Graph minors. XXI. Graphs with unique linkages

Graph minors. XXI. Graphs with unique linkages
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图未成年人。

DOI:
10.1016/j.jctb.2008.08.003
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发表时间:
2009
期刊:
J. Comb. Theory B
影响因子:
--
通讯作者:
P. Seymour
P. Seymour
中科院分区:
--
文献类型:
--
作者:
N. Robertson;P. Seymour

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图G中的连杆L是一个子图,它的每个分量都是一条路径,如果V(L)=V(G),并且G中没有其他连接相同顶点对的连杆,这是至关重要的。我们证明,如果G与p个分量有一个重要的连杆,那么G的树宽度由p的一个函数所限。这是证明图小项XIII中未证明引理的主要步骤,并且它有许多其他的应用,包括缠结猜想的构造性证明。
A linkage L in a graph G is a subgraph each component of which is a path, and it is vital if V(L)=V(G) and there is no other linkage in G joining the same pairs of vertices. We show that, if G has a vital linkage with p components, then G has tree-width bounded above by a function of p. This is the major step in the proof of the unproved lemma from Graph Minors XIII, and it has a number of other applications, including a constructive proof of the intertwining conjecture.