proposition: Lemma stablemxN : stablemx V (- f) = stablemx V f.
proof: Proof. by rewrite mulmxN eqmx_opp. 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)