fact: Definition bareiss n (M : mxpolyR (1 + n) (1 + n)) := bareiss_rec 1 M.
imports: mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq path ssralg) mathcomp(fintype perm choice matrix bigop zmodp poly polydiv mxpoly) CoqEAL(minor hrel param refinements seqmx)