter le problème inverse de Galois. Par la suite\, la technique a été adaptée à un contexte plus algébrique par Harbater et Hartmann\, puis développée par Harbater\, Hartmann et Krashen. Nous commencerons par présenter une version de cette méthode sur les courbes de Berkovich. Ensuite\, nous l’utiliserons pour démontrer un résultat local-global sur les corps de fonctions de courbes de Berkovich et finirons en expliquant l’application aux formes quadratiques. Nos résultats généralisent ceux de Harbater\, Hartmann et Krashen.
URL:https://www.math.ens.psl.eu/evenement/recollement-sur-les-courbes-de-berkovich-et-principe-local-global/
LOCATION:ENS Salle W
CATEGORIES:Variétés rationnelles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180313T000000
DTEND;TZID=Europe/Paris:20180313T000000
DTSTAMP:20260408T135435
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:20180313T093000
DTEND;TZID=Europe/Paris:20180313T123000
DTSTAMP:20260408T135435
CREATED:20180313T083000Z
LAST-MODIFIED:20211104T104327Z
UID:8396-1520933400-1520944200@www.math.ens.psl.eu
SUMMARY:A préciser
DESCRIPTION:A venir
URL:https://www.math.ens.psl.eu/evenement/a-preciser-5/
LOCATION:Univ. Pierre et Marie Curie salle du séminaire LJLL
CATEGORIES:Séminaire Analyse non linéaire et EDP
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180323T110000
DTEND;TZID=Europe/Paris:20180323T110000
DTSTAMP:20260408T135435
CREATED:20180323T100000Z
LAST-MODIFIED:20211104T110539Z
UID:8454-1521802800-1521802800@www.math.ens.psl.eu
SUMMARY:On a conjecture of Colliot-Thélène
DESCRIPTION:Let f be a morphism of projective smooth varieties X\, Y defined over the rationals. The conjecture by Colliot-Thélène under discussion gives (conjectural) sufficient conditions which imply that for almost all rational prime numbers p\, the map f maps the p-adic points X(Q_p) surjectively onto Y(Q_p). The aim of the talk is to present some recent results by Denef\, Skorobogatov et al
URL:https://www.math.ens.psl.eu/evenement/on-a-conjecture-of-colliot-thelene/
LOCATION:IHP amphitheatre Darboux
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180323T141500
DTEND;TZID=Europe/Paris:20180323T154500
DTSTAMP:20260408T135435
CREATED:20180323T131500Z
LAST-MODIFIED:20211104T110538Z
UID:8453-1521814500-1521819900@www.math.ens.psl.eu
SUMMARY:The dynamical Mordell-Lang problem in positive characteristic
DESCRIPTION:The dynamical Mordell-Lang conjecture in characteristic zero predicts that if f : X –> X is a map of algebraic varieties over a field K of characteristic zero\, Y subset X is a closed subvariety and a in X(K) is a K-rational point on X\, then the return set { n in N : f^n(a) in Y(K) } is a finite union of points and arithmetic progressions. For K a field of characteristic p > 0\, it is necessary to allow for finite unions with sets of the form { a + sum_{i=1}^m p^{n_i} : (n_1\, … \, n_m) in N^m } and one might conjecture that all return sets are finite unions of points\, arithmetic progressions and such p-sets. We studied the special case of the positive characteristic dynamical Mordell-Lang problem on semiabelian varieites and using our earlier results with Moosa on so-called F-sets reduced the problem to that of solving a class of exponential diophantine equations in characteristic zero. In so doing\, under the hypothesis that X is a semiabelian variety and either Y has small dimension or f is sufficiently general\, we prove the conjecture. However\, we also show that our reduction to the exponential diiophantine problems may be reversed so that the positive characteristic dynamical Mordell-Lang conjecture in general is equivalent to a class of hard exponential diophantine problems which the experts consider to be out of reach given our present techniques. (This is a report on joint work with Pietro Corvaja\, Dragos Ghioca and Umberto Zannier available at arXiv:1802.05309.)
URL:https://www.math.ens.psl.eu/evenement/the-dynamical-mordell-lang-problem-in-positive-characteristic/
LOCATION:IHP amphitheatre Darboux
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180323T160000
DTEND;TZID=Europe/Paris:20180323T173000
DTSTAMP:20260408T135435
CREATED:20180323T150000Z
LAST-MODIFIED:20211104T110539Z
UID:8455-1521820800-1521826200@www.math.ens.psl.eu
SUMMARY:A model theoretic generalization of the one-dimensional case of the Elekes-Szabo theorem
DESCRIPTION:(Joint work with A. Chernikov)Let V subseteq C^3 be a complex variety of dimension 2.The Elekes-Szabo Theorem says that if V contains `too many’ points on n x n x n Cartesian products then V has a special form: either V contains a cylinder over a curve or V is related to the graph of the multiplication of an algebraic group.In this talk we generalize the Elekes-Szabo Theorem to relations on strongly minimal sets interpretable in distal structures.
URL:https://www.math.ens.psl.eu/evenement/a-model-theoretic-generalization-of-the-one-dimensional-case-of-the-elekes-szabo-theorem/
LOCATION:IHP amphitheatre Darboux
CATEGORIES:Séminaire Géométrie et théorie des modèles
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