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In mathematics, the '''interval [[chromatic number]]''' ''X''<sub><</sub>(''H'') of an [[ordered graph]] ''H'' is the minimum number of intervals the (linearly ordered) vertex set of ''H'' can be [[partition of a set|partitioned]] into so that no two vertices belonging to the same interval are adjacent in ''H''.<ref>[[János Pach]], Gabor Tardos, "Forbidden Pattern and Unit Distances", page 1-9, 2005, ACM.</ref>
== Difference with chromatic number ==
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