Set-theoretic generation of ideals
Singularities of theta divisors and the geometry of
We study the codimension two locus in consisting of principally polarized abelian varieties whose theta divisor has a singularity that is not an ordinary double point. We compute the class for every . For , this turns out to be the locus of Jacobians with a vanishing theta-null. For , via the Prym map we show that has two components, both unirational, which we describe completely. We then determine the slope of the effective cone of and show that the component of the Andreotti-Mayer...
Smooth global complete intersections in certain compact homogenous complex manifolds.
Smooth non-special surfaces of P4.
Smooth quartic surfaces with 352 conics.
Some properties of stable rank 2 bundles on algebraic surfaces.
Some recent results on surfaces of general type
Spectral curves and integrable systems
Stability of Irrational Ruled Threefolds.
Stability of Two-Dimensional Local Rings. I.
Stable 2-Bundles on Hirzebruch Surfaces.
Stable bundles on blown up surfaces.
Stable bundles on regular elliptic surfaces.
Structures de Poisson sur les variétés algébriques de dimension trois
Subvarieties of semiabelian varieties
Sui monoidi di ordine quattro di singolari in codimensione uno
Sur l’espace de modules des faisceaux semi stables de rang 2, de classes de Chern (0,3) sur
L’espace de modules des faisceaux semi-stables de rang 2, de classes de Chern (0,3) sur le plan projectif est une variété projective irréductible et lisse de dimension 9. Dans , les points qui ne proviennent pas d’un faisceau localement libre constituent une hypersurface . Dans cet article, nous montrons que toute surface complété de rencontre la frontière , autrement dit qu’il n’existe pas de famille de fibrés vectoriels paramétrée par une surface complète de . La démonstration repose...
Surfaces de Del Pezzo : II - Éclater points dans
Surfaces de Del Pezzo : III - Positions presque générales
Surfaces de Del Pezzo : IV - Systèmes anticanoniques