0.06/0.12 % 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 0.13/0.33 % Computer : n028.cluster.edu 0.13/0.33 % Model : x86_64 x86_64 0.13/0.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.13/0.33 % Memory : 8042.1875MB 0.13/0.33 % OS : Linux 3.10.0-693.el7.x86_64 0.13/0.33 % CPULimit : 1440 0.13/0.33 % WCLimit : 180 0.13/0.33 % DateTime : Mon Jul 3 04:46:58 EDT 2023 0.13/0.33 % CPUTime : 5.09/1.01 % SZS status Unsatisfiable 5.09/1.01 5.09/1.02 % SZS output start Proof 5.09/1.02 Axiom 1 (t_definition): apply(apply(t, X), Y) = apply(Y, X). 5.09/1.02 Axiom 2 (b_definition): apply(apply(apply(b, X), Y), Z) = apply(X, apply(Y, Z)). 5.09/1.02 5.09/1.02 Goal 1 (prove_c_combinator): apply(apply(apply(X, f(X)), g(X)), h(X)) = apply(apply(f(X), h(X)), g(X)). 5.09/1.02 The goal is true when: 5.09/1.02 X = apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)) 5.09/1.02 5.09/1.02 Proof: 5.09/1.02 apply(apply(apply(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)), f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 2 (b_definition) } 5.09/1.02 apply(apply(apply(apply(t, apply(apply(b, b), t)), apply(apply(apply(b, b), t), f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))))), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 1 (t_definition) } 5.09/1.02 apply(apply(apply(apply(apply(apply(b, b), t), f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), apply(apply(b, b), t)), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 2 (b_definition) } 5.09/1.02 apply(apply(apply(apply(b, apply(t, f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))))), apply(apply(b, b), t)), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 2 (b_definition) } 5.09/1.02 apply(apply(apply(t, f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), apply(apply(apply(b, b), t), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 1 (t_definition) } 5.09/1.02 apply(apply(apply(apply(apply(b, b), t), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 2 (b_definition) } 5.09/1.02 apply(apply(apply(b, apply(t, g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))))), f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 = { by axiom 2 (b_definition) } 5.09/1.02 apply(apply(t, g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), apply(f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))))) 5.09/1.02 = { by axiom 1 (t_definition) } 5.09/1.02 apply(apply(f(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t))), h(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))), g(apply(apply(b, apply(t, apply(apply(b, b), t))), apply(apply(b, b), t)))) 5.09/1.02 % SZS output end Proof 5.09/1.02 5.09/1.02 RESULT: Unsatisfiable (the axioms are contradictory). 5.09/1.03 EOF