proposition: Lemma mx2_E00 a b c d : (mx2 a b c d) 0 0 = a.
proof: Proof. by do ?(rewrite mxE split1; case: unliftP=> //=); rewrite 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