La classe des morphismes de Dwyer n'est pas stable par rétractes
Lax -categories and directed homotopy
Lax operad actions and coherence for monoidal -categories, rings and modules.
Le localisateur fondamental minimal
LVMB manifolds and simplicial spheres
LVM and LVMB manifolds are a large family of non kähler manifolds. For instance, Hopf manifolds and Calabi-Eckmann manifolds can be seen as LVMB manifolds. The LVM manifolds have a natural action of a real torus and the quotient of this action is a polytope. This quotient allows us to relate closely LVM manifolds to the moment-angle manifolds studied by Buchstaber and Panov. Our aim is to generalize the polytope associated to a LVM manifold to the LVMB case and study the properties of this generalization....