fact: Fixpoint gcdp_rec (n : nat) (p q : {poly R}) := let r := rmodp p q in if r == 0 then q else if n is n'.+1 then gcdp_rec n' q (pp r) else pp r.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat div seq) mathcomp(path choice fintype tuple finset ssralg) mathcomp(matrix poly) mathcomp(bigop polydiv) CoqEAL(stronglydiscrete dvdring)