fact: Definition t_0_W := (poly_arr (poly_arr (poly_var 0) (poly_var 0)) (poly_var 1)).
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