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On different “middle parts” of a tree. (English) Zbl 1393.05081
Summary: We determine the maximum distance between any two of the center, centroid, and subtree core among trees with a given order. Corresponding results are obtained for trees with given maximum degree and also for trees with given diameter. The problem of the maximum distance between the centroid and the subtree core among trees with given order and diameter becomes difficult. It can be solved in terms of the problem of minimizing the number of root-containing subtrees in a rooted tree of given order and height. While the latter problem remains unsolved, we provide a partial characterization of the extremal structure.

MSC:
05C05 Trees
05C12 Distance in graphs
05C35 Extremal problems in graph theory
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