A collection of sets related to the tutte polynomial of a matroid

A collection of sets related to the tutte polynomial of a matroid
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与拟阵的 tutte 多项式相关的集合的集合

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发表时间:
1984
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通讯作者:
J. Dawson
J. Dawson
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作者:
J. Dawson

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众所周知,如果我们对图的边,或者更一般地,拟阵的元素进行排序,那么每个生成森林或基,B都有一个子集ψ(B),其中有一个“内部被动”元素的子集,并且对于每个林,或独立集F,存在唯一的基B,使得ψ(B)⊆F⊆B。在拟阵的一般情况下,我们检查集合的集合的结构{ψ(B):B是基},特别是观察每个基数的这些集合的数字序列,我们猜想它是对数凹的。
It is known that if we order the edges of a graph, or more generally, elements of a matroid, then each spanning forest, or basis, B has a subset ψ(B) of "internally passive" elements, and for each forest, or independent set, F, there is a unique basis B such that ψ(B) ⊆ F ⊆ B. In the context of matroids generally, we examine the structure of the collection of sets {ψ(B) : B is a basis}, particularly looking at the sequence of numbers of these sets of each cardinality, which we conjecture is log-concave.