proposition: Lemma opp_pi x : - \pi_{alg F} x = \pi_{alg F} (opp_algcreal x).
proof: Proof. by rewrite [- _]piE. 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)