Laminar matroids

Laminar matroids
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层状拟阵

DOI:
10.1016/j.ejc.2017.01.002
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发表时间:
2016
期刊:
Eur. J. Comb.
影响因子:
--
通讯作者:
J. Oxley
J. Oxley
中科院分区:
--
文献类型:
--
作者:
Tara Fife;J. Oxley

文献摘要

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层状族是集合E的子集的集合A,使得对于任何两个相交的集合,一个包含在另一个中。对于A上的容量函数c,设I为{I:|我是一个|A∈ A {A ∈ A}.则I是E上的(层状)拟阵的独立集的集合。我们提出了一种方法,压缩层介绍,其特征在于类的层拟阵由其排除的未成年人,提出了一种方法来构建所有层拟阵使用基本操作,并比较类的层拟阵的其他知名类的拟阵。
A laminar family is a collection A of subsets of a set E such that, for any two intersecting sets, one is contained in the other. For a capacity function c on A, let I be {I:| I∩ A|≤ c (A) for all A∈ A}. Then I is the collection of independent sets of a (laminar) matroid on E. We present a method of compacting laminar presentations, characterize the class of laminar matroids by their excluded minors, present a way to construct all laminar matroids using basic operations, and compare the class of laminar matroids to other well-known classes of matroids.