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X-WR-CALNAME:Département de mathématiques et applications
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
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TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20190331T010000
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TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20191027T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190312T140000
DTEND;TZID=Europe/Paris:20190312T153000
DTSTAMP:20260409T095755
CREATED:20190312T130000Z
LAST-MODIFIED:20211104T112226Z
UID:8500-1552399200-1552404600@www.math.ens.psl.eu
SUMMARY:Strongly NIP almost real closed fields
DESCRIPTION:The following conjecture is due to Shelah–Hasson: Any infinite strongly NIP field is either real closed\, algebraically closed\, or admits a non-trivial definable henselian valuation\, in the language of rings. We specialise this conjecture to ordered fields in the language of ordered rings\, which leads towards a systematic study of the class of strongly NIP almost real closed fields. As a result\, we obtain a complete characterisation of this class.
URL:https://www.math.ens.psl.eu/evenement/strongly-nip-almost-real-closed-fields/
LOCATION:Sophie Germain salle 1016
CATEGORIES:Théorie des Modèles et Groupes
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190312T140000
DTEND;TZID=Europe/Paris:20190312T170000
DTSTAMP:20260409T095755
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:20190312T160000
DTEND;TZID=Europe/Paris:20190312T173000
DTSTAMP:20260409T095755
CREATED:20190312T150000Z
LAST-MODIFIED:20211104T112241Z
UID:8503-1552406400-1552411800@www.math.ens.psl.eu
SUMMARY:Density of compressiblity in NIP theories
DESCRIPTION:Joint with Itay Kaplan and Pierre Simon.Distal theories are NIP theories which are ?Roewholly unstable?R. Chernikov and Simon’s ?Roestrong honest definitions?R characterise distal theories as those in which every type is compressible. Adapting recent work in machine learning of Chen\, Cheng\, and Tang on bounds on the ?Roerecursive teaching dimension?R of a finite concept class\, we find that compressibility is dense in NIP structures\, i.e. any formula can be completed to a compressible type in S(A). Considering compressibility as an isolation notion (which specialises to l-isolation in stable theories)\, we obtain consequences on the existence of models with certain properties.
URL:https://www.math.ens.psl.eu/evenement/density-of-compressiblity-in-nip-theories/
LOCATION:Sophie Germain salle 2015
CATEGORIES:Théorie des Modèles et Groupes
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190319T160000
DTEND;TZID=Europe/Paris:20190319T173000
DTSTAMP:20260409T095755
CREATED:20190319T150000Z
LAST-MODIFIED:20211104T112241Z
UID:8504-1553011200-1553016600@www.math.ens.psl.eu
SUMMARY:The word and conjugacy problems in finitely generated groups
DESCRIPTION:The word and conjugacy problems are central decision problems associated with finitely generated groups. In particular\, there are deep results which bridge some of the main concepts of the theories of computability and computational complexity with group theoretical invariants through the word problem in groups. In this talk I will recall some of the well-known facts about the word and conjugacy problems in groups as well as discuss new results concerning the relationship between them.
URL:https://www.math.ens.psl.eu/evenement/the-word-and-conjugacy-problems-in-finitely-generated-groups/
LOCATION:Sophie Germain salle 2015
CATEGORIES:Théorie des Modèles et Groupes
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190322T000000
DTEND;TZID=Europe/Paris:20190322T000000
DTSTAMP:20260409T095755
CREATED:20190321T230000Z
LAST-MODIFIED:20211104T112226Z
UID:8501-1553212800-1553212800@www.math.ens.psl.eu
SUMMARY:Independence of CM points in elliptic curves
DESCRIPTION:I will speak about joint work with Jacob Tsimerman. Let E be an elliptic curve parameterized by a modular (or Shimura) curve. There are a number of results (…\, Buium-Poonen\, Kuhne) to the effect that the images of CM points are (under suitable hypotheses) linearly independent in E. We consider this issue in the setting of the Zilber-Pink conjecture and prove a result which improves previous results in some aspects
URL:https://www.math.ens.psl.eu/evenement/independence-of-cm-points-in-elliptic-curves/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190322T000000
DTEND;TZID=Europe/Paris:20190322T000000
DTSTAMP:20260409T095755
CREATED:20190321T230000Z
LAST-MODIFIED:20211104T112227Z
UID:8502-1553212800-1553212800@www.math.ens.psl.eu
SUMMARY:Counting rational points with the determinant method
DESCRIPTION:The determinant method gives upper bounds for the number of rational points of bounded height on or near algebraic varieties defined over global fields. There is a real-analytic version of the method due to Bombieri and Pila and a p-adic version due to Heath-Brown. The aim of our talk is to describe a global refinement of the p-adic method and some applications like a uniform bound for non-singular cubic curves which improves upon earlier bounds of Ellenberg-Venkatesh and Heath-Brown.
URL:https://www.math.ens.psl.eu/evenement/counting-rational-points-with-the-determinant-method/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190322T160000
DTEND;TZID=Europe/Paris:20190322T173000
DTSTAMP:20260409T095755
CREATED:20190322T150000Z
LAST-MODIFIED:20211104T141546Z
UID:8505-1553270400-1553275800@www.math.ens.psl.eu
SUMMARY:Patching over Berkovich Curves
DESCRIPTION:Patching was first introduced as an approach to the Inverse Galois Problem. The technique was then extended to a more algebraic setting and used to prove a local-global principle by D. Harbater\, J. Hartmann and D. Krashen. I will present an adaptation of the method of patching to the setting of Berkovich analytic curves. This will then be used to prove a local-global principle for function fields of curves that generalizes that of the above mentioned authors.
URL:https://www.math.ens.psl.eu/evenement/patching-over-berkovich-curves/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
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