A Poncelet theorem in space.
A priori bounds of Castelnuovo type for cohomological Hilbert functions.
A problem of Kollár and Larsen on finite linear groups and crepant resolutions
The notion of age of elements of complex linear groups was introduced by M. Reid and is of importance in algebraic geometry, in particular in the study of crepant resolutions and of quotients of Calabi–Yau varieties. In this paper, we solve a problem raised by J. Kollár and M. Larsen on the structure of finite irreducible linear groups generated by elements of age . More generally, we bound the dimension of finite irreducible linear groups generated by elements of bounded deviation. As a consequence...
A problem on coefficient fields and equations over local rings
A procedure to calcute torsion of elliptic curves over Q.
A product formula for period integrals.
A proof of Noether's formula for the arithmetic genus of an algebraic surface
A proof of the birationality of certain BHK-mirrors
We generalize and give an elementary proof of Kelly’s refinement [9] of Shoemaker’s result [11] on the birationality of certain BHK-mirrors. Our approach uses a construction that is equivalent to the Krawitz generalization [10] of the duality in Berglund-Hübsch [2].
A proof of the stratified Morse inequalities for singular complex algebraic curves using the Witten deformation
The Witten deformation is an analytic method proposed by Witten which, given a Morse function on a smooth compact manifold , allows to prove the Morse inequalities. The aim of this article is to generalise the Witten deformation to stratified Morse functions (in the sense of stratified Morse theory as developed by Goresky and MacPherson) on a singular complex algebraic curve. In a previous article the author developed the Witten deformation for the model of an algebraic curve with cone-like singularities...
A proof of the valuation property and preparation theorem
The purpose of this article is to present a short model-theoretic proof of the valuation property for a polynomially bounded o-minimal theory T. The valuation property was conjectured by van den Dries, and proved for the polynomially bounded case by van den Dries-Speissegger and for the power bounded case by Tyne. Our proof uses the transfer principle for the theory (i.e. T with an extra unary symbol denoting a proper convex subring), which-together with quantifier elimination-is due to van den...
À propos de G. A. G. R.
A propos de l' espace des modules de fibrés de rang 2 sur une courbe.
À propos de la conjecture de Manin pour les courbes elliptiques modulaires
À propos de la construction de l'espace de modules des faisceaux semi-stables sur le plan projectif
À propos de la forme hermitienne canonique d'une singularité isolée d'hypersurface
À propos de l'existence de fibrés stables sur les surfaces.
A propos du problème des arcs de Nash
Soit la décomposition canonique de l’espace des arcs passant par une singularité normale de surface. Dans cet article, on propose deux nouvelles conditions qui si elles sont vérifiées permettent de montrer que n’est pas inclus dans . On applique ces conditions pour donner deux nouvelles preuves du problème de Nash pour les singularités sandwich minimales.
À propos du théorème de Belyi
Le théorème de Belyi affirme que sur toute courbe algébrique lisse projective et géométriquement connexe, définie sur , il existe une fonction non ramifiée en dehors de . Nous montrons que cette fonction peut être choisie sans automorphismes, c’est-à-dire telle que pour tout automorphisme non trivial de , on ait . Nous en déduisons que si est une extension finie de , toute -classe d’isomorphisme de courbes algébriques lisses projectives géométriquement connexes peut être caractérisée...
A propos d'une conjecture arithmétique sur le groupe de Chow d'une surface rationnelle
A quantitative version of Siegel's theorem: integral points on elliptic curves and Catalan curves.