0.06/0.11 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.06/0.12 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.12/0.33 % Computer : n006.cluster.edu 0.12/0.33 % Model : x86_64 x86_64 0.12/0.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.12/0.33 % Memory : 8042.1875MB 0.12/0.33 % OS : Linux 3.10.0-693.el7.x86_64 0.12/0.33 % CPULimit : 960 0.12/0.33 % WCLimit : 120 0.12/0.33 % DateTime : Tue Aug 9 02:25:29 EDT 2022 0.12/0.33 % CPUTime : 0.12/0.38 % SZS status Unsatisfiable 0.12/0.38 0.12/0.38 % SZS output start Proof 0.12/0.38 Axiom 1 (m_definition): apply(m, X) = apply(X, X). 0.12/0.38 Axiom 2 (l_definition): apply(apply(l, X), Y) = apply(X, apply(Y, Y)). 0.12/0.38 Axiom 3 (b_definition): apply(X, apply(Y, Z)) = apply(apply(apply(b, X), Y), Z). 0.12/0.38 0.12/0.38 Goal 1 (prove_fixed_point): apply(f(X), apply(X, f(X))) = apply(X, f(X)). 0.12/0.38 The goal is true when: 0.12/0.38 X = apply(apply(b, m), l) 0.12/0.38 0.12/0.38 Proof: 0.12/0.38 apply(f(apply(apply(b, m), l)), apply(apply(apply(b, m), l), f(apply(apply(b, m), l)))) 0.12/0.38 = { by axiom 3 (b_definition) R->L } 0.12/0.38 apply(f(apply(apply(b, m), l)), apply(m, apply(l, f(apply(apply(b, m), l))))) 0.12/0.38 = { by axiom 1 (m_definition) } 0.12/0.38 apply(f(apply(apply(b, m), l)), apply(apply(l, f(apply(apply(b, m), l))), apply(l, f(apply(apply(b, m), l))))) 0.12/0.38 = { by axiom 2 (l_definition) R->L } 0.12/0.38 apply(apply(l, f(apply(apply(b, m), l))), apply(l, f(apply(apply(b, m), l)))) 0.12/0.38 = { by axiom 1 (m_definition) R->L } 0.12/0.38 apply(m, apply(l, f(apply(apply(b, m), l)))) 0.12/0.38 = { by axiom 3 (b_definition) } 0.12/0.38 apply(apply(apply(b, m), l), f(apply(apply(b, m), l))) 0.12/0.38 % SZS output end Proof 0.12/0.38 0.12/0.38 RESULT: Unsatisfiable (the axioms are contradictory). 0.12/0.38 EOF