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arXiv 1807.09404math.CO
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图的节流半正定迫零传播时间

Throttling positive semidefinite zero forcing propagation time on graphs

Joshua Carlson, Leslie Hogben, Jürgen Kritschgau, Kate Lorenzen, Michael S. Ross, Seth Selken, Vicente Valle Martinez

摘要:

迫零是一个在图上将顶点着色为蓝色的过程,方法是从一些顶点开始并应用颜色更改规则。节流将最小化初始蓝色顶点集的大小和为图形着色所需的时间步长数之和。研究了半正定迫零的节流问题。我们建立了一个紧的下界上的半正定节流数的函数的阶,最大程度,和半正定迫零数的图,并确定了半正定节流数的路,圈,和满二叉树。我们刻画了具有极端半正定节流数的图。

英文摘要:

Zero forcing is a process on a graph that colors vertices blue by starting with some of the vertices blue and applying a color change rule. Throttling minimizes the sum of the size of the initial blue vertex set and the number of the time steps needed to color the graph. We study throttling for positive semidefinite zero forcing. We establish a tight lower bound on the positive semidefinite throttling number as a function of the order, maximum degree, and positive semidefinite zero forcing number of the graph, and determine the positive semidefinite throttling numbers of paths, cycles, and full binary trees. We characterize the graphs that have extreme positive semidefinite throttling numbers.

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