arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0601118math.CO
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可补图的亚纯性

Hypomorphy of graphs up to complementation

Jamel Dammak, Gérard Lopez, Maurice Pouzet, Hamza Si Kaddour

摘要:

令$V$是基数集$v$(可能是无限的)。如果$G'$同构于$G$或$G$的补图$\bar G$,则两个顶点集为$V$的图$G$和$G'$是{ \it同构到补}.设$k$是一个非负整数,$G$和$G'$是{ \it $k$ -亚同构直到互补},如果对于$V$的每个$k$ -元素子集$K$,导出子图$G\_{\restriction K}$和$G'\_{\restriction K}$同构直到互补.一个图$G$是{ \it $k$ -reconstructible up to complementation},如果每个图$G'$,它是$k$ -hypomorphic到$G$,直到complementation,实际上同构于$G$,直到complementation。我们给出了对$(n,k)$的集合$\mathcal S$的一个部分特征,使得在同一个$n$顶点集合上的两个图$G$和$G'$在互补之前是相等的,只要它们是$k$ -亚纯的.我们证明,特别是$\mathcal S$包含所有对$(n,k)$,使$4\leq k\leq n-4$。我们还证明了4是最小整数$k$,使得每个具有大量$n$顶点的图$G$是$k$ -可重构的,直到互补;这回答了P. Ille提出的问题

英文摘要:

Let $V$ be a set of cardinality $v$ (possibly infinite). Two graphs $G$ and $G'$ with vertex set $V$ are {\it isomorphic up to complementation} if $G'$ is isomorphic to $G$ or to the complement $\bar G$ of $G$. Let $k$ be a non-negative integer, $G$ and $G'$ are {\it $k$-hypomorphic up to complementation} if for every $k$-element subset $K$ of $V$, the induced subgraphs $G\_{\restriction K}$ and $G'\_{\restriction K}$ are isomorphic up to complementation. A graph $G$ is {\it $k$-reconstructible up to complementation} if every graph $G'$ which is $k$-hypomorphic to $G$ up to complementation is in fact isomorphic to $G$ up to complementation. We give a partial characterisation of the set $\mathcal S$ of pairs $(n,k)$ such that two graphs $G$ and $G'$ on the same set of $n$ vertices are equal up to complementation whenever they are $k$-hypomorphic up to complementation. We prove in particular that $\mathcal S$ contains all pairs $(n,k)$ such that $4\leq k\leq n-4$. We also prove that 4 is the least integer $k$ such that every graph $G$ having a large number $n$ of vertices is $k$-reconstructible up to complementation; this answers a question raised by P. Ille

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