proposition: Lemma block_mx_const a : block_mx (const_mx a) (const_mx a) (const_mx a) (const_mx a) = const_mx a.
proof: Proof. by split_mxE. 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 countalg finalg zmodp)