%------------------------------------------------------------------------------
% File : Drodi---4.1.1
% Problem : GRP552-1 : TPTP v9.3.1. Bugfixed v2.7.0.
% Transfm : none
% Format : tptp:raw
% Command : drodi -timeout(300) /export/starexec/sandbox2/benchmark/theBenchmark.p
% Computer : n004.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8046.5625MB
% OS : Linux 6.8.0-71-generic
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Thu Sep 24 12:34:39 PM UTC 2026
% Result : Unsatisfiable 0.12s 0.37s
% Output : CNFRefutation 0.12s
% Verified :
% SZS Type : Refutation
% Derivation depth : 19
% Number of leaves : 5
% Syntax : Number of formulae : 39 ( 39 unt; 0 def)
% Number of atoms : 39 ( 38 equ)
% Maximal formula atoms : 1 ( 1 avg)
% Number of connectives : 2 ( 2 ~; 0 |; 0 &)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 4 ( 2 avg)
% Maximal term depth : 5 ( 2 avg)
% Number of predicates : 2 ( 0 usr; 1 prp; 0-2 aty)
% Number of functors : 6 ( 6 usr; 3 con; 0-2 aty)
% Number of variables : 49 ( 49 !; 0 ?)
% Comments :
%------------------------------------------------------------------------------
fof(f1,axiom,
! [A,B,C] : divide(divide(identity,A),divide(divide(divide(B,A),C),B)) = C,
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f2,axiom,
! [A,B] : multiply(A,B) = divide(A,divide(identity,B)),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f3,axiom,
! [A] : inverse(A) = divide(identity,A),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f4,axiom,
! [A] : identity = divide(A,A),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f5,negated_conjecture,
multiply(a,b) != multiply(b,a),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f6,plain,
! [X0,X1,X2] : divide(divide(identity,X0),divide(divide(divide(X1,X0),X2),X1)) = X2,
inference(cnf_transformation,[status(thm)],[f1]) ).
fof(f7,plain,
! [X0,X1] : multiply(X0,X1) = divide(X0,divide(identity,X1)),
inference(cnf_transformation,[status(thm)],[f2]) ).
fof(f8,plain,
! [X0] : inverse(X0) = divide(identity,X0),
inference(cnf_transformation,[status(thm)],[f3]) ).
fof(f9,plain,
! [X0] : identity = divide(X0,X0),
inference(cnf_transformation,[status(thm)],[f4]) ).
fof(f10,plain,
multiply(a,b) != multiply(b,a),
inference(cnf_transformation,[status(thm)],[f5]) ).
fof(f17,plain,
! [X0] : identity = multiply(divide(identity,X0),X0),
inference(paramodulation,[status(thm)],[f7,f9]) ).
fof(f19,plain,
! [X0] : multiply(X0,identity) = divide(X0,identity),
inference(paramodulation,[status(thm)],[f9,f7]) ).
fof(f36,plain,
! [X0] : identity = multiply(inverse(X0),X0),
inference(backward_demodulation,[status(thm)],[f8,f17]) ).
fof(f38,plain,
! [X0,X1] : multiply(X0,X1) = divide(X0,inverse(X1)),
inference(backward_demodulation,[status(thm)],[f8,f7]) ).
fof(f39,plain,
inverse(identity) = identity,
inference(paramodulation,[status(thm)],[f9,f8]) ).
fof(f43,plain,
! [X0] : multiply(identity,X0) = inverse(inverse(X0)),
inference(paramodulation,[status(thm)],[f8,f38]) ).
fof(f49,plain,
! [X0] : identity = multiply(multiply(identity,X0),inverse(X0)),
inference(paramodulation,[status(thm)],[f43,f36]) ).
fof(f51,plain,
! [X0] : identity = multiply(multiply(identity,inverse(X0)),multiply(identity,X0)),
inference(paramodulation,[status(thm)],[f43,f49]) ).
fof(f145,plain,
! [X0,X1,X2] : divide(inverse(X0),divide(divide(divide(X1,X0),X2),X1)) = X2,
inference(forward_demodulation,[status(thm)],[f8,f6]) ).
fof(f153,plain,
! [X0,X1] : divide(inverse(X0),divide(identity,X1)) = divide(X1,X0),
inference(paramodulation,[status(thm)],[f9,f145]) ).
