Une des fonctions systèmes d’information géographique (SIG) en archéologie est la modélisation, avec pour objectif de proposer une hypothèse spatiale plutôt que données brutes. Cette contribution présente conception, les résultats et limites d’un SIG modélisation appliqué à l’occupation rurale Somme l’époque romaine. Il s’agit ici d’en délimiter paramètres d’emplacement originels, c’est-à-dire ...

To every matroid, we associate a class in the K-theory of the Grassmannian. We study this class using the method of equivariant localization. In particular, we provide a geometric interpretation of the Tutte polynomial. We also extend results of the second author concerning the behavior of such classes under direct sum, series and parallel connection and two-sum; these results were previously o...

We expose a rule for multiplying a general Schubert polynomial with a power sum polynomial in k variables. A signed sum over cyclic permutations replaces the signed sum over rim hooks in the classical Murgnahan– Nakayama rule. In the intersection theory of flag manifolds this computes all intersections of Schubert cycles with tautological classes coming from the Chern character. We also discuss...