A characterization of ample vector bundles on a curve.
A characterziation of IPn by vector bundles.
A Class of Indecomposable Algebraic Vector Bundles.
A class of n-bundles on Gr (k, n).
A Cohomological Characterization of IPn.
A Comparison Theorem.
A computer aided approach to codimension 2 subvarities of Pn, n ... 6.
A Construction of Surfaces with pg = 1, q = 0 and 2...(K2) ...8. Counter Examples of the Global Torelli Theorem.
A converse to the Andreotti-Grauert theorem
The goal of this paper is to show that there are strong relations between certain Monge-Ampère integrals appearing in holomorphic Morse inequalities, and asymptotic cohomology estimates for tensor powers of holomorphic line bundles. Especially, we prove that these relations hold without restriction for projective surfaces, and in the special case of the volume, i.e. of asymptotic -cohomology, for all projective manifolds. These results can be seen as a partial converse to the Andreotti-Grauert...
A Criterion for the Canonical Bundle of a 3-Fold to be Amble.
A Criterion for the Splitting of a Vector Bundle.
A criterion for virtual global generation
Let be a smooth projective curve defined over an algebraically closed field , and let denote the absolute Frobenius morphism of when the characteristic of is positive. A vector bundle over is called virtually globally generated if its pull back, by some finite morphism to from some smooth projective curve, is generated by its global sections. We prove the following. If the characteristic of is positive, a vector bundle over is virtually globally generated if and only if for...
A criterion of openness of a family of nef line bundles.
A curve of genus with a Half-Canonical embedding in
Si costruiscono curve di genere , che hanno fasci semicanonici tali che . Per si dimostra che gli sono molto ampi.
A Decomposability Criterion for Algebraic 2-Bundles on Projective Spaces.
A Decomposition Theorem for the Integral Homology of a Variety.
A description of Chern classes of semistable sheaves on a quadric surface.
A duality result for moduli spaces of semistable sheaves supported on projective curves
A duality theorem for Dieudonné displays
We show that the Zink equivalence between -divisible groups and Dieudonné displays over a complete local ring with perfect residue field of characteristic is compatible with duality. The proof relies on a new explicit formula for the -divisible group associated to a Dieudonné display.
A few remarks on blowing-up and connectedness.