On the principal bundles over a flag manifold.
On the projective normality of the adjunction bundles.
On the rationality of the moduli schemes of vector bundles on curves
On the Real Points of an Arithmetic Quotient of a Bounded Symmetrie Domain.
On the sectional irregularity of congruences.
On the Shintani zeta function for the space of binary quadratic forms.
On the smallest degree of a surface containing a space curve
Sia una curva dello spazio di grado contenuta in una superficie di grado e non in una di grado . Se è integra, allora ; questo limite superiore, raggiunto in alcuni casi (cfr. [5]), non vale però per curve arbitrarie (cfr. [?, 3 (iii)]). Ogni curva dello spazio (anche non ridotta o riducibile) può essere ottenuta come schema degli zero di una sezione non nulla di un opportuno fascio riflessivo di rango 2. Mediante i fasci riflessivi, siamo in grado di estendere alle curve riducibili...
On the space curves with the same image under the Gauss maps.
On the stability of subgroup actions on certain quasihomogeneous -varieties.
On the structure of certain normal ideals
On the structure of linked 3-folds.
The structure of 3-folds in P6 which are generally linked via a complete intersection (f1,f2,f3) to 3-folds in P6 of degree d ≤ 5 is determined. We also give three new examples of smooth 3-folds in P6 of degree 11 and genus 9. These examples are obtained via liaison. The first two are 3-folds linked via a complete intersection (2,3,3) to 3-folds in P6 of degree 7: (i) the hyperquadric fibration over P1 and (ii) the scroll over P2. The third example is Pfaffian linked to a 3-dimensional quadric in...
On the vanishing of Hochschild homology of locally complete intersections.
On the variational Torelli problem for complete intersections
On the Varieties Parametrizing Rational Space Curves with Fixed Normal Bundle.
On the zeta function of monodromy of a polynomial map
On twisted exponential sums.
On Unirationality of Supersingular Surfaces.
On Zariski's theorem in positive characteristic
In the current paper we show that the dimension of a family of irreducible reduced curves in a given ample linear system on a toric surface over an algebraically closed field is bounded from above by , where denotes a general curve in the family. This result generalizes a famous theorem of Zariski to the case of positive characteristic. We also explore new phenomena that occur in positive characteristic: We show that the equality does not imply the nodality of even if belongs to the...
On zero-dimensional subschemes of a complete intersections.
Operateurs differentiels de Shimura et espaces prehomogenes.