Descente fidèlement plate pour les n-champs d’Artin

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-...

Induction interactive d'extracteurs n-aires pour les documents semi-structurés

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 ...

Analyse structurelle des champs de capacité d'action dans les organisations sociales Outils analytiques pour la caractérisation de la coopération

In this article, we present a set of analytical tools aimed at clarifying some simulation results of social actors behaviors in social organizations. These tools are used within a meta-model of social organizations structure, which is the result of a formalization of the Sociology of Organized Action theory. Following this formalization, the structure of a social organization is depicted by som...

Un Modèle multidimensionnel pour l'analyse en ligne des champs continus

Résumé. L'intégration des données spatiales dans les modèles multidimensionnels conduit au concept d'OLAP Spatial (SOLAP). Les modèles SOLAP existants exploitent les données spatiales vectorielles. Peu de travaux intègrent les données spatiales continues (champs continus) en dimension et en mesure. Dans ce papier, nous proposons un modèle multidimensionnel qui utilise les champs continus comme ...