fact: Definition dvd_step (m n:nat) (d: R) (M: 'M[R]_(m,n)) : 'M[R]_(m,n) := map_mx (fun x => odflt 0 (x %/? d)) M.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path ssralg) mathcomp(fintype perm choice matrix bigop zmodp poly polydiv mxpoly) CoqEAL(ssrcomplements minor dvdring) polydvd