TSTP Solution File: GRP091-1 by Twee---2.4.2
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%------------------------------------------------------------------------------
% File : Twee---2.4.2
% Problem : GRP091-1 : TPTP v8.1.2. Bugfixed v2.7.0.
% Transfm : none
% Format : tptp:raw
% Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% Computer : n031.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8042.1875MB
% OS : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Thu Aug 31 01:16:56 EDT 2023
% Result : Unsatisfiable 0.09s 0.41s
% Output : Proof 0.16s
% Verified :
% SZS Type : -
% Comments :
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%----WARNING: Could not form TPTP format derivation
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%----ORIGINAL SYSTEM OUTPUT
% 0.02/0.15 % Problem : GRP091-1 : TPTP v8.1.2. Bugfixed v2.7.0.
% 0.02/0.16 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.09/0.35 % Computer : n031.cluster.edu
% 0.09/0.35 % Model : x86_64 x86_64
% 0.09/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.09/0.35 % Memory : 8042.1875MB
% 0.09/0.35 % OS : Linux 3.10.0-693.el7.x86_64
% 0.09/0.36 % CPULimit : 300
% 0.09/0.36 % WCLimit : 300
% 0.09/0.36 % DateTime : Tue Aug 29 00:14:10 EDT 2023
% 0.09/0.36 % CPUTime :
% 0.09/0.41 Command-line arguments: --no-flatten-goal
% 0.09/0.41
% 0.09/0.41 % SZS status Unsatisfiable
% 0.09/0.41
% 0.16/0.42 % SZS output start Proof
% 0.16/0.42 Take the following subset of the input axioms:
% 0.16/0.42 fof(identity, axiom, ![X]: identity=divide(X, X)).
% 0.16/0.42 fof(inverse, axiom, ![Z, X2]: inverse(X2)=divide(divide(Z, Z), X2)).
% 0.16/0.42 fof(multiply, axiom, ![Y, X2, Z2]: multiply(X2, Y)=divide(X2, divide(divide(Z2, Z2), Y))).
% 0.16/0.42 fof(prove_these_axioms, negated_conjecture, multiply(inverse(a1), a1)!=multiply(inverse(b1), b1) | (multiply(multiply(inverse(b2), b2), a2)!=a2 | (multiply(multiply(a3, b3), c3)!=multiply(a3, multiply(b3, c3)) | multiply(a4, b4)!=multiply(b4, a4)))).
% 0.16/0.42 fof(single_axiom, axiom, ![X2, Y2, Z2]: divide(divide(X2, divide(divide(X2, Y2), Z2)), Y2)=Z2).
% 0.16/0.42
% 0.16/0.42 Now clausify the problem and encode Horn clauses using encoding 3 of
% 0.16/0.42 http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 0.16/0.42 We repeatedly replace C & s=t => u=v by the two clauses:
% 0.16/0.42 fresh(y, y, x1...xn) = u
% 0.16/0.42 C => fresh(s, t, x1...xn) = v
% 0.16/0.42 where fresh is a fresh function symbol and x1..xn are the free
% 0.16/0.42 variables of u and v.
% 0.16/0.42 A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 0.16/0.42 input problem has no model of domain size 1).
% 0.16/0.42
% 0.16/0.42 The encoding turns the above axioms into the following unit equations and goals:
% 0.16/0.42
% 0.16/0.42 Axiom 1 (identity): identity = divide(X, X).
% 0.16/0.42 Axiom 2 (inverse): inverse(X) = divide(divide(Y, Y), X).
% 0.16/0.42 Axiom 3 (multiply): multiply(X, Y) = divide(X, divide(divide(Z, Z), Y)).
% 0.16/0.42 Axiom 4 (single_axiom): divide(divide(X, divide(divide(X, Y), Z)), Y) = Z.
% 0.16/0.42
% 0.16/0.42 Lemma 5: divide(identity, X) = inverse(X).
% 0.16/0.42 Proof:
% 0.16/0.42 divide(identity, X)
% 0.16/0.42 = { by axiom 1 (identity) }
% 0.16/0.42 divide(divide(Y, Y), X)
% 0.16/0.42 = { by axiom 2 (inverse) R->L }
% 0.16/0.42 inverse(X)
% 0.16/0.42
% 0.16/0.42 Lemma 6: divide(X, inverse(Y)) = multiply(X, Y).
% 0.16/0.42 Proof:
% 0.16/0.42 divide(X, inverse(Y))
% 0.16/0.42 = { by lemma 5 R->L }
% 0.16/0.42 divide(X, divide(identity, Y))
% 0.16/0.42 = { by axiom 1 (identity) }
% 0.16/0.42 divide(X, divide(divide(Z, Z), Y))
% 0.16/0.42 = { by axiom 3 (multiply) R->L }
% 0.16/0.42 multiply(X, Y)
% 0.16/0.42
% 0.16/0.42 Lemma 7: multiply(inverse(X), X) = identity.
