Smooth contractible hypersurfaces in Cn and exotic algebraic structures on C3.
Smooth double subvarieties on singular varieties, III
Let k be an algebraically closed field, char k = 0. Let C be an irreducible nonsingular curve such that rC = S ∩ F, r ∈ ℕ, where S and F are two surfaces and all the singularities of F are of the form , s ∈ ℕ. We prove that C can never pass through such kind of singularities of a surface, unless r = 3a, a ∈ ℕ. We study multiplicity-r structures on varieties r ∈ ℕ. Let Z be a reduced irreducible nonsingular (n-1)-dimensional variety such that rZ = X ∩ F, where X is a normal n-fold, F is a (N-1)-fold...
Smooth projective varieties dominated by smooth quadric hypersurfaces in any characteristic.
Sur le lieu de Noether-Lefschetz en degrés 6 et 7
Sur les espaces de modules des fibrés vectoriels de rang deux sur des hypersurfaces de P3.
Sur les zéro-cycles de certaines hypersurfaces munies d'un automorphisme