proposition: Lemma inv_pi x : (\pi_{alg F} x)^-1 = \pi_{alg F} (inv_algcreal x).
proof: Proof. by rewrite [_^-1]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)