proposition: Lemma dvd_ker_mod_1 m0 m1 m2 (M : 'M[R]_(m0,m2)) (N : 'M[R]_(m1,m2)) : (M.-ker N %| 1%:M) = (M %| N).
proof: Proof. by rewrite dvd_ker mul1mx. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path) mathcomp(ssralg fintype perm choice matrix bigop zmodp mxalgebra poly) ssrcomplements dvdring stronglydiscrete