proposition: Lemma ler_to_alg : {mono to_alg : x y / x <= y}.
proof: Proof. apply: le_mono=> x y lt_xy; rewrite !piE -(rwP lt_algP). by apply/lt_creal_cst; rewrite lt_xy. 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)