fact: Hypothesis ker_colP : forall m (M : 'cV_m) (X : 'rV_m), reflect (exists Y , X = Y *m ker_col M) (X *m M == 0).
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