proposition: Lemma genmx_bigcap P n (A_ : I -> 'M_n) : (<<\bigcap_(i | P i) A_ i>> = \bigcap_(i | P i) <<A_ i>>)%MS.
proof: Proof. exact: (big_morph _ (@genmx_cap n n n) (@genmx1 n)). Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg finalg zmodp matrix)