0.02/0.12 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.02/0.12 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.11/0.33 % Computer : n027.cluster.edu 0.11/0.33 % Model : x86_64 x86_64 0.11/0.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.11/0.33 % Memory : 8042.1875MB 0.11/0.33 % OS : Linux 3.10.0-693.el7.x86_64 0.11/0.33 % CPULimit : 960 0.11/0.33 % WCLimit : 120 0.11/0.33 % DateTime : Tue Aug 9 03:52:06 EDT 2022 0.11/0.33 % CPUTime : 0.17/0.41 % SZS status Unsatisfiable 0.17/0.41 0.17/0.41 % SZS output start Proof 0.17/0.41 Axiom 1 (b_definition): apply(X, apply(Y, Z)) = apply(apply(apply(b, X), Y), Z). 0.17/0.41 Axiom 2 (n_definition): apply(apply(apply(n, X), Y), Z) = apply(apply(apply(X, Z), Y), Z). 0.17/0.41 0.17/0.41 Goal 1 (prove_fixed_point): apply(X, f(X)) = apply(f(X), apply(X, f(X))). 0.17/0.41 The goal is true when: 0.17/0.41 X = apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))) 0.17/0.41 0.17/0.41 Proof: 0.17/0.41 apply(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))) 0.17/0.41 = { by axiom 2 (n_definition) } 0.17/0.41 apply(apply(apply(apply(apply(b, apply(b, apply(n, b))), apply(n, apply(b, apply(b, apply(n, b))))), X), apply(n, apply(b, apply(b, apply(n, b))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))) 0.17/0.41 = { by axiom 1 (b_definition) R->L } 0.17/0.41 apply(apply(apply(apply(b, apply(n, b)), apply(apply(n, apply(b, apply(b, apply(n, b)))), X)), apply(n, apply(b, apply(b, apply(n, b))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))) 0.17/0.41 = { by axiom 1 (b_definition) R->L } 0.17/0.41 apply(apply(apply(n, b), apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b)))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))) 0.17/0.41 = { by axiom 2 (n_definition) } 0.17/0.41 apply(apply(apply(b, f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))), apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b)))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))))) 0.17/0.41 = { by axiom 1 (b_definition) R->L } 0.17/0.41 apply(f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b)))))), apply(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b))))), f(apply(apply(apply(n, apply(b, apply(b, apply(n, b)))), X), apply(n, apply(b, apply(b, apply(n, b)))))))) 0.17/0.41 % SZS output end Proof 0.17/0.41 0.17/0.41 RESULT: Unsatisfiable (the axioms are contradictory). 0.17/0.42 EOF