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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1990 Dec;87(23):9464–9466. doi: 10.1073/pnas.87.23.9464

The Steiner ratio conjecture of Gilbert and Pollak is true.

D Z Du 1, F K Hwang 1
PMCID: PMC55186  PMID: 11607122

Abstract

Let P be a set of n points on the euclidean plane. Let Ls(P) and Lm(P) denote the lengths of the Steiner minimum tree and the minimum spanning tree on P, respectively. In 1968, Gilbert and Pollak conjectured that for any P, Ls(P) >/= (radical3/2)Lm(P). We provide an abridged proof for their conjecture in this paper.

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