proposition: Lemma pi_opp : {morph \pi_{alg F} : x / opp_algcreal x >-> opp_alg x}.
proof: Proof. by unlock opp_alg=> x; rewrite -equiv_alg /= !pi_algK. Qed.
imports: HB(structures) mathcomp.ssreflect.ssreflect mathcomp(ssrfun ssrbool eqtype ssrnat seq choice fintype) mathcomp(bigop order ssralg ssrnum ssrint rat poly polydiv polyorder) mathcomp(perm matrix mxpoly polyXY binomial generic_quotient) mathcomp(cauchyreals separable zmodp bigenough)