Entanglements

Entanglements
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纠缠

DOI:
10.1016/j.jctb.2023.08.007
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发表时间:
2024
期刊:
Journal of Combinatorial Theory, Series B
影响因子:
--
通讯作者:
Carmesin J
Carmesin J
中科院分区:
--
文献类型:
--
作者:
Carmesin J

文献摘要

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Robertson和Seymour为每个图构造了Ga树分解,有效地区分了G中的所有缠结。虽然所有以前的建设,这些分解是迭代的性质或不规范,我们给出了一个明确的一步建设是canonical.The关键成分是axiomatisation的“本地属性”的缠结。局部有限图和拟阵的推广也进行了讨论。
Robertson and Seymour constructed for every graphGa tree-decomposition that efficiently distinguishes all the tangles inG. While all previous constructions of these decompositions are either iterative in nature or not canonical, we give an explicit one-step construction that is canonical.The key ingredient is an axiomatisation of ‘local properties’ of tangles. Generalisations to locally finite graphs and matroids are also discussed.