proposition: Lemma mx2_E01 a b c d : (mx2 a b c d) 0 1 = b.
proof: Proof. by do ?(rewrite mxE split1; case: unliftP=> //= * ); rewrite ord1 mxE mulr1n. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype matrix mxalgebra bigop zmodp perm choice) dvdring mxstructure minor stronglydiscrete coherent edr