%------------------------------------------------------------------------------
% File : Drodi---4.1.1
% Problem : SET083+1 : TPTP v9.3.1. Bugfixed v5.4.0.
% Transfm : none
% Format : tptp:raw
% Command : drodi -timeout(300) /export/starexec/sandbox2/benchmark/theBenchmark.p
% Computer : n005.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 02:09:15 PM UTC 2026
% Result : Theorem 0.12s 0.38s
% Output : CNFRefutation 0.12s
% Verified :
% SZS Type : Refutation
% Derivation depth : 15
% Number of leaves : 5
% Syntax : Number of formulae : 34 ( 11 unt; 0 def)
% Number of atoms : 85 ( 42 equ)
% Maximal formula atoms : 8 ( 2 avg)
% Number of connectives : 76 ( 25 ~; 28 |; 19 &)
% ( 1 <=>; 3 =>; 0 <=; 0 <~>)
% Maximal formula depth : 9 ( 4 avg)
% Maximal term depth : 3 ( 1 avg)
% Number of predicates : 4 ( 2 usr; 1 prp; 0-2 aty)
% Number of functors : 7 ( 7 usr; 4 con; 0-2 aty)
% Number of variables : 42 ( 38 !; 4 ?)
% Comments :
%------------------------------------------------------------------------------
fof(f4,axiom,
! [U,X,Y] :
( member(U,unordered_pair(X,Y))
<=> ( ( U = Y
| U = X )
& member(U,universal_class) ) ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f6,axiom,
! [X] : singleton(X) = unordered_pair(X,X),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f16,axiom,
! [X] : ~ member(X,null_class),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f41,axiom,
! [X] :
( X != null_class
=> ? [U] :
( disjoint(U,X)
& member(U,X)
& member(U,universal_class) ) ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f44,conjecture,
! [X,Y] :
( ( member(X,universal_class)
& singleton(X) = singleton(Y) )
=> X = Y ),
file('/export/starexec/sandbox2/benchmark/theBenchmark.p') ).
fof(f45,negated_conjecture,
~ ! [X,Y] :
( ( member(X,universal_class)
& singleton(X) = singleton(Y) )
=> X = Y ),
inference(negated_conjecture,[status(cth)],[f44]) ).
fof(f59,plain,
! [U,X,Y] :
( ( ( U != Y
& U != X )
| ~ member(U,universal_class)
| member(U,unordered_pair(X,Y)) )
& ( ( ( U = Y
| U = X )
& member(U,universal_class) )
| ~ member(U,unordered_pair(X,Y)) ) ),
inference(NNF_transformation,[status(thm)],[f4]) ).
fof(f60,plain,
( ! [U,X,Y] :
( ( U != Y
& U != X )
| ~ member(U,universal_class)
| member(U,unordered_pair(X,Y)) )
& ! [U,X,Y] :
( ( ( U = Y
| U = X )
& member(U,universal_class) )
| ~ member(U,unordered_pair(X,Y)) ) ),
inference(miniscoping,[status(thm)],[f59]) ).
fof(f62,plain,
! [X0,X1,X2] :
( X0 = X2
| X0 = X1
| ~ member(X0,unordered_pair(X1,X2)) ),
inference(cnf_transformation,[status(thm)],[f60]) ).
fof(f63,plain,
! [X0,X1,X2] :
( X0 != X1
| ~ member(X0,universal_class)
| member(X0,unordered_pair(X1,X2)) ),
inference(cnf_transformation,[status(thm)],[f60]) ).
fof(f66,plain,
! [X0] : singleton(X0) = unordered_pair(X0,X0),
inference(cnf_transformation,[status(thm)],[f6]) ).
fof(f96,plain,
! [X0] : ~ member(X0,null_class),
inference(cnf_transformation,[status(thm)],[f16]) ).
fof(f181,plain,
! [X] :
( ? [U] :
( disjoint(U,X)
& member(U,X)
& member(U,universal_class) )
| X = null_class ),
inference(pre_NNF_transformation,[status(thm)],[f41]) ).
