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arXiv 1305.0505math.COcs.DM
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关于k-可见度图

On k-visibility graphs

Matthew Babbitt, J. T. Geneson, Tanya Khovanova

摘要:

我们研究了几种类型的可见性图,其中视线可以通过$k$对象。对于$k \geq 1$,我们将半条$k$ -可见性图的最大厚度限制在$\lceil \frac{2}{3} (k + 1) \rceil$和$2k$之间。此外,我们还证明了圆弧和圆$k$ -可见图中$n$顶点上的最大边数对于$n > 4k+4$至多为$(k+1)(3n-k-2)$,对于$n \leq 4k+4$至多为${n \choose 2}$,而最大色数至多为$6k+6$ .在半弧$k$ -可见图的$n$顶点,我们证明了最大的边数是${n \choose 2}$的$n \leq 3k+3$和至多$(k+1)(2n-\frac{k+2}{2})$的$n > 3k+3$,而最大色数是至多$4k+4$。

英文摘要:

We examine several types of visibility graphs in which sightlines can pass through $k$ objects. For $k \geq 1$ we bound the maximum thickness of semi-bar $k$-visibility graphs between $\lceil \frac{2}{3} (k + 1) \rceil$ and $2k$. In addition we show that the maximum number of edges in arc and circle $k$-visibility graphs on $n$ vertices is at most $(k+1)(3n-k-2)$ for $n > 4k+4$ and ${n \choose 2}$ for $n \leq 4k+4$, while the maximum chromatic number is at most $6k+6$. In semi-arc $k$-visibility graphs on $n$ vertices, we show that the maximum number of edges is ${n \choose 2}$ for $n \leq 3k+3$ and at most $(k+1)(2n-\frac{k+2}{2})$ for $n > 3k+3$, while the maximum chromatic number is at most $4k+4$.

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