proposition: Lemma ger0_real x : 0 <= x -> x \is real.
proof: Proof. by rewrite realE => ->. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)