fact: Definition bareiss_char_poly n (M : mxR (1 + n) (1 + n)) := bareiss (char_poly_mx 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)