proposition: Lemma opp_block_mx m1 m2 n1 n2 (Aul : 'M_(m1, n1)) Aur Adl (Adr : 'M_(m2, n2)) : - block_mx Aul Aur Adl Adr = block_mx (- Aul) (- Aur) (- Adl) (- Adr).
proof: Proof. by rewrite opp_col_mx !opp_row_mx. 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)