proposition: Lemma geC0_conj x : 0 <= x -> x^* = x.
proof: Proof. by move=> /ger0_real/CrealP. Qed.
imports: HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq choice) mathcomp(ssrAC div fintype path bigop order finset fingroup) mathcomp(ssralg poly)