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arXiv 1003.2028math.CO
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迫零参数与最小秩问题

Zero forcing parameters and minimum rank problems

Francesco Barioli, Wayne Barrett, Shaun M. Fallat, H. Tracy Hall, Leslie Hogben, Bryan Shader, P. van den Driessche, Hein van der Holst

摘要:

利用图G的迫零集的最小顶点数Z(G),研究了图G所描述的对称矩阵族的最大零度/最小秩.证明了对于阶至少为2的连通图,没有顶点在每个迫零集中。引入了半正定迫零数Z+(G),证明了Z+(G)等于|G| -OS(G),其中OS(G)是最近定义的序集数,是最小半正定秩的下界.利用半正定迫零数计算某些图的半正定最小秩。给出了实对称半正定最小秩大于复埃尔米特半正定最小秩的图的例子。

英文摘要:

The zero forcing number Z(G), which is the minimum number of vertices in a zero forcing set of a graph G, is used to study the maximum nullity / minimum rank of the family of symmetric matrices described by G. It is shown that for a connected graph of order at least two, no vertex is in every zero forcing set. The positive semidefinite zero forcing number Z_+(G) is introduced, and shown to be equal to |G|-OS(G), where OS(G) is the recently defined ordered set number that is a lower bound for minimum positive semidefinite rank. The positive semidefinite zero forcing number is applied to the computation of positive semidefinite minimum rank of certain graphs. An example of a graph for which the real positive symmetric semidefinite minimum rank is greater than the complex Hermitian positive semidefinite minimum rank is presented.

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