%------------------------------------------------------------------------------
% File     : Twee---2.4.2
% Problem  : GRP549-1 : TPTP v8.1.2. Released v2.6.0.
% 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 : n023.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 01:18:52 EDT 2023

% Result   : Unsatisfiable 0.20s 0.37s
% Output   : Proof 0.20s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.03/0.12  % Problem  : GRP549-1 : TPTP v8.1.2. Released v2.6.0.
% 0.03/0.13  % Command  : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.13/0.34  % Computer : n023.cluster.edu
% 0.13/0.34  % Model    : x86_64 x86_64
% 0.13/0.34  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.13/0.34  % Memory   : 8042.1875MB
% 0.13/0.34  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.13/0.34  % CPULimit : 300
% 0.13/0.34  % WCLimit  : 300
% 0.13/0.34  % DateTime : Tue Aug 29 02:10:25 EDT 2023
% 0.13/0.34  % CPUTime  : 
% 0.20/0.37  Command-line arguments: --no-flatten-goal
% 0.20/0.37  
% 0.20/0.37  % SZS status Unsatisfiable
% 0.20/0.37  
% 0.20/0.37  % SZS output start Proof
% 0.20/0.37  Axiom 1 (identity): identity = divide(X, X).
% 0.20/0.37  Axiom 2 (inverse): inverse(X) = divide(identity, X).
% 0.20/0.38  Axiom 3 (multiply): multiply(X, Y) = divide(X, divide(identity, Y)).
% 0.20/0.38  
% 0.20/0.38  Lemma 4: multiply(inverse(X), X) = identity.
% 0.20/0.38  Proof:
% 0.20/0.38    multiply(inverse(X), X)
% 0.20/0.38  = { by axiom 3 (multiply) }
% 0.20/0.38    divide(inverse(X), divide(identity, X))
% 0.20/0.38  = { by axiom 2 (inverse) R->L }
% 0.20/0.38    divide(inverse(X), inverse(X))
% 0.20/0.38  = { by axiom 1 (identity) R->L }
% 0.20/0.38    identity
% 0.20/0.38  
% 0.20/0.38  Goal 1 (prove_these_axioms_1): multiply(inverse(a1), a1) = multiply(inverse(b1), b1).
% 0.20/0.38  Proof:
% 0.20/0.38    multiply(inverse(a1), a1)
% 0.20/0.38  = { by lemma 4 }
% 0.20/0.38    identity
% 0.20/0.38  = { by lemma 4 R->L }
% 0.20/0.38    multiply(inverse(b1), b1)
% 0.20/0.38  % SZS output end Proof
% 0.20/0.38  
% 0.20/0.38  RESULT: Unsatisfiable (the axioms are contradictory).
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