Non-smoothable varieties.
Nonstandard arithmetic of function fields over H-convex subfields of *Q.
Normal bundle to curves in quadrics
Normal degenerations of the complex projective plane.
Normal factorization in and the confluence of singular fibers in elliptic fibrations.
Normal projective degenerations of rational and ruled surfaces.
Normal projective surfaces with
Normal surface singularities admitting contracting automorphisms
We show that a complex normal surface singularity admitting a contracting automorphism is necessarily quasihomogeneous. We also describe the geometry of a compact complex surface arising as the orbit space of such a contracting automorphism.
Normal Surface Singularities with C* Action.
Normalformen für Flächen 3. Ordnung
Note sur la théorie de surfaces réciproques
Note sur les surfaces du quatrième ordre
Note sur les surfaces du quatrième ordre
Note über die acht Schnittpunkte dreier Oberflächen zweiter Ordnung.
Notes on the arithmetic of Fano threefolds
Notes on Varieties of Codimension 3 in Pn.
Nouvelles approches du «théorème» de Fermat
Nouvelles surfaces à noeuds dans IP3.
Numerical Campedelli surfaces with fundamental group of order 9
We give explicit constructions of all the numerical Campedelli surfaces, i.e. the minimal surfaces of general type with and , whose fundamental group has order 9. There are three families, one with and two with . We also determine the base locus of the bicanonical system of these surfaces. It turns out that for the surfaces with and for one of the families of surfaces with the base locus consists of two points. To our knowlegde, these are the only known examples of surfaces of general...
Numerical characterization of nef arithmetic divisors on arithmetic surfaces
In this paper, we give a numerical characterization of nef arithmetic -Cartier divisors of -type on an arithmetic surface. Namely an arithmetic -Cartier divisor of -type is nef if and only if is pseudo-effective and .