0.00/0.11 % Problem : theBenchmark.p : TPTP v0.0.0. Released v0.0.0. 0.11/0.11 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof 0.11/0.32 % Computer : n027.cluster.edu 0.11/0.32 % Model : x86_64 x86_64 0.11/0.32 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz 0.11/0.32 % Memory : 8042.1875MB 0.11/0.32 % OS : Linux 3.10.0-693.el7.x86_64 0.11/0.32 % CPULimit : 1200 0.11/0.32 % WCLimit : 120 0.11/0.32 % DateTime : Tue Jul 13 16:29:25 EDT 2021 0.11/0.32 % CPUTime : 0.16/0.56 % SZS status Theorem 0.16/0.56 0.16/0.56 % SZS output start Proof 0.16/0.56 Take the following subset of the input axioms: 0.16/0.56 fof('ass(cond(299, 0), 2)', axiom, ![Vd456, Vd457, Vd458]: (greater(Vd457, Vd458) => greater(vmul(Vd457, Vd456), vmul(Vd458, Vd456)))). 0.16/0.56 fof('holds(conjunct1(314), 510, 0)', axiom, greater(vd508, vd509)). 0.16/0.56 fof('holds(conjunct1(315), 514, 0)', conjecture, greater(vmul(vd508, vd511), vmul(vd509, vd511))). 0.16/0.56 0.16/0.56 Now clausify the problem and encode Horn clauses using encoding 3 of 0.16/0.56 http://www.cse.chalmers.se/~nicsma/papers/horn.pdf. 0.16/0.56 We repeatedly replace C & s=t => u=v by the two clauses: 0.16/0.56 fresh(y, y, x1...xn) = u 0.16/0.56 C => fresh(s, t, x1...xn) = v 0.16/0.56 where fresh is a fresh function symbol and x1..xn are the free 0.16/0.56 variables of u and v. 0.16/0.56 A predicate p(X) is encoded as p(X)=true (this is sound, because the 0.16/0.56 input problem has no model of domain size 1). 0.16/0.56 0.16/0.56 The encoding turns the above axioms into the following unit equations and goals: 0.16/0.56 0.16/0.56 Axiom 1 (holds(conjunct1(314), 510, 0)): greater(vd508, vd509) = true2. 0.16/0.56 Axiom 2 (ass(cond(299, 0), 2)): fresh26(X, X, Y, Z, W) = true2. 0.16/0.56 Axiom 3 (ass(cond(299, 0), 2)): fresh26(greater(X, Y), true2, Z, X, Y) = greater(vmul(X, Z), vmul(Y, Z)). 0.16/0.56 0.16/0.56 Goal 1 (holds(conjunct1(315), 514, 0)): greater(vmul(vd508, vd511), vmul(vd509, vd511)) = true2. 0.16/0.56 Proof: 0.16/0.56 greater(vmul(vd508, vd511), vmul(vd509, vd511)) 0.16/0.56 = { by axiom 3 (ass(cond(299, 0), 2)) R->L } 0.16/0.56 fresh26(greater(vd508, vd509), true2, vd511, vd508, vd509) 0.16/0.56 = { by axiom 1 (holds(conjunct1(314), 510, 0)) R->L } 0.16/0.56 fresh26(greater(vd508, vd509), greater(vd508, vd509), vd511, vd508, vd509) 0.16/0.56 = { by axiom 2 (ass(cond(299, 0), 2)) } 0.16/0.56 true2 0.16/0.56 % SZS output end Proof 0.16/0.56 0.16/0.56 RESULT: Theorem (the conjecture is true). 0.16/0.57 EOF