View source for Talk:Derangement

==Nomenclature==
I believe that "inversion" in the context of permutations is far more commonly used to denote a pair $i<j$ such that $\pi(i) > \pi(j)$ – and indeed that is how is is used in the article on [[determinant]]s – and that the subject of this article is more commonly described as a "derangement".  [[User:Richard Pinch|Richard Pinch]] ([[User talk:Richard Pinch|talk]]) 21:34, 30 November 2016 (CET)