String theory and duality.
Structure des surfaces de Kato
Structures de Poisson sur les variétés algébriques de dimension trois
Subsheaves of the cotangent bundle
For any smooth projective variety, we study a birational invariant, defined by Campana which depends on the Kodaira dimension of the subsheaves of the cotangent bundle of the variety and its exterior powers. We provide new bounds for a related invariant in any dimension and in particular we show that it is equal to the Kodaira dimension of the variety, in dimension up to 4, if this is not negative.
Subvarieties of generic complete intersections. II.
Subvarieties of Segre varieties and trisecant lines.
Subvarieties of semiabelian varieties
Sui monoidi di ordine quattro di singolari in codimensione uno
Sul massimo numero di punti doppi isolati di una superficie algebrica di
Sulla seminormalità delle superficie algebriche
Sulle ipersuperficie generate dalla Jacobiana di un sistema lineare di quadriche.
Superfici algebriche con curve canoniche
Supersingular surfaces
Supersingular K 3 surfaces with big Artin invariant.
Sur des variétés de Moishezon dont le groupe de Picard est de rang un
Sur la classification de germes d'applications holomorphes contractantes.
Sur la monodromie des singularités isolées d'hypersurfaces complexes
Sur la structure du groupe d'automorphismes de certaines surfaces affines.
We describe the structure of the group of algebraic automorphisms of the following surfaces 1) P1,k x P1,k minus a diagonal; 2) P1,k x P1,k minus a fiber. The motivation is to get a new proof of two theorems proven respectively by L. Makar-Limanov and H. Nagao. We also discuss the structure of the semi-group of polynomial proper maps from C2 to C2.
Sur la structure locale des variétés sphériques
Sur la topologie des surfaces affines réglées