proposition: Lemma submxcol0 m i : submxcol (0 : 'M[V]_(sp, m)) i = 0.
proof: Proof. by apply/matrixP=> j j'; rewrite !mxE. Qed.
imports: HB(structures) mathcomp(ssreflect ssrbool ssrfun eqtype ssrnat seq choice) mathcomp(fintype finfun bigop finset fingroup perm order) mathcomp(div prime binomial ssralg countalg finalg zmodp)