proposition: Lemma trmx_adj n (A : 'M[R]_n) : (\adj A)^T = \adj A^T.
proof: Proof. by apply/matrixP=> i j; rewrite !mxE cofactor_tr. 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)