On Fano 4-folds of index 1 and homogeneous vector bundles over Grassmannians.
On hypersurface quotient singularities of dimension 4.
On numerically effective log canonical divisors.
On representation varieties of Artin groups, projective arrangements and the fundamental groups of smooth complex algebraic varieties
On the (-1)-curve conjecture of Friedmann and Morgan.
On two conjectures of Hartshorne's.
Small contractions of four dimensional algebraic manifolds.
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...
Some topological conditions for projective algebraic manifolds with degenerate dual varieties: connections with -bundles
Si illustrano alcune relazioni tra le varietà proiettive complesse con duale degenere, le varietà la cui topologia si riflette in quella della sezione iperpiana in misura maggiore dell'ordinario e le varietà fibrate in spazi lineari su di una curva.
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.
The cylinder homomorphism associated to quintic fourfolds
The dual of the invariant quintic.
The irregularity of ruled surfaces in three dimensional projective space.
Let S be a ruled surface in P3 with no multiple generators. Let d and q be nonnegative integers. In this paper we determine which pairs (d,q) correspond to the degree and irregularity of a ruled surface, by considering these surfaces as curves in a smooth quadric hypersurface in P5.
Theoreme de Torelli pour les cubiques de P5 .
Theta constants of genus three
Theta functions and cycles on some abelian fourfolds.
Une variété de dimension 4 avec forme d'intersection paire et signature - 8.
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Varietà di Fano di dimensione > e di indice >
Varieties whose hyperplane section are bundles