Charakteristiken und Schnittzahlformeln für p-l-s-Kegelschnitte
Closures of SL(2)-Orbits in Projective Spaces.
Combinatoire des arbres planaires et arithmétique des courbes hyperelliptiques
Le but de cet article est de proposer une nouvelle méthode pour des études dans le cadre de la théorie des “dessins d’enfants” de A. Grothendieck de certaines questions concernant l’action du groupe de Galois absolu sur l’ensemble des arbres planaires.On définit l’application qui associe à chaque arbre planaire à arêtes, une courbe hyperelliptique avec un point de -division. Cette construction permet d’établir un lien entre la théorie de la torsion des courbes hyperelliptiques et celle des “dessins...
Combinatorial aspects of the sequence of Milnor numbers of deformations
We use combinatorics to describe the topology of a singular irreducible plane curve germ f = 0 under small perturbation of parameters.
Combinatories and intersections of Schubert varieties.
Complete Collineations and Blowing upDeterminantal Ideals.
Complete cubics in enumerative geometry
Completion of the variety of conics with respect to contact conditions II
Completion of the variety of conics with respect to contract conditions I
Configuration space of 8 points on the projective line and a 5-dimensional Picard modular group
Configurations of Kodaira fibers on rational elliptic surfaces.
Configurations of lines and general hyperplane sections.
Conic sections in space defined by intersection conditions.
Conics in characteristic 2
Contact Conditions on Conic Varieties and Halphen's 2nd Formula
Contribution des droites d'une surface à ses multisécantes
Counting lines on surfaces
This paper deals with surfaces with many lines. It is well-known that a cubic contains of them and that the maximal number for a quartic is . In higher degree the question remains open. Here we study classical and new constructions of surfaces with high number of lines. We obtain a symmetric octic with lines, and give examples of surfaces of degree containing a sequence of skew lines.
Counting points of small height on elliptic curves
Counting rational curves of arbitrary shape in projective spaces.
Courbes de l'espace projectif: Séries linéaires incomplètes et multisécantes.