fact: Definition fo_bisimilar X (M : fo_model Σ X) x y := forall φ, fol_syms φ ⊑ ls -> fol_rels φ ⊑ lr -> forall ρ, M,x·ρ ⊨ φ <-> M,y·ρ ⊨ φ.
imports: List Arith Nat Lia Relations Bool Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_nat finite) Undecidability.Shared.Libs.DLW.Vec(pos vec) Undecidability.FOL.TRAKHTENBROT(notations decidable gfp fol_ops fo_sig fo_terms fo_logic fo_definable fo_sat)