Qregularity and tensor products of vector bundles on smooth quadric hypersurfaces.
Quadratic Equations over Finite Fields and Class Numbers of Real Quadratic Fields.
Quantum Cohomology and Periods
In a previous paper, the author introduced an integral structure in quantum cohomology defined by the -theory and the Gamma class and showed that it is compatible with mirror symmetry for toric orbifolds. Applying the quantum Lefschetz principle to the previous results, we find an explicit relationship between solutions to the quantum differential equation of toric complete intersections and the periods (or oscillatory integrals) of their mirrors. We describe in detail the mirror isomorphism of...
Quartic del Pezzo surfaces over function fields of curves
We classify quartic del Pezzo surface fibrations over the projective line via numerical invariants, giving explicit examples for small values of the invariants. For generic such fibrations, we describe explicitly the geometry of spaces of sections to the fibration, and mappings to the intermediate Jacobian of the total space. We exhibit examples where these are birational, which has applications to arithmetic questions, especially over finite fields.
Quartic surfaces with 16 skew conics.
Quartic threefolds containing two skew double lines
Quasi-elliptic surfaces in characteristic three
Quasi-Gorenstein Fano 3-folds with isolated non-rational loci
Quasihomogene isolierte Singularitäten von Hyperflächen.
Quasihomogeneous Singularities.
Quasi-lines and their degenerations
In this paper we study the structure of manifolds that contain a quasi-line and give some evidence towards the fact that the irreducible components of degenerations of the quasi-line should determine the Mori cone. We show that the minimality with respect to a quasi-line yields strong restrictions on fibre space structures of the manifold.
Quasi-projective quotients by compact equivalence relations.
Quelques plongements projectifs non speciaux de surfaces rationnelles.
Quelques propriétés arithmétiques des surfaces rationnelles (d'après Manin)
Quelques résultats de Corrado Segre sur les surfaces réglées.
Quintic surfaces of having a non singular model with