fact: Definition irreducibleb := ((1 < size p) && [forall q : {poly_((size p).-1) R}, (Pdiv.Ring.rdvdp q p)%R ==> (size q <= 1)])%N.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice fintype tuple) mathcomp(bigop binomial finset finfun ssralg countalg finalg poly polydiv) mathcomp(perm fingroup matrix mxalgebra mxpoly vector countalg)