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arXiv 2010.01439cs.DMcs.CCcs.DSmath.CO
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燃烧几何图形

Burning Geometric Graphs

Arya Tanmay Gupta

摘要:

引入了一种称为\textit{graph burning}的程序,以便于对警报的传播、社会传染或图形和网络上的社会影响或情绪进行建模。图形燃烧在离散的时间步(或轮)上运行。在每个步骤$t$,首先(a)从“外部”燃烧未燃烧的顶点(作为\textit{fire source}),然后(b)火焰蔓延到与燃烧的顶点相邻的顶点,直到步骤$t-1$。此过程在$G$的所有顶点都已刻录后停止。目标是在最小的时间步长内燃烧给定图中的所有顶点。刻录图形所需的最少时间步数称为其\textit{burning number}。燃烧次数越少,图表燃烧的速度就越快。一般图的最优烧图是一个NP完全问题。已经证明了路径森林、蜘蛛图和最大度为3的树的最优燃烧是NP完全的。我们研究了\textit{geometric graphs}的几个子类上的\textit{graph burning problem}。我们证明了区间图(7.1节,定理7.1),置换图(7.2节,定理7.2)和圆盘图(7.3节,定理7.3)的最优燃烧是NP-完全的。此外,我们认为一般图的最佳燃烧(第9.2节,猜想9.1)不能近似优于3-近似因子。

英文摘要:

A procedure called \textit{graph burning} was introduced to facilitate the modelling of spread of an alarm, a social contagion, or a social influence or emotion on graphs and networks. Graph burning runs on discrete time-steps (or rounds). At each step $t$, first (a) an unburned vertex is burned (as a \textit{fire source}) from "outside", and then (b) the fire spreads to vertices adjacent to the vertices which are burned till step $t-1$. This process stops after all the vertices of $G$ have been burned. The aim is to burn all the vertices in a given graph in minimum time-steps. The least number of time-steps required to burn a graph is called its \textit{burning number}. The less the burning number is, the faster a graph can be burned. Burning a general graph optimally is an NP-Complete problem. It has been proved that optimal burning of path forests, spider graphs, and trees with maximum degree three is NP-Complete. We study the \textit{graph burning problem} on several sub-classes of \textit{geometric graphs}. We show that burning interval graphs (Section 7.1, Theorem 7.1), permutation graphs (Section 7.2, Theorem 7.2) and disk graphs (Section 7.3, Theorem 7.3) optimally is NP-Complete. In addition, we opine that optimal burning of general graphs (Section 9.2, Conjecture 9.1) cannot be approximated better than 3-approximation factor.

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