% 0.16/0.42 Proof:
% 0.16/0.42 multiply(inverse(X), X)
% 0.16/0.42 = { by lemma 6 R->L }
% 0.16/0.42 divide(inverse(X), inverse(X))
% 0.16/0.42 = { by axiom 1 (identity) R->L }
% 0.16/0.42 identity
% 0.16/0.42
% 0.16/0.42 Lemma 8: divide(multiply(X, Y), X) = Y.
% 0.16/0.42 Proof:
% 0.16/0.42 divide(multiply(X, Y), X)
% 0.16/0.42 = { by lemma 6 R->L }
% 0.16/0.42 divide(divide(X, inverse(Y)), X)
% 0.16/0.42 = { by lemma 5 R->L }
% 0.16/0.42 divide(divide(X, divide(identity, Y)), X)
% 0.16/0.42 = { by axiom 1 (identity) }
% 0.16/0.42 divide(divide(X, divide(divide(X, X), Y)), X)
% 0.16/0.42 = { by axiom 4 (single_axiom) }
% 0.16/0.42 Y
% 0.16/0.42
% 0.16/0.42 Lemma 9: inverse(inverse(X)) = X.
% 0.16/0.42 Proof:
% 0.16/0.42 inverse(inverse(X))
% 0.16/0.42 = { by lemma 5 R->L }
% 0.16/0.42 divide(identity, inverse(X))
% 0.16/0.42 = { by lemma 7 R->L }
% 0.16/0.42 divide(multiply(inverse(X), X), inverse(X))
% 0.16/0.42 = { by lemma 8 }
% 0.16/0.42 X
% 0.16/0.42
% 0.16/0.42 Lemma 10: multiply(identity, X) = inverse(inverse(X)).
% 0.16/0.43 Proof:
% 0.16/0.43 multiply(identity, X)
% 0.16/0.43 = { by lemma 6 R->L }
% 0.16/0.43 divide(identity, inverse(X))
% 0.16/0.43 = { by lemma 5 }
% 0.16/0.43 inverse(inverse(X))
% 0.16/0.43
% 0.16/0.43 Lemma 11: divide(X, divide(X, Y)) = Y.
% 0.16/0.43 Proof:
% 0.16/0.43 divide(X, divide(X, Y))
% 0.16/0.43 = { by axiom 4 (single_axiom) R->L }
% 0.16/0.43 divide(X, divide(divide(X, divide(divide(X, Y), divide(X, Y))), Y))
% 0.16/0.43 = { by axiom 1 (identity) R->L }
% 0.16/0.43 divide(X, divide(divide(X, identity), Y))
% 0.16/0.43 = { by lemma 8 R->L }
% 0.16/0.43 divide(multiply(identity, divide(X, divide(divide(X, identity), Y))), identity)
% 0.16/0.43 = { by lemma 10 }
% 0.16/0.43 divide(inverse(inverse(divide(X, divide(divide(X, identity), Y)))), identity)
% 0.16/0.43 = { by lemma 9 }
% 0.16/0.43 divide(divide(X, divide(divide(X, identity), Y)), identity)
% 0.16/0.43 = { by axiom 4 (single_axiom) }
% 0.16/0.43 Y
% 0.16/0.43
% 0.16/0.43 Lemma 12: multiply(Y, X) = multiply(X, Y).
% 0.16/0.43 Proof:
% 0.16/0.43 multiply(Y, X)
% 0.16/0.43 = { by lemma 9 R->L }
% 0.16/0.43 multiply(inverse(inverse(Y)), X)
% 0.16/0.43 = { by lemma 11 R->L }
% 0.16/0.43 divide(multiply(multiply(inverse(inverse(Y)), X), inverse(Y)), divide(multiply(multiply(inverse(inverse(Y)), X), inverse(Y)), multiply(inverse(inverse(Y)), X)))
% 0.16/0.43 = { by lemma 8 }
% 0.16/0.43 divide(multiply(multiply(inverse(inverse(Y)), X), inverse(Y)), inverse(Y))
% 0.16/0.43 = { by lemma 6 R->L }
% 0.16/0.43 divide(divide(multiply(inverse(inverse(Y)), X), inverse(inverse(Y))), inverse(Y))
% 0.16/0.43 = { by lemma 8 }
% 0.16/0.43 divide(X, inverse(Y))
% 0.16/0.43 = { by lemma 6 }
% 0.16/0.43 multiply(X, Y)
% 0.16/0.43
% 0.16/0.43 Lemma 13: divide(X, multiply(X, Y)) = inverse(Y).
% 0.16/0.43 Proof:
% 0.16/0.43 divide(X, multiply(X, Y))
% 0.16/0.43 = { by lemma 6 R->L }
% 0.16/0.43 divide(X, divide(X, inverse(Y)))
% 0.16/0.43 = { by lemma 11 }
% 0.16/0.43 inverse(Y)
% 0.16/0.43
% 0.16/0.43 Lemma 14: divide(divide(X, Y), X) = inverse(Y).
