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Graceful Trees: Statistics and Algorithms

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Horton, M (2003) Graceful Trees: Statistics and Algorithms. Honours thesis, University of Tasmania. (Unpublished)

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Abstract

The Graceful Tree Conjecture is a problem in graph theory that dates back to 1967. It suggests that every tree on n nodes can be labelled with the integers [1..n] such that the edges, when labelled with the difference between their endpoint node labels, are uniquely labelled with the integers [1..n-1]. To date, no proof or disproof of the conjecture has been found, but all trees with up to 28 vertices have been shown to be graceful. The conjecture also leads to a problem in algorithm design for efficiently finding graceful labellings for trees. In this thesis, a new graceful labelling algorithm is described and used to show that all trees on 29 vertices are graceful. A study is also made of statistical trends in the proportion of tree labellings that are graceful. These trends offer strong additional evidence that every tree is graceful.

Item Type: Other
Keywords: Graceful Trees, Ringel, algorithm, graceful labelling, graceful tree conjecture
Publisher: Honours thesis, University of Tasmania
Date Deposited: 13 Jul 2004
Last Modified: 18 Nov 2014 03:10
URI: http://eprints.utas.edu.au/id/eprint/19
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