Abstract

If an undirected graph is the intersection graph of a set of intervals of the real line, it is called an interval graph and the set of intervals is called an interval representation of the graph. An interval graph typically has many representations that differ in the order of the endpoints of the intervals along the line. This paper gives three methods for describing these differences and shows how these methods can be used to determine whether a graph has a representation satisfying various restrictions on the relative positions of the intervals. It concludes with an application of these results to the subject of interval counts of interval graphs.

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