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[[File:Inversion qtl1.svg|thumb|Permutation with one of its inversions highlighted<br><br>It may be denoted by the pair of places (2, 4) or the pair of elements (5, 2).]]
In [[computer science]] and [[discrete mathematics]], a sequence has an '''inversion''' where two of its elements are out of their natural [[total order|order]].
== Definitions ==
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