|
Class numbers in the genus of quadratic forms, and algebraic groups
A. S. Rapinchuk
Abstract:
In this paper the class numbers $c(f)$ of quadratic forms $f$ with coefficients in an algebraic number field $K$ are studied by the methods of the theory of algebraic groups. It is shown that if a form $f$ is positive definite, then for any natural number $r$ there exists a quadratic form $g_r$, $K$-equivalent to $f$, such that $c(g_r)$ is divisible by $r$. A generalization of this result to semisimple algebraic $K$-groups of compact type is also obtained.
Bibliography: 21 titles.
Received: 01.04.1981
Citation:
A. S. Rapinchuk, “Class numbers in the genus of quadratic forms, and algebraic groups”, Math. USSR-Izv., 19:1 (1982), 79–93
Linking options:
https://www.mathnet.ru/eng/im1585https://doi.org/10.1070/IM1982v019n01ABEH001412 https://www.mathnet.ru/eng/im/v45/i4/p775
|
|