fact: Definition determinant n (A : 'M_n) : R := \sum_(s : 'S_n) (-1) ^+ s * \prod_i A i (s i).
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)