0.07/0.12 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.07/0.12 % 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 : n023.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 02:40:58 EDT 2022 0.12/0.33 % CPUTime : 0.12/0.37 % SZS status Unsatisfiable 0.12/0.37 0.12/0.37 % SZS output start Proof 0.12/0.37 Axiom 1 (w_definition): apply(apply(w, X), Y) = apply(apply(X, Y), Y). 0.12/0.37 Axiom 2 (b_definition): apply(apply(apply(b, X), Y), Z) = apply(X, apply(Y, Z)). 0.12/0.37 0.12/0.37 Goal 1 (prove_fixed_point): X = apply(combinator, X). 0.12/0.37 The goal is true when: 0.12/0.37 X = apply(apply(w, apply(b, combinator)), apply(w, apply(b, combinator))) 0.12/0.37 0.12/0.37 Proof: 0.12/0.37 apply(apply(w, apply(b, combinator)), apply(w, apply(b, combinator))) 0.12/0.37 = { by axiom 1 (w_definition) } 0.12/0.37 apply(apply(apply(b, combinator), apply(w, apply(b, combinator))), apply(w, apply(b, combinator))) 0.12/0.37 = { by axiom 2 (b_definition) } 0.12/0.37 apply(combinator, apply(apply(w, apply(b, combinator)), apply(w, apply(b, combinator)))) 0.12/0.37 % SZS output end Proof 0.12/0.37 0.12/0.37 RESULT: Unsatisfiable (the axioms are contradictory). 0.12/0.38 EOF