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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:20150329T010000
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TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20151025T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20150522T110000
DTEND;TZID=Europe/Paris:20150522T110000
DTSTAMP:20260418T164558
CREATED:20150522T090000Z
LAST-MODIFIED:20211104T095553Z
UID:8218-1432292400-1432292400@www.math.ens.psl.eu
SUMMARY:Voisinages formels dans le schéma des arcs
DESCRIPTION:Je décrirai quelques investigations récentes autour du théorème deDrinfeld-Grinberg-Kahzdan sur le voisinage formel d’un arc nonsingulier. C’est un travail en commun avec Julien Sebag.
URL:https://www.math.ens.psl.eu/evenement/voisinages-formels-dans-le-schema-des-arcs/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20150522T141500
DTEND;TZID=Europe/Paris:20150522T141500
DTSTAMP:20260418T164558
CREATED:20150522T121500Z
LAST-MODIFIED:20211104T095554Z
UID:8219-1432304100-1432304100@www.math.ens.psl.eu
SUMMARY:On the existential theory of equicharacteristic henselian valued fields
DESCRIPTION:The first order theory of a henselian valued field of residue characteristic zero is well-understood through the celebrated Ax-Kochen-Ershov principle\, which states that it is completely determined by the theory of the residue field and the theory of the value group. For henselian valued fields of positive residue characteristic\, no such general principle is known. I will report on joint work with Will Anscombe in which we study (parts of) the theory of equicharacteristic henselian valued fields and prove an Ax-Kochen-Ershov principle for existential (and slightly more general) sentences. I will also discuss applications to the definability of henselian valuation rings and to the existential decidability (Hilbert’s tenth problem) of the local field F_q((t))\, which was proven by Denef and Schoutens assuming resolution of singularities.
URL:https://www.math.ens.psl.eu/evenement/on-the-existential-theory-of-equicharacteristic-henselian-valued-fields/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20150522T160000
DTEND;TZID=Europe/Paris:20150522T160000
DTSTAMP:20260418T164558
CREATED:20150522T140000Z
LAST-MODIFIED:20211104T095554Z
UID:8220-1432310400-1432310400@www.math.ens.psl.eu
SUMMARY:Around the Canonical Base Property
DESCRIPTION:The canonical base property (CBP) is a property of finite rank theories\, which was introduced by Pillay and whose formulation was motivated by results of Campana in complex geometry. The main feature of such a property is that it provides a dichotomy for types of rank one\, and in consequence one can reproduce Hrushovski’s proof of Mordell-Lang for function fields in characteristic zero with considerable simplifications.In this talk\, I will motivate (via Mordell-Lang) the statement of the CBP and describe some results around the CBP\, in particular on definable groups.
URL:https://www.math.ens.psl.eu/evenement/around-the-canonical-base-property/
LOCATION:ENS Salle W
CATEGORIES:Séminaire Géométrie et théorie des modèles
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