Cet article énumère les réseaux entiers unimodulaires de dimension , vus comme -voisins de . La première partie contient les informations nécessaires pour lire et pour travailler avec les tables. Elle ne contient aucune preuve. La deuxième partie est formée de tables qui contiennent les données numériques pour les réseaux unimodulaires entiers indécomposable de dimension . Un appendice esquisse les preuves des énoncés.
Under the assumption that the ternary form x² + 2y² + 5z² + xz represents all odd positive integers, we prove that a ternary quadratic form ax² + by² + cz² (a,b,c ∈ ℕ) represents all positive integers n ≡ 4(mod 8) if and only if it represents the eight integers 4,12,20,28,52,60,140 and 308.
We consider the Legendre quadratic formsand, in particular, a question posed by J–P. Serre, to count the number of pairs of integers , for which the form has a non-trivial rational zero. Under certain mild conditions on the integers , we are able to find the asymptotic formula for the number of such forms.
Let be a unitary group defined over a non-Archimedean local field of odd residue characteristic and let be the centralizer of a semisimple rational Lie algebra element of We prove that the Bruhat-Tits building of can be affinely and -equivariantly embedded in the Bruhat-Tits building of so that the Moy-Prasad filtrations are preserved. The latter property forces uniqueness in the following way. Let and be maps from to which preserve the Moy–Prasad filtrations. We prove that...
We give non-trivial upper bounds for the number of integral solutions, of given size, of a system of two quadratic form equations in five variables.