Hypergraph characterization of split matroids
Hypergraph characterization of split matroids
复制标题
分裂拟阵的超图表征
DOI:
10.1016/j.jcta.2022.105697
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Yu Yokoi
中科院分区:
文献类型:
--
作者:
Kristof Berczi;Tamas Kiraly;Tamas Schwarcz;Yutaro Yamaguchi;Yu Yokoi
We provide a combinatorial study of split matroids, a class that was motivated by the study of matroid polytopes from a tropical geometry point of view. A nice feature of split matroids is that they generalize paving matroids, while being closed under duality and taking minors. Furthermore, these matroids proved to be useful in giving exact asymptotic bounds for the dimension of the Dressian, and also implied new results on the rays of the tropical Grassmannians.In the present paper, we introduce the notion of elementary split matroids, a subclass of split matroids that contains all connected split matroids. We give a hypergraph characterization of elementary split matroids in terms of independent sets, and show that the proposed class is closed not only under duality and taking minors but also truncation. We further show that, in contrast to split matroids, the proposed class can be characterized by a single forbidden minor. As an application, we provide a complete list of binary split matroids.
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DOI:
10.1016/j.jcta.2017.05.001
发表时间:
2017
期刊:
J. Comb. Theory, Ser. A
影响因子:
--
作者:
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通讯作者:
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影响因子:
0.8
作者:
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影响因子:
1.1
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通讯作者:
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影响因子:
--
作者:
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通讯作者:
S. Fujishige
影响因子:
0.3
作者:
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通讯作者:
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