Finite Sholander Trees, Trees, and their Betweenness

Details Finite Sholander Trees, Trees, and their Betweenness Finite Sholander Trees, Trees, and their Betweenness

2011-01-15

arxiv.org/abs/1101.2957v1

Mathematics

Combinatorics

8 pages

Scientific paper

We provide a proof of Sholander's claim (Trees, lattices, order, and betweenness, Proc. Amer. Math. Soc. 3, 369-381 (1952)) concerning the representability of collections of so-called segments by trees, which yields a characterization of the interval function of a tree. Furthermore, we streamline Burigana's characterization (Tree representations of betweenness relations defined by intersection and inclusion, Mathematics and Social Sciences 185, 5-36 (2009)) of tree betweenness and provide a relatively short proof.

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