0.04/0.13 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.04/0.13 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.13/0.35 % Computer : n003.cluster.edu 0.13/0.35 % Model : x86_64 x86_64 0.13/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.13/0.35 % Memory : 8042.1875MB 0.13/0.35 % OS : Linux 3.10.0-693.el7.x86_64 0.13/0.35 % CPULimit : 960 0.13/0.35 % WCLimit : 120 0.13/0.35 % DateTime : Tue Aug 9 03:17:21 EDT 2022 0.13/0.35 % CPUTime : 0.19/0.38 % SZS status Unsatisfiable 0.19/0.38 0.19/0.39 % SZS output start Proof 0.19/0.39 Axiom 1 (m_definition): apply(m, X) = apply(X, X). 0.19/0.39 Axiom 2 (q_definition): apply(apply(apply(q, X), Y), Z) = apply(Y, apply(X, Z)). 0.19/0.39 0.19/0.39 Goal 1 (prove_fixed_point): apply(f(X), apply(X, f(X))) = apply(X, f(X)). 0.19/0.39 The goal is true when: 0.19/0.39 X = apply(apply(q, apply(q, m)), m) 0.19/0.39 0.19/0.39 Proof: 0.19/0.39 apply(f(apply(apply(q, apply(q, m)), m)), apply(apply(apply(q, apply(q, m)), m), f(apply(apply(q, apply(q, m)), m)))) 0.19/0.39 = { by axiom 2 (q_definition) } 0.19/0.39 apply(f(apply(apply(q, apply(q, m)), m)), apply(m, apply(apply(q, m), f(apply(apply(q, apply(q, m)), m))))) 0.19/0.39 = { by axiom 2 (q_definition) R->L } 0.19/0.39 apply(apply(apply(q, m), f(apply(apply(q, apply(q, m)), m))), apply(apply(q, m), f(apply(apply(q, apply(q, m)), m)))) 0.19/0.39 = { by axiom 1 (m_definition) R->L } 0.19/0.39 apply(m, apply(apply(q, m), f(apply(apply(q, apply(q, m)), m)))) 0.19/0.39 = { by axiom 2 (q_definition) R->L } 0.19/0.39 apply(apply(apply(q, apply(q, m)), m), f(apply(apply(q, apply(q, m)), m))) 0.19/0.39 % SZS output end Proof 0.19/0.39 0.19/0.39 RESULT: Unsatisfiable (the axioms are contradictory). 0.19/0.39 EOF