0.08/0.13 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.08/0.13 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.13/0.34 % Computer : n006.cluster.edu 0.13/0.34 % Model : x86_64 x86_64 0.13/0.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.13/0.34 % Memory : 8042.1875MB 0.13/0.34 % OS : Linux 3.10.0-693.el7.x86_64 0.13/0.34 % CPULimit : 1200 0.13/0.34 % WCLimit : 120 0.13/0.34 % DateTime : Tue Jul 13 13:10:41 EDT 2021 0.13/0.35 % CPUTime : 0.19/0.50 % SZS status Unsatisfiable 0.19/0.50 0.19/0.51 % SZS output start Proof 0.19/0.51 Axiom 1 (t_definition): apply(apply(t, X), Y) = apply(Y, X). 0.19/0.51 Axiom 2 (b_definition): apply(apply(apply(b, X), Y), Z) = apply(X, apply(Y, Z)). 0.19/0.51 0.19/0.51 Goal 1 (prove_q_combinator): apply(apply(apply(X, f(X)), g(X)), h(X)) = apply(g(X), apply(f(X), h(X))). 0.19/0.51 The goal is true when: 0.19/0.51 X = apply(apply(b, apply(t, b)), apply(apply(b, b), t)) 0.19/0.51 0.19/0.51 Proof: 0.19/0.51 apply(apply(apply(apply(apply(b, apply(t, b)), apply(apply(b, b), t)), f(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), g(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 2 (b_definition) } 0.19/0.51 apply(apply(apply(apply(t, b), apply(apply(apply(b, b), t), f(apply(apply(b, apply(t, b)), apply(apply(b, b), t))))), g(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 1 (t_definition) } 0.19/0.51 apply(apply(apply(apply(apply(apply(b, b), t), f(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), b), g(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 2 (b_definition) } 0.19/0.51 apply(apply(apply(apply(b, apply(t, f(apply(apply(b, apply(t, b)), apply(apply(b, b), t))))), b), g(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 2 (b_definition) } 0.19/0.51 apply(apply(apply(t, f(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), apply(b, g(apply(apply(b, apply(t, b)), apply(apply(b, b), t))))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 1 (t_definition) } 0.19/0.51 apply(apply(apply(b, g(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), f(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t)))) 0.19/0.51 = { by axiom 2 (b_definition) } 0.19/0.51 apply(g(apply(apply(b, apply(t, b)), apply(apply(b, b), t))), apply(f(apply(apply(b, apply(t, b)), apply(apply(b, b), t))), h(apply(apply(b, apply(t, b)), apply(apply(b, b), t))))) 0.19/0.51 % SZS output end Proof 0.19/0.51 0.19/0.51 RESULT: Unsatisfiable (the axioms are contradictory). 0.19/0.51 EOF