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arXiv 2107.09758math.CO
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正则图的有效(j,k)-控制

Efficient (j,k)-Domination in Regular Graphs

Brendan Rooney

摘要:

Rubalcaba和Slater(Robert R. Rubalcaba和Peter J. Slater.有效(j,k)-控制Discuss.图论,27(3):409-423,2007)。将图$X$上的$(j,k)$ -支配函数定义为函数$f:V(X)\rightarrow \{0,\ldots,j\}$,使得对于每个$v\in V(X)$,$f(N[v])\geq k$,其中$N[v]$是$v$的闭邻域。这样的函数是有效的,如果所有的顶点不等式满足相等。他们给出了有效控制的一个简单的必要条件,即:如果$X$是一个$n$顶点上的$r$ -正则图,且它有一个有效的$(1,k)$ -控制函数,则相应的控制集的大小整除$n\cdot k$ .汉明图$H(q,d)$是向量$\mathbb{Z}_q^d$上的图,其中两个向量相邻当且仅当它们在汉明距离$1$处。我们证明了,如果$q$是素数,那么前面的必要条件是足够的$H(q,d)$有一个有效的$(1,k)$ -支配功能。这个结果推广了Lee(Jaeun Lee. Cayley图的独立完美控制集。图论,37(4):213-219,2001)。Cayley图的独立完美控制我们提到了当$q$是素数幂但不是素数时$H(q,d)$出现的困难。

英文摘要:

Rubalcaba and Slater (Robert R. Rubalcaba and Peter J. Slater. Efficient (j,k)-domination. Discuss. Math. Graph Theory, 27(3):409-423, 2007.) define a $(j,k)$-dominating function on graph $X$ as a function $f:V(X)\rightarrow \{0,\ldots,j\}$ so that for each $v\in V(X)$, $f(N[v])\geq k$, where $N[v]$ is the closed neighbourhood of $v$. Such a function is efficient if all of the vertex inequalities are met with equality. They give a simple necessary condition for efficient domination, namely: if $X$ is an $r$-regular graph on $n$ vertices that has an efficient $(1,k)$-dominating function, then the size of the corresponding dominating set divides $n\cdot k$. The Hamming graph $H(q,d)$ is the graph on the vectors $\mathbb{Z}_q^d$ where two vectors are adjacent if and only if they are at Hamming distance $1$. We show that if $q$ is prime, then the previous necessary condition is sufficient for $H(q,d)$ to have an efficient $(1,k)$-dominating function. This result extends a result of Lee (Jaeun Lee. Independent perfect domination sets in Cayley graphs. J. Graph Theory, 37(4):213-219, 2001.) on independent perfect domination in Cayley graphs. We mention difficulties that arise for $H(q,d)$ when $q$ is a prime power but not prime.

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