Existence et equidistribution des matrices de denominateur n dans les groupes unitaires et orthogonaux

Details Existence et equidistribution des matrices de denominateur n dans les groupes unitaires et orthogonaux Existence et equidistribution des matrices de denominateur n dans les groupes unitaires et orthogonaux

2007-09-17

arxiv.org/abs/0709.2603v1

Mathematics

Number Theory

French

Scientific paper

We study some subsets of rational points in an algebraic groups defined by open conditions on their projection in the finite adeles points. Using adelic mixing we are able to prove an equidistribution's result for the projection of these sets in the real points. As an application, we study the existence and the repartition of rational unitary matrices having a given denominator. We prove a local-global principle for this problem and the equirepartition of the sets of denominator n-matrices when they are not empty. Then we study the more complicated case of non simply-connected groups applying it to quadratic forms.

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