On positive definite quadratic forms

Authors
Citation
De. Freeman, On positive definite quadratic forms, FORUM MATH, 12(5), 2000, pp. 603-647
Citations number
15
Categorie Soggetti
Mathematics
Journal title
FORUM MATHEMATICUM
ISSN journal
09337741 → ACNP
Volume
12
Issue
5
Year of publication
2000
Pages
603 - 647
Database
ISI
SICI code
0933-7741(2000)12:5<603:OPDQF>2.0.ZU;2-2
Abstract
We consider real positive definite quadratic forms Q(x) with algebraic coef ficients. Suppose that the ratios of the coefficients of Q(x) are not all r ational. It is shown that there is a number so such that if s greater than or equal to s(0), then for any positive epsilon there is a number M-o(epsil on) such that for all M greater than or equal to M-0(epsilon), there exists an integral vector x with \ Q(x) - M \ < epsilon. That is, the gaps betwee n values of such a form at integral points tend to zero as the values tend to infinity. In fact we may take s(0) = 416. We note that the author has re cently discovered that a stronger result than this has been given by other workers, but proved with a different method.