0.00/0.07 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.00/0.07 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.07/0.26 % Computer : n019.cluster.edu 0.07/0.26 % Model : x86_64 x86_64 0.07/0.26 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.07/0.26 % Memory : 8042.1875MB 0.07/0.26 % OS : Linux 3.10.0-693.el7.x86_64 0.07/0.26 % CPULimit : 960 0.07/0.26 % WCLimit : 120 0.07/0.26 % DateTime : Tue Aug 9 03:55:05 EDT 2022 0.07/0.26 % CPUTime : 0.10/0.35 % SZS status Unsatisfiable 0.10/0.35 0.10/0.35 % SZS output start Proof 0.10/0.35 Axiom 1 (t_definition): apply(X, Y) = apply(apply(t, Y), X). 0.10/0.35 Axiom 2 (b_definition): apply(X, apply(Y, Z)) = apply(apply(apply(b, X), Y), Z). 0.10/0.35 0.10/0.35 Goal 1 (prove_q1_combinator): apply(apply(apply(X, f(X)), g(X)), h(X)) = apply(f(X), apply(h(X), g(X))). 0.10/0.35 The goal is true when: 0.10/0.35 X = apply(apply(b, apply(t, t)), apply(apply(b, b), b)) 0.10/0.35 0.10/0.35 Proof: 0.10/0.35 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)))) 0.10/0.35 = { by axiom 2 (b_definition) R->L } 0.10/0.35 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)))) 0.10/0.35 = { by axiom 1 (t_definition) R->L } 0.10/0.35 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)))) 0.10/0.35 = { by axiom 2 (b_definition) R->L } 0.10/0.35 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)))) 0.10/0.35 = { by axiom 2 (b_definition) R->L } 0.10/0.35 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)))) 0.10/0.35 = { by axiom 2 (b_definition) R->L } 0.10/0.35 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))))) 0.10/0.35 = { by axiom 1 (t_definition) R->L } 0.10/0.35 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))))) 0.10/0.35 % SZS output end Proof 0.10/0.35 0.10/0.35 RESULT: Unsatisfiable (the axioms are contradictory). 0.10/0.36 EOF