On the discriminant of the Artin component
On the discriminant variety of a projective manifold.
On the distribution of rational points on certain Kummer surfaces
On the Donaldson polynomials of elliptic surfaces.
On the Enriques classification of algebraic surfaces
On the existence of components of the Noether-Lefschetz Locus with given codiemsnion.
on the existence of stable rank-2 sheaves on algebraic surfaces
On the extendability of elliptic surfaces of rank two and higher
We study threefolds having as hyperplane section a smooth surface with an elliptic fibration. We first give a general theorem about the possible embeddings of such surfaces with Picard number two. More precise results are then proved for Weierstrass fibrations, both of rank two and higher. In particular we prove that a Weierstrass fibration of rank two that is not a K3 surface is not hyperplane section of a locally complete intersection threefold and we give some conditions, for many embeddings...
On the Failure of Variational Torelli for Regular Elliptic Surfaces with a Section.
On the finiteness of rational curves on quintic threefolds
On the fixed part of certain linear systems on surfaces
On the Fundamental Group of a Unirational 3-Fold.
On the Fundamental Group of the Space of Cubic Surfaces.
On the fundamental groups of some open rational surfaces.
On the genus of reducible surfaces and degenerations of surfaces
We deal with a reducible projective surface with so-called Zappatic singularities, which are a generalization of normal crossings. First we compute the -genus of , i.e. the dimension of the vector space of global sections of the dualizing sheaf . Then we prove that, when is smoothable, i.e. when is the central fibre of a flat family parametrized by a disc, with smooth general fibre, then the -genus of the fibres of is constant.
On the Genus of Varieties of Codimension 2 in Projective Space.
On the Geography of Surfaces. Simply Connected Minimal Surfaces with Positive Index.
On the Geometry of a Siegel Modular Threefold.
On the geometry of a special determinantal hypersurface associated to the Mumford-Horrocks vector bundle.
On the geometry of null cones in Einstein-vacuum spacetimes