Formes normales pour les champs conformes pseudo-riemanniens

Descente pour les n-champs

We develop the theory of n-stacks (or more generally Segal n-stacks which are∞-stacks such that the morphisms are invertible above degree n). This is done by systematically using the theory of closed model categories (cmc). Our main results are: a definition of n-stacks in terms of limits, which should be perfectly general for stacks of any type of objects; several other characterizations of n-...

Unique normal forms for the Takens–Bogdanov singularity in a special case

We consider further reduction of normal forms for nilpotent planar vector fields. We give a unique normal form for a special case of an open problem for the Takens–Bogdanov singularity.  2001 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS Unicité des formes normales pour la singularité de Takens–Bogdanov dans un cas particulier Résumé. On étudie l’unicité des formes nor...

Médecine factuelle et recommandations de bonne pratique : une extension du modèle classique pour expliquer les décisions médicales non conformes

A Joint Framework for Disparity and Surface Normal Estimation

This paper deals with the stereo matching problem, while moving away from the traditional fronto-parallel assumption. We propose an algorithm that provides disparities in accordance with the surface properties of the scene under consideration. To do so, we carry out cooperatively both disparity and surface normal estimations by setting the two tasks in a unified Markovian framework. A novel joi...

Toposes pour les nuls

The \generalized universe of sets" aspect of toposes is relatively easy to understand and is well documented in the literature: start with Goldblatt [1] and proceed via Mac Lane and Moerdijk [5], or MacLarty [4], to Johnstone [2]. The basic trick is to use categorical properties to characterize set-theoretic constructions in the category of sets, and thence to transfer them to other categories ...