proposition: Lemma subid_colP m n (I : 'cV[R]_m) (J : 'cV[R]_n) : reflect (forall i, (I i 0)%:M <= J)%IS (I <= J)%IS.
proof: Proof. by apply: (iffP forallP) => H i; rewrite (=^~memberE, memberE). 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