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 (Unpublished)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