Mathematics – Number Theory
Scientific paper
2005-03-23
Mathematics
Number Theory
28 pages, 7 figures
Scientific paper
We use graphs to define sets of Salem and Pisot numbers, and prove that the union of these sets is closed, supporting a conjecture of Boyd that the set of all Salem and Pisot numbers is closed. We find all trees that define Salem numbers. We show that for all integers n the smallest known element of the n-th derived set of the set of Pisot numbers comes from a graph. We define the Mahler measure of a graph, and find all graphs of Mahler measure less than (1+sqrt5)/2. Finally, we list all small Salem numbers known to be definable using a graph.
McKee James
Smyth Chris
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