fact: Definition Gamma_W : list poly_type := [poly_abs (poly_abs t_0_W); many_poly_abs n_W t_1_W].
imports: List Lia Undecidability.SystemF.SysF Undecidability.SystemF.Autosubst.syntax Undecidability.SystemF.Util(Facts poly_type_facts pure_term_facts term_facts typing_facts pure_typing_facts pure_typable_prenex) ssreflect ssrbool ssrfun