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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:20160327T010000
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TZOFFSETFROM:+0200
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DTSTART:20161030T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20160513T110000
DTEND;TZID=Europe/Paris:20160513T110000
DTSTAMP:20260415T080232
CREATED:20160513T090000Z
LAST-MODIFIED:20211104T100810Z
UID:8279-1463137200-1463137200@www.math.ens.psl.eu
SUMMARY:Non-standard fewnomials
DESCRIPTION:Call non-standard fewnomial (or sparse/lacunary polynomial) a non-standard polynomial whose number of non-zero terms is finite. The non-standard translation of a conjecture of Rényi and Erdöt
URL:https://www.math.ens.psl.eu/evenement/non-standard-fewnomials/
LOCATION:Salle W ENS
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20160513T141500
DTEND;TZID=Europe/Paris:20160513T141500
DTSTAMP:20260415T080232
CREATED:20160513T121500Z
LAST-MODIFIED:20211104T100811Z
UID:8280-1463148900-1463148900@www.math.ens.psl.eu
SUMMARY:Profinite NIP groups
DESCRIPTION:We consider profinite groups as 2-sorted first order structures\, with a group sort\, and a second sort which acts as an index set for a uniformly definable basis of neighbourhoods of the identity. It is shown that if the basis consists of all open subgroups\, then the first order theory of such a structure is NIP (that is\, does not have the independence property) precisely if the group has a normal subgroup of finite index which is a direct product of finitely many compact p-adic analytic groups\, for distinct primes p. In fact\, the condition NIP can here be weakened to NTP2.We also show that any NIP profinite group\, presented as a 2-sorted structure\, has an open prosoluble normal subgroup.(Joint work with Dugald Macpherson)
URL:https://www.math.ens.psl.eu/evenement/profinite-nip-groups/
LOCATION:Salle W ENS
CATEGORIES:Séminaire Géométrie et théorie des modèles
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20160513T160000
DTEND;TZID=Europe/Paris:20160513T160000
DTSTAMP:20260415T080232
CREATED:20160513T140000Z
LAST-MODIFIED:20211104T100811Z
UID:8281-1463155200-1463155200@www.math.ens.psl.eu
SUMMARY:Wave front sets of distributions in non-archimedean analysis
DESCRIPTION:In 1969\, Sato and Hörmander introduced the notion of wave front set of a distribution in the real context. This concept gives a better understanding of operations on distributions such as product or pullback and it plays an important role in the theory of partial differential equations. In 1981\, Howe introduced a notion of wave front set for some Lie group representations and in 1985\, Heifetz gave an analogous version in the p-adic context. In this talk\, in the t-adic context in characteristic zero\, using Cluckers-Loeser motivic integration we will present analogous constructions of test functions\, distributions and wave front sets. In particular\, we will explain how definability can be used as a substitute for topological compactness of the sphere in the real and p-adic contexts to obtain finiteness.This a joint work with R. Cluckers\, and F. Loeser.
URL:https://www.math.ens.psl.eu/evenement/wave-front-sets-of-distributions-in-non-archimedean-analysis/
LOCATION:Salle W ENS
CATEGORIES:Séminaire Géométrie et théorie des modèles
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