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Number of vertices of degree three in spanning 3-trees in square graphs

机译:在方形图中跨越三棵树三棵树的顶点数量

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摘要

In this paper, we show that the square graph of a tree T has a spanning tree of maximum degree at most three and with at most max {0, Sigma(x is an element of W >= 3) ((T)) (t(T) (x)-2)-2} vertices of degree three, where W->= 3 (T) = {x is an element of V (T) : there are at least three edge-disjoint paths of length at least two that start x} and t(T)(x) is the number of edge-disjoint paths with length at least two that start at a vertex x. (c) 2019 Elsevier Inc. All rights reserved.
机译:在本文中,我们表明树T的平方图具有最大程度的跨度树,最多三个,并且在最多最大{0,Σ(x是w> = 3的元素)((t))( t(t)(x)-2)-2}三度的顶点,其中w - > = 3(t)= {x是v(t)的元素:长度至少有三个边界不相交的路径 启动x}和t(t)(x)的至少两个是边缘不相交的路径的数量,其长度至少为顶点x。 (c)2019 Elsevier Inc.保留所有权利。

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