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arXiv 0801.3394math.CO
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具有大禁止子群的半正则相对差集

Semi-regular Relative Difference Sets with Large Forbidden Subgroups

Tao Feng, Qing Xiang

摘要:

受半正则相对差集与互无偏基之间联系的启发,研究了非素幂序群中带参数$(m,n,m,m/n)$的相对差集.设PDMATHAMN是一个奇素数。证明了在任意阶$2p^2$的群中不存在$(2p,p,2p,2)$相对差集,而交换的$(4p,p,4p,4)$相对差集只能存在于群$\Bbb{Z}_2^2\times \Bbb{Z}_3^2$中.另一方面,我们构造了一类以$(4q,q,4q,4)$为参数的非交换相对差集,其中$q$是大于9的奇素数幂,且$q\equiv 1$(mod 4).当$q=p$是素数,$p>9$和$p\equiv$ 1(mod 4)时,这里构造的$(4p,p,4p,4)$非阿贝尔相对差集在不存在具有相同参数的阿贝尔相对差集的意义上是真正的非阿贝尔相对差集.

英文摘要:

Motivated by a connection between semi-regular relative difference sets and mutually unbiased bases, we study relative difference sets with parameters $(m,n,m,m/n)$ in groups of non-prime-power orders. Let $p$ be an odd prime. We prove that there does not exist a $(2p,p,2p,2)$ relative difference set in any group of order $2p^2$, and an abelian $(4p,p,4p,4)$ relative difference set can only exist in the group $\Bbb{Z}_2^2\times \Bbb{Z}_3^2$. On the other hand, we construct a family of non-abelian relative difference sets with parameters $(4q,q,4q,4)$, where $q$ is an odd prime power greater than 9 and $q\equiv 1$ (mod 4). When $q=p$ is a prime, $p>9$, and $p\equiv$ 1 (mod 4), the $(4p,p,4p,4)$ non-abelian relative difference sets constructed here are genuinely non-abelian in the sense that there does not exist an abelian relative difference set with the same parameters.

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