fact: Variable (Σ : fo_signature) (e : rels Σ) (E : ar_rels Σ e = 2) (A : fol_form Σ).
imports: List Undecidability.Shared.Libs.DLW.Utils(finite) Undecidability.Shared.Libs.DLW.Vec(pos vec) Undecidability.FOL.TRAKHTENBROT(notations utils decidable fol_ops fo_sig fo_terms fo_logic)