proposition: Lemma ntensmx2 : forall {m n} (A : 'M_(m,n)) , A ^t 2 = A *t A.
proof: Proof. by []. Qed.
imports: mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop ssralg matrix zmodp div)