fact: Definition term_norm := (@subst_term_up_term_term_var, @subst_term_up_term_poly_type, @subst_term_up_poly_type_term_var, @subst_term_ren_term).
imports: List Lia Undecidability.SystemF.SysF Undecidability.SystemF.Autosubst.syntax Undecidability.SystemF.Autosubst.unscoped Undecidability.SystemF.Util(Facts poly_type_facts pure_term_facts) ssreflect ssrbool ssrfun