% 0.16/0.43 Proof:
% 0.16/0.43 divide(divide(X, Y), X)
% 0.16/0.43 = { by lemma 9 R->L }
% 0.16/0.43 divide(divide(X, inverse(inverse(Y))), X)
% 0.16/0.43 = { by lemma 6 }
% 0.16/0.43 divide(multiply(X, inverse(Y)), X)
% 0.16/0.43 = { by lemma 8 }
% 0.16/0.43 inverse(Y)
% 0.16/0.43
% 0.16/0.43 Lemma 15: multiply(X, divide(Y, Z)) = divide(multiply(X, Y), Z).
% 0.16/0.43 Proof:
% 0.16/0.43 multiply(X, divide(Y, Z))
% 0.16/0.43 = { by lemma 12 }
% 0.16/0.43 multiply(divide(Y, Z), X)
% 0.16/0.43 = { by axiom 4 (single_axiom) R->L }
% 0.16/0.43 divide(divide(Y, divide(divide(Y, Z), multiply(divide(Y, Z), X))), Z)
% 0.16/0.43 = { by lemma 13 }
% 0.16/0.43 divide(divide(Y, inverse(X)), Z)
% 0.16/0.43 = { by lemma 6 }
% 0.16/0.43 divide(multiply(Y, X), Z)
% 0.16/0.43 = { by lemma 12 R->L }
% 0.16/0.43 divide(multiply(X, Y), Z)
% 0.16/0.43
% 0.16/0.43 Goal 1 (prove_these_axioms): tuple(multiply(multiply(inverse(b2), b2), a2), multiply(multiply(a3, b3), c3), multiply(inverse(a1), a1), multiply(a4, b4)) = tuple(a2, multiply(a3, multiply(b3, c3)), multiply(inverse(b1), b1), multiply(b4, a4)).
% 0.16/0.43 Proof:
% 0.16/0.43 tuple(multiply(multiply(inverse(b2), b2), a2), multiply(multiply(a3, b3), c3), multiply(inverse(a1), a1), multiply(a4, b4))
% 0.16/0.43 = { by lemma 7 }
% 0.16/0.43 tuple(multiply(identity, a2), multiply(multiply(a3, b3), c3), multiply(inverse(a1), a1), multiply(a4, b4))
% 0.16/0.43 = { by lemma 7 }
% 0.16/0.43 tuple(multiply(identity, a2), multiply(multiply(a3, b3), c3), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 10 }
% 0.16/0.43 tuple(inverse(inverse(a2)), multiply(multiply(a3, b3), c3), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 9 }
% 0.16/0.43 tuple(a2, multiply(multiply(a3, b3), c3), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 R->L }
% 0.16/0.43 tuple(a2, multiply(c3, multiply(a3, b3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 }
% 0.16/0.43 tuple(a2, multiply(c3, multiply(b3, a3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 6 R->L }
% 0.16/0.43 tuple(a2, divide(c3, inverse(multiply(b3, a3))), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 }
% 0.16/0.43 tuple(a2, divide(c3, inverse(multiply(a3, b3))), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 14 R->L }
% 0.16/0.43 tuple(a2, divide(c3, divide(divide(a3, multiply(a3, b3)), a3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 13 }
% 0.16/0.43 tuple(a2, divide(c3, divide(inverse(b3), a3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 11 R->L }
% 0.16/0.43 tuple(a2, divide(c3, divide(divide(a3, divide(a3, inverse(b3))), a3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 14 }
% 0.16/0.43 tuple(a2, divide(c3, inverse(divide(a3, inverse(b3)))), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 6 }
% 0.16/0.43 tuple(a2, multiply(c3, divide(a3, inverse(b3))), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 15 }
% 0.16/0.43 tuple(a2, divide(multiply(c3, a3), inverse(b3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 R->L }
% 0.16/0.43 tuple(a2, divide(multiply(a3, c3), inverse(b3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 15 R->L }
% 0.16/0.43 tuple(a2, multiply(a3, divide(c3, inverse(b3))), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 6 }
% 0.16/0.43 tuple(a2, multiply(a3, multiply(c3, b3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 R->L }
% 0.16/0.43 tuple(a2, multiply(a3, multiply(b3, c3)), identity, multiply(a4, b4))
% 0.16/0.43 = { by lemma 12 }
% 0.16/0.43 tuple(a2, multiply(a3, multiply(b3, c3)), identity, multiply(b4, a4))
% 0.16/0.43 = { by lemma 7 R->L }
% 0.16/0.43 tuple(a2, multiply(a3, multiply(b3, c3)), multiply(inverse(b1), b1), multiply(b4, a4))
% 0.16/0.43 % SZS output end Proof
% 0.16/0.43
% 0.16/0.43 RESULT: Unsatisfiable (the axioms are contradictory).
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