proposition: Lemma etaC'_natural : naturality _ _ etaC'.
proof: Proof. by []. Qed.
imports: Reals mathcomp(all_ssreflect) mathcomp(boolp classical_sets) mathcomp(finmap) infotheo(Reals_ext classical_sets_ext ssrR ssr_ext) infotheo(fdist fsdist convex necset) monae_lib HB(structures) category