0.00/0.08 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.00/0.09 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.08/0.28 % Computer : n003.cluster.edu 0.08/0.28 % Model : x86_64 x86_64 0.08/0.28 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.08/0.28 % Memory : 8042.1875MB 0.08/0.28 % OS : Linux 3.10.0-693.el7.x86_64 0.08/0.28 % CPULimit : 1440 0.08/0.28 % WCLimit : 180 0.08/0.28 % DateTime : Mon Jul 3 04:13:45 EDT 2023 0.13/0.28 % CPUTime : 0.13/0.41 % SZS status Unsatisfiable 0.13/0.41 0.13/0.42 % SZS output start Proof 0.13/0.42 Axiom 1 (t_definition): apply(apply(t, X), Y) = apply(Y, X). 0.13/0.42 Axiom 2 (b_definition): apply(X, apply(Y, Z)) = apply(apply(apply(b, X), Y), Z). 0.13/0.42 0.13/0.42 Goal 1 (prove_q1_combinator): apply(apply(apply(X, f(X)), g(X)), h(X)) = apply(f(X), apply(h(X), g(X))). 0.13/0.42 The goal is true when: 0.13/0.42 X = apply(apply(b, apply(t, t)), apply(apply(b, b), b)) 0.13/0.42 0.13/0.42 Proof: 0.13/0.42 apply(apply(apply(apply(apply(b, apply(t, t)), apply(apply(b, b), b)), f(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), g(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))) 0.13/0.42 = { by axiom 2 (b_definition) R->L } 0.13/0.42 apply(apply(apply(apply(t, t), apply(apply(apply(b, b), b), f(apply(apply(b, apply(t, t)), apply(apply(b, b), b))))), g(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))) 0.13/0.42 = { by axiom 1 (t_definition) } 0.13/0.42 apply(apply(apply(apply(apply(apply(b, b), b), f(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), t), g(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))) 0.13/0.42 = { by axiom 2 (b_definition) R->L } 0.13/0.42 apply(apply(apply(apply(b, apply(b, f(apply(apply(b, apply(t, t)), apply(apply(b, b), b))))), t), g(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))) 0.13/0.42 = { by axiom 2 (b_definition) R->L } 0.13/0.42 apply(apply(apply(b, f(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), apply(t, g(apply(apply(b, apply(t, t)), apply(apply(b, b), b))))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))) 0.13/0.42 = { by axiom 2 (b_definition) R->L } 0.13/0.42 apply(f(apply(apply(b, apply(t, t)), apply(apply(b, b), b))), apply(apply(t, g(apply(apply(b, apply(t, t)), apply(apply(b, b), b)))), h(apply(apply(b, apply(t, t)), apply(apply(b, b), b))))) 0.13/0.42 = { by axiom 1 (t_definition) } 0.13/0.42 apply(f(apply(apply(b, apply(t, t)), apply(apply(b, b), b))), apply(h(apply(apply(b, apply(t, t)), apply(apply(b, b), b))), g(apply(apply(b, apply(t, t)), apply(apply(b, b), b))))) 0.13/0.42 % SZS output end Proof 0.13/0.42 0.13/0.42 RESULT: Unsatisfiable (the axioms are contradictory). 0.13/0.42 EOF