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arXiv 1802.09334math.CO
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关于递增树的质心

On the centroid of increasing trees

Kevin Durant, Stephan Wagner

AI总结:

本文推广随机递归树中质心节点的已知结果至更广泛的非常简单的递增树类,推导了最接近根的质心节点的深度、标签及子树大小的分布极限和矩。

摘要:

树中的质心节点是指到所有其他节点的距离之和达到最小值的节点,或者等价地,具有其任何分支包含的节点数不超过其他节点总数一半的性质的节点。我们将关于随机递归树中质心节点行为的若干已知结果(归功于Moon)推广到非常简单的递增树类别,该类别还包括平面有向递增树和$d$元递增树家族。特别地,我们推导了最接近根的质心节点的深度和标签,以及以该节点为根的子树大小的分布极限和矩。

英文摘要:

A centroid node in a tree is a node for which the sum of the distances to all other nodes attains its minimum, or equivalently a node with the property that none of its branches contains more than half of the other nodes. We generalise some known results regarding the behaviour of centroid nodes in random recursive trees (due to Moon) to the class of very simple increasing trees, which also includes the families of plane-oriented and $d$-ary increasing trees. In particular, we derive limits of distributions and moments for the depth and label of the centroid node nearest to the root, as well as for the size of the subtree rooted at this node.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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