Article ID Journal Published Year Pages File Type
4657107 Journal of Combinatorial Theory, Series B 2010 10 Pages PDF
Abstract

Let T be a tree all of whose internal vertices have degree at least three. In 1983 Jamison conjectured in JCT B that the average order of a subtree of T is at least half the order of T. In this paper a proof is provided. In addition, it is proved that the average order of a subtree of T is at most three quarters the order of T. Several open questions are stated.

Related Topics
Physical Sciences and Engineering Mathematics Discrete Mathematics and Combinatorics