fact: Variable (Y : Type) (Mn : fo_model Σn Y).
imports: List Arith Bool Lia Eqdep_dec Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_nat finite) Undecidability.Shared.Libs.DLW.Vec(pos vec) Undecidability.Shared.Libs.DLW.Wf(wf_finite) Undecidability.FOL.TRAKHTENBROT(notations decidable fol_ops fo_sig fo_terms fo_logic fo_sat membership hfs reln_hfs)