proposition: Lemma pure_typable_K'I {Gamma M N}: pure_typable Gamma M -> pure_typable Gamma N -> pure_typable Gamma (K' M N).
proof: Proof. move=> [tM] ? ?. exists tM. by apply: pure_typing_K'I. Qed.
imports: List Lia Relation_Definitions Relation_Operators Operators_Properties Undecidability.SystemF.SysF Undecidability.SystemF.Autosubst.syntax Undecidability.SystemF.Autosubst.unscoped Undecidability.SystemF.Util(Facts poly_type_facts pure_term_facts term_facts typing_facts iipc2_facts pure_typing_facts) ssreflect ssrbool ssrfun