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X-WR-CALDESC:Évènements pour Laboratoire de Mathématiques de Versailles
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260505T133000
DTEND;TZID=Europe/Paris:20260505T140000
DTSTAMP:20260512T002931
CREATED:20260430T161305Z
LAST-MODIFIED:20260507T114022Z
UID:15005-1777987800-1777989600@lmv.math.cnrs.fr
SUMMARY:AG : Lucas Pannier (LMV) : An effective proof of the p-curvature conjecture for first-order differential equations with rational coefficients
DESCRIPTION:Abstract: In 1974\, Honda proved the p-curvature conjecture for order one differential equations with rational coefficients over a number field. He demonstrated that in this setting\, the p-curvature conjecture was equivalent to a theorem due to Kronecker\, providing a local-global criterion for the splitting of polynomials over the rational numbers. In 1985 the Chudnovskys published another proof of Honda’s theorem (and of Kronecker’s theorem) by means of Padé approximation and elementary number theory\, thus paving the way to an effective version of these results. Here\, by « effective » we mean that we wish to obtain an explicit finite bound on the number of p-curvatures to be computed in order to decide the algebraicity of the solution of the differential equation. \nIn this talk\, I will explain how to obtain such a bound. \nThis is joint work with Florian Fürnsinn (University of Vienna).
URL:https://lmv.math.cnrs.fr/evenenement/ag-lucas-pannier-lmv-an-effective-proof-of-the-p-curvature-conjecture-for-first-order-differential-equations-with-rational-coefficients/
CATEGORIES:Séminaire AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260505T140000
DTEND;TZID=Europe/Paris:20260505T143000
DTSTAMP:20260512T002931
CREATED:20260430T161917Z
LAST-MODIFIED:20260507T114028Z
UID:15007-1777989600-1777991400@lmv.math.cnrs.fr
SUMMARY:AG : Davide Ricci (LMV) : The Mori cone of certain Hassett spaces
DESCRIPTION:Abstract: The talk will introduce the F-conjecture\, which states that the Mori cone of the moduli space of genus g stable curves ‾Mg\,n is generated by 1-dimensional strata. We will see that the question can be formulated on any Hassett space and has a positive answer when the universal family is a P1-bundle. In particular\, we review how these particular Hassett spaces are naturally isomorphic to certain GIT quotients (P1)n // PGL2\, and we characterize these spaces as the targets of the birational contractions of Bln-1Pn-3 with Q-factorial image.
URL:https://lmv.math.cnrs.fr/evenenement/ag-davide-ricci-lmv-the-mori-cone-of-certain-hassett-spaces/
CATEGORIES:Séminaire AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260519T133000
DTEND;TZID=Europe/Paris:20260519T143000
DTSTAMP:20260512T002931
CREATED:20260302T163943Z
LAST-MODIFIED:20260507T114054Z
UID:14829-1779197400-1779201000@lmv.math.cnrs.fr
SUMMARY:AG : Bernhard Keller (IMJ-PRG)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/ag-bernhard-keller-imj-prg/
CATEGORIES:Séminaire AG
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260521T140000
DTEND;TZID=Europe/Paris:20260521T150000
DTSTAMP:20260512T002931
CREATED:20260308T171641Z
LAST-MODIFIED:20260511T133220Z
UID:14846-1779372000-1779375600@lmv.math.cnrs.fr
SUMMARY:EDP : Daniel Han-Kwan (université de Nantes et CNRS) : Limite semiclassique de NLS cubique pour les états mixtes
DESCRIPTION:Résumé :\nOn considère la limite semiclassique de l’équation de Schrödinger cubique pour les états mixtes. La limite formelle est une équation de Vlasov singulière (Vlasov-Benney dans le cas défocalisant).\nCette limite est justifiée pour des données initiales à régularité finie\, vérifiant une condition de stabilité de type Penrose. \nIl s’agit d’une collaboration avec Frédéric Rousset (Orsay).
URL:https://lmv.math.cnrs.fr/evenenement/edp-daniel-han-kwan-universite-de-nantes-et-cnrs/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260521T153000
DTEND;TZID=Europe/Paris:20260521T163000
DTSTAMP:20260512T002931
CREATED:20260308T171802Z
LAST-MODIFIED:20260511T114105Z
UID:14848-1779377400-1779381000@lmv.math.cnrs.fr
SUMMARY:EDP : Philippe Souplet (université Sorbonne Paris Nord) : Classification of entire and ancient solutions of the diffusive Hamilton-Jacobi equation
DESCRIPTION:Abstract: (joint work with Loth Chabi) We study the Liouville type classification and symmetry properties\,\nin \(R^n\) and in a half-space with Dirichlet boundary conditions\, for entire and ancient solutions of the diffusive Hamilton-Jacobi equation\,\nwhich arises in optimal stochastic control\, in KPZ type models of surface growth and in studies of boundary gradient blow-up. \nIn particular we obtain optimal Liouville type theorems for ancient and entire solutions in \(R^n\) and we completely classify entire solutions in a half-space.\nThe proofs rely\, among other things\, on new and optimal\, local estimates of Bernstein and Li-Yau type.\nSuch Liouville type results are very useful in the qualitative analysis of blow-up singularities for this equation.
URL:https://lmv.math.cnrs.fr/evenenement/edp-philippe-souplet-universite-sorbonne-paris-nord/
LOCATION:Bâtiment Fermat\, salle 4205
CATEGORIES:Séminaire EDP
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260526T133000
DTEND;TZID=Europe/Paris:20260526T143000
DTSTAMP:20260512T002931
CREATED:20260305T161023Z
LAST-MODIFIED:20260305T161023Z
UID:14833-1779802200-1779805800@lmv.math.cnrs.fr
SUMMARY:AG : Sophie Morier-Genoud (Université de Reims)
DESCRIPTION:
URL:https://lmv.math.cnrs.fr/evenenement/ag-sophie-morier-genoud-universite-de-reims/
CATEGORIES:Séminaire AG
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