Perfect codes in circulant graphs

Perfect codes in circulant graphs
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循环图中的完美代码

DOI:
10.1016/j.disc.2017.02.007
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发表时间:
2017-03
影响因子:
0.8
通讯作者:
Zhou Sanming
Zhou Sanming
中科院分区:
数学3区
文献类型:
--
作者:
Feng Rongquan;Huang He;Zhou Sanming

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图Γ=(V,E)中的完美码是V的一个子集C,它是一个独立集,使得V <$C中的每个顶点都恰好与C中的一个顶点相邻。Γ中的全完美码是V的子集C,使得V的每个顶点恰好与C中的一个顶点相邻。汉明图H(n,q)中的完美码与经典情形下长度为n的q元完美1-码一致。本文给出了p-1度循环图存在完美码的一个充要条件,其中p是奇素数。我们还得到了一个n阶和度为pl − 1的循环图有完美码的充要条件,其中p是素数,pl是p除n的最大幂。对于完全完美码也得到了类似的结果。
A perfect code in a graph Γ=(V, E) is a subset C of V that is an independent set such that every vertex in V∖ C is adjacent to exactly one vertex in C. A total perfect code in Γ is a subset C of V such that every vertex of V is adjacent to exactly one vertex in C. A perfect code in the Hamming graph H (n, q) agrees with a q-ary perfect 1-code of length n in the classical setting. In this paper we give a necessary and sufficient condition for a circulant graph of degree p− 1 to admit a perfect code, where p is an odd prime. We also obtain a necessary and sufficient condition for a circulant graph of order n and degree p l− 1 to have a perfect code, where p is a prime and p l the largest power of p dividing n. Similar results for total perfect codes are also obtained in the paper.
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