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arXiv 1407.6329math.COcs.ITmath.IT
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Doob图中的完美码

Perfect codes in Doob graphs

Denis Krotov

摘要:

研究了Doob图$D(m,n)$中的$1$ -完美码.证明了$GR(4^2)$上线性码存在的充要条件是对某些整数$g \ge 0$和$d>0$,$n=(4^{g+d}-1)/3$和$m=(4^{g+2d}-4^{g+d})/6$是线性码.我们还证明了必要条件$(m,n)$的$1$ -完美的代码是线性的$Z_4$(我们称这种代码添加剂)存在于$D(m,n)$图,对于这些参数中的一些,我们显示的代码的存在。对于满足$2m+n=(4^t-1)/3$和$m \le (4^t-5\cdot 2^{t-1}+1)/9$的$m$和$n$,我们证明了在$D(m,n)$中存在$1$ -完美码,而不受允许某种群结构的限制.关键词:完美码,Doob图,距离正则图。

英文摘要:

We study $1$-perfect codes in Doob graphs $D(m,n)$. We show that such codes that are linear over $GR(4^2)$ exist if and only if $n=(4^{g+d}-1)/3$ and $m=(4^{g+2d}-4^{g+d})/6$ for some integers $g \ge 0$ and $d>0$. We also prove necessary conditions on $(m,n)$ for $1$-perfect codes that are linear over $Z_4$ (we call such codes additive) to exist in $D(m,n)$ graphs; for some of these parameters, we show the existence of codes. For every $m$ and $n$ satisfying $2m+n=(4^t-1)/3$ and $m \le (4^t-5\cdot 2^{t-1}+1)/9$, we prove the existence of $1$-perfect codes in $D(m,n)$, without the restriction to admit some group structure. Keywords: perfect codes, Doob graphs, distance regular graphs.

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