fof(f162,plain,
! [X0,X1] : divide(inverse(X0),inverse(X1)) = divide(X1,X0),
inference(forward_demodulation,[status(thm)],[f8,f153]) ).
fof(f163,plain,
! [X0,X1] : multiply(inverse(X0),X1) = divide(X1,X0),
inference(forward_demodulation,[status(thm)],[f38,f162]) ).
fof(f169,plain,
! [X0] : divide(inverse(X0),identity) = divide(identity,X0),
inference(paramodulation,[status(thm)],[f19,f163]) ).
fof(f170,plain,
! [X0] : multiply(identity,X0) = divide(X0,identity),
inference(paramodulation,[status(thm)],[f39,f163]) ).
fof(f174,plain,
! [X0] : divide(inverse(X0),identity) = inverse(X0),
inference(forward_demodulation,[status(thm)],[f8,f169]) ).
fof(f187,plain,
! [X0] : identity = multiply(divide(inverse(X0),identity),multiply(identity,X0)),
inference(backward_demodulation,[status(thm)],[f170,f51]) ).
fof(f191,plain,
! [X0] : divide(X0,identity) = inverse(inverse(X0)),
inference(backward_demodulation,[status(thm)],[f170,f43]) ).
fof(f194,plain,
! [X0] : identity = multiply(inverse(X0),multiply(identity,X0)),
inference(forward_demodulation,[status(thm)],[f174,f187]) ).
fof(f195,plain,
! [X0] : identity = divide(multiply(identity,X0),X0),
inference(forward_demodulation,[status(thm)],[f163,f194]) ).
fof(f196,plain,
! [X0] : identity = divide(divide(X0,identity),X0),
inference(forward_demodulation,[status(thm)],[f170,f195]) ).
fof(f214,plain,
! [X0] : divide(inverse(identity),divide(identity,X0)) = X0,
inference(paramodulation,[status(thm)],[f196,f145]) ).
fof(f227,plain,
! [X0] : divide(identity,divide(identity,X0)) = X0,
inference(forward_demodulation,[status(thm)],[f39,f214]) ).
fof(f228,plain,
! [X0] : inverse(divide(identity,X0)) = X0,
inference(forward_demodulation,[status(thm)],[f8,f227]) ).
fof(f229,plain,
! [X0] : inverse(inverse(X0)) = X0,
inference(forward_demodulation,[status(thm)],[f8,f228]) ).
fof(f230,plain,
! [X0] : divide(X0,identity) = X0,
inference(forward_demodulation,[status(thm)],[f191,f229]) ).
fof(f236,plain,
! [X0] : X0 = inverse(inverse(X0)),
inference(backward_demodulation,[status(thm)],[f230,f191]) ).
fof(f251,plain,
! [X0,X1] : multiply(X0,X1) = divide(X1,inverse(X0)),
inference(paramodulation,[status(thm)],[f236,f163]) ).
fof(f254,plain,
! [X0,X1] : multiply(X0,X1) = multiply(X1,X0),
inference(forward_demodulation,[status(thm)],[f38,f251]) ).
fof(f261,plain,
$false,
inference(backward_subsumption_resolution,[status(thm)],[f10,f254]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : GRP552-1 : TPTP v9.3.1. Bugfixed v2.7.0.
% 0.00/0.04 % Command : drodi -timeout(300) /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.10/0.35 % Computer : n004.cluster.edu
% 0.10/0.35 % Model : x86_64 x86_64
% 0.10/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.10/0.35 % Memory : 8046.5625MB
% 0.10/0.35 % OS : Linux 6.8.0-71-generic
% 0.10/0.35 % CPULimit : 300
% 0.10/0.35 % WCLimit : 300
% 0.10/0.35 % DateTime : Sun Sep 20 20:16:35 UTC 2026
% 0.12/0.36 % CPUTime :
% 0.12/0.36 % Drodi V4.1.1
% 0.12/0.37 % Refutation found
% 0.12/0.37 % SZS status Unsatisfiable for theBenchmark: Theory is unsatisfiable
% 0.12/0.37 % SZS output start CNFRefutation for theBenchmark
% See solution above
% 0.12/0.39 % Elapsed time: 0.023881 seconds
% 0.12/0.39 % CPU time: 0.050380 seconds
% 0.12/0.39 % Total memory used: 2.281 MB
% 0.12/0.39 % Net memory used: 2.224 MB
%------------------------------------------------------------------------------