proposition: Lemma sub_add0lid m n (I : 'cV[R]_n) : ((0 : 'cV[R]_m) +i I <= I)%IS.
proof: Proof. exact: (subid_trans (subid_addC 0 I) (sub_add0rid m I)). Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice fingroup) mathcomp(matrix bigop zmodp mxalgebra poly) ssrcomplements