proposition: Lemma is_safe_environment_Gamma0 : Forall (is_safe_poly_type 0) Gamma0.
proof: Proof. do 3 (constructor; first by move=> /=; lia). constructor; [by apply: safe_poly_typeP | done]. Qed.
imports: PeanoNat List Lia Undecidability.SystemF.SysF Undecidability.SystemF.Autosubst.syntax Undecidability.SystemF.Util(Facts poly_type_facts term_facts typing_facts iipc2_facts sn_facts) Undecidability.DiophantineConstraints.H10C ssreflect ssrbool ssrfun