0.00/0.12 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.11/0.13 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.16/5.34 % Computer : n028.cluster.edu 0.16/5.34 % Model : x86_64 x86_64 0.16/5.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.16/5.34 % Memory : 8042.1875MB 0.16/5.34 % OS : Linux 3.10.0-693.el7.x86_64 0.16/5.34 % CPULimit : 960 0.16/5.34 % WCLimit : 120 0.16/5.34 % DateTime : Tue Aug 9 03:28:40 EDT 2022 0.16/5.34 % CPUTime : 0.19/5.41 % SZS status Unsatisfiable 0.19/5.41 0.19/5.42 % SZS output start Proof 0.19/5.42 Axiom 1 (w1_definition): apply(apply(X, Y), Y) = apply(apply(w1, Y), X). 0.19/5.42 Axiom 2 (b_definition): apply(apply(apply(b, X), Y), Z) = apply(X, apply(Y, Z)). 0.19/5.42 0.19/5.42 Goal 1 (prove_fixed_point): X = apply(combinator, X). 0.19/5.42 The goal is true when: 0.19/5.42 X = apply(apply(w1, apply(apply(b, apply(b, combinator)), w1)), apply(apply(b, apply(b, combinator)), w1)) 0.19/5.42 0.19/5.42 Proof: 0.19/5.42 apply(apply(w1, apply(apply(b, apply(b, combinator)), w1)), apply(apply(b, apply(b, combinator)), w1)) 0.19/5.42 = { by axiom 1 (w1_definition) R->L } 0.19/5.42 apply(apply(apply(apply(b, apply(b, combinator)), w1), apply(apply(b, apply(b, combinator)), w1)), apply(apply(b, apply(b, combinator)), w1)) 0.19/5.42 = { by axiom 2 (b_definition) } 0.19/5.42 apply(apply(apply(b, combinator), apply(w1, apply(apply(b, apply(b, combinator)), w1))), apply(apply(b, apply(b, combinator)), w1)) 0.19/5.42 = { by axiom 2 (b_definition) } 0.19/5.42 apply(combinator, apply(apply(w1, apply(apply(b, apply(b, combinator)), w1)), apply(apply(b, apply(b, combinator)), w1))) 0.19/5.42 % SZS output end Proof 0.19/5.42 0.19/5.42 RESULT: Unsatisfiable (the axioms are contradictory). 0.19/5.42 EOF