4 papers
math.DG2005
The structure of CR manifolds
Aristide Tsemo
In this paper we study the topology of pseudo convex CR manifolds whose Reeb flow preserves the Levi metric.
math.CT2005
Quadratic categories, Koszul resolutions and operads
Aristide Tsemo
A quadratic algebra is a homogeneous algebra generated by its elements of degree 1. Manin has endowed the category of quadratic algebras with two tensor products. These structures…
math.DG2005
Gerbes, 2-gerbes and symplectic fibrations
Tsemo Aristide
Let (F,u)\to P\to N be a symplectic fibration in math.SG/0503268 McDuff has defined a subgroup Ham^s(F,u) of the group of symplectic automorphisms of(F,u). She has shown that the c…
math.DG2005
Connective structure for principal gerbes
Tsemo Aristide
In this paper we generalize the notion of connective structure defined by Pierre Deligne to gerbes bounded by the automorphisms group of a principal bundle.