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Representations of finite number of quadratic forms with same rank
The Ramanujan Journal ( IF 0.6 ) Pub Date : 2020-10-27 , DOI: 10.1007/s11139-020-00314-6
Daejun Kim , Byeong-Kweon Oh

Let mn be positive integers with \(m\le n\). Let \(\kappa (m,n)\) be the largest integer k such that for any (positive definite and integral) quadratic forms \(f_1,\ldots ,f_k\) of rank m, there exists a quadratic form of rank n that represents \(f_i\) for any i with \(1\le i \le k\). In this article, we determine the number \(\kappa (m,n)\) for any integer m with \(1\le m\le 8\), except for the cases when \((m,n)=(3,5)\) and (4, 6). In the exceptional cases, it will be proved that \(1\le \kappa (3,5), \kappa (4,6)\le 2\). We also discuss some related topics.



中文翻译:

具有相同秩的有限数量的二次形式的表示

m,  n为带有\(m \ le n \)的正整数。令\(\ kappa(m,n)\)为最大整数k,使得对于秩m的任何(正定和整数)二次形式\(f_1,\ ldots,f_k \),存在秩的二次形式ñ表示\(f_i \)对于任何\(1 \文件I \文件ķ\) 。在本文中,我们确定任何带有\(1 \ le m \ le 8 \)的整数m的数字\ {\ kappa(m,n)\),除非\ {{m,n} = { 3,5)\)和(4,6)。在特殊情况下,将证明\(1 \ le \ kappa(3,5),\ kappa(4,6)\ le 2 \)。我们还将讨论一些相关主题。

更新日期:2020-10-30
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