Marc Hindry, Bruno Kahn, Wieslawa Niziol, Cathy Swaenepoel
Email des responsables :
cathy.swaenepoel@imj-prg.fr
Salle :
Adresse :
Description
http://www.imj-prg.fr/tn/STN/stnj.html
Orateur(s)
G. Shimura - ,
Titre
Quadratic Diophantine equations and class numbers
Date
10/05/2004
Horaire
14:00 à 16:00
Diffusion
Résume
Gauss showed that the number of primitive representations ofan integer as sums of 3 squares is a simple factor times the classnumber of binary forms of a fixed discriminant. We present a generalprinciple on a quadratic form of $n$ variables that connectsa primitive representation of an integer by the form to aclass of an orthogonal group in dimension $n-1$. The case of 3 squaresis an easiest example.