TSTP Solution File: GRP549-1 by Toma---0.4
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% File : Toma---0.4
% Problem : GRP549-1 : TPTP v8.1.2. Released v2.6.0.
% Transfm : none
% Format : tptp:raw
% Command : toma --casc %s
% Computer : n006.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 01:15:19 EDT 2023
% Result : Unsatisfiable 0.21s 0.43s
% Output : CNFRefutation 0.21s
% Verified :
% SZS Type : -
% Comments :
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%----WARNING: Could not form TPTP format derivation
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%----ORIGINAL SYSTEM OUTPUT
% 0.13/0.13 % Problem : GRP549-1 : TPTP v8.1.2. Released v2.6.0.
% 0.13/0.13 % Command : toma --casc %s
% 0.14/0.35 % Computer : n006.cluster.edu
% 0.14/0.35 % Model : x86_64 x86_64
% 0.14/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.14/0.35 % Memory : 8042.1875MB
% 0.14/0.35 % OS : Linux 3.10.0-693.el7.x86_64
% 0.14/0.35 % CPULimit : 300
% 0.14/0.35 % WCLimit : 300
% 0.14/0.35 % DateTime : Tue Aug 29 01:47:36 EDT 2023
% 0.14/0.35 % CPUTime :
% 0.21/0.43 % SZS status Unsatisfiable
% 0.21/0.43 % SZS output start Proof
% 0.21/0.43 original problem:
% 0.21/0.43 axioms:
% 0.21/0.43 divide(divide(identity(), A), divide(divide(divide(B, A), C), B)) = C
% 0.21/0.43 multiply(A, B) = divide(A, divide(identity(), B))
% 0.21/0.43 inverse(A) = divide(identity(), A)
% 0.21/0.43 identity() = divide(A, A)
% 0.21/0.43 goal:
% 0.21/0.43 multiply(inverse(a1()), a1()) != multiply(inverse(b1()), b1())
% 0.21/0.43 To show the unsatisfiability of the original goal,
% 0.21/0.43 it suffices to show that multiply(inverse(a1()), a1()) = multiply(inverse(b1()), b1()) (skolemized goal) is valid under the axioms.
% 0.21/0.43 Here is an equational proof:
% 0.21/0.43 1: multiply(X0, X1) = divide(X0, divide(identity(), X1)).
% 0.21/0.43 Proof: Axiom.
% 0.21/0.43
% 0.21/0.43 2: inverse(X0) = divide(identity(), X0).
% 0.21/0.43 Proof: Axiom.
% 0.21/0.43
% 0.21/0.43 3: identity() = divide(X0, X0).
% 0.21/0.43 Proof: Axiom.
% 0.21/0.43
% 0.21/0.43 5: multiply(X0, X1) = divide(X0, inverse(X1)).
% 0.21/0.43 Proof: Rewrite equation 1,
% 0.21/0.43 lhs with equations []
% 0.21/0.43 rhs with equations [2].
% 0.21/0.43
% 0.21/0.43 6: multiply(inverse(a1()), a1()) = multiply(inverse(b1()), b1()).
% 0.21/0.43 Proof: Rewrite lhs with equations [5,3]
% 0.21/0.43 rhs with equations [5,3].
% 0.21/0.43
% 0.21/0.43 % SZS output end Proof
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