fof(f182,plain,
! [X] :
( ( disjoint(sK5_skl(X),X)
& member(sK5_skl(X),X)
& member(sK5_skl(X),universal_class) )
| X = null_class ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK5_skl]),skolemize(U,sK5_skl(X))],[f181]) ).
fof(f184,plain,
! [X0] :
( member(sK5_skl(X0),X0)
| X0 = null_class ),
inference(cnf_transformation,[status(thm)],[f182]) ).
fof(f191,plain,
? [X,Y] :
( X != Y
& member(X,universal_class)
& singleton(X) = singleton(Y) ),
inference(pre_NNF_transformation,[status(thm)],[f45]) ).
fof(f192,plain,
( sK7_skl != sK8_skl
& member(sK7_skl,universal_class)
& singleton(sK7_skl) = singleton(sK8_skl) ),
inference(skolemize,[status(esa),new_symbols(skolem,[sK7_skl,sK8_skl]),skolemize(X,sK7_skl),skolemize(Y,sK8_skl)],[f191]) ).
fof(f193,plain,
singleton(sK7_skl) = singleton(sK8_skl),
inference(cnf_transformation,[status(thm)],[f192]) ).
fof(f194,plain,
member(sK7_skl,universal_class),
inference(cnf_transformation,[status(thm)],[f192]) ).
fof(f195,plain,
sK7_skl != sK8_skl,
inference(cnf_transformation,[status(thm)],[f192]) ).
fof(f198,plain,
! [X0,X1] :
( ~ member(X0,universal_class)
| member(X0,unordered_pair(X0,X1)) ),
inference(destructive_equality_resolution,[status(thm)],[f63]) ).
fof(f212,plain,
! [X0,X1] :
( X0 = X1
| X0 = X1
| ~ member(X0,singleton(X1)) ),
inference(paramodulation,[status(thm)],[f66,f62]) ).
fof(f213,plain,
! [X0,X1] :
( X0 = X1
| ~ member(X0,singleton(X1)) ),
inference(duplicate_literals_removal,[status(thm)],[f212]) ).
fof(f221,plain,
! [X0] :
( ~ member(X0,universal_class)
| member(X0,singleton(X0)) ),
inference(paramodulation,[status(thm)],[f66,f198]) ).
fof(f229,plain,
! [X0] :
( X0 = sK7_skl
| ~ member(X0,singleton(sK8_skl)) ),
inference(paramodulation,[status(thm)],[f193,f213]) ).
fof(f247,plain,
( singleton(sK8_skl) = null_class
| sK5_skl(singleton(sK8_skl)) = sK7_skl ),
inference(resolution,[status(thm)],[f229,f184]) ).
fof(f253,plain,
( singleton(sK8_skl) = null_class
| member(sK7_skl,singleton(sK8_skl))
| singleton(sK8_skl) = null_class ),
inference(paramodulation,[status(thm)],[f247,f184]) ).
fof(f255,plain,
( member(sK7_skl,singleton(sK8_skl))
| singleton(sK8_skl) = null_class ),
inference(duplicate_literals_removal,[status(thm)],[f253]) ).
fof(f261,plain,
( sK7_skl = sK8_skl
| singleton(sK8_skl) = null_class ),
inference(resolution,[status(thm)],[f255,f213]) ).
fof(f262,plain,
singleton(sK8_skl) = null_class,
inference(forward_subsumption_resolution,[status(thm)],[f261,f195]) ).
fof(f279,plain,
singleton(sK7_skl) = null_class,
inference(backward_demodulation,[status(thm)],[f262,f193]) ).
fof(f513,plain,
( ~ member(sK7_skl,universal_class)
| member(sK7_skl,null_class) ),
inference(paramodulation,[status(thm)],[f279,f221]) ).
fof(f515,plain,
~ member(sK7_skl,universal_class),
inference(forward_subsumption_resolution,[status(thm)],[f513,f96]) ).
fof(f517,plain,
$false,
inference(forward_subsumption_resolution,[status(thm)],[f515,f194]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.03 % Problem : SET083+1 : TPTP v9.3.1. Bugfixed v5.4.0.
% 0.00/0.04 % Command : drodi -timeout(300) /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.08/0.35 % Computer : n005.cluster.edu
% 0.08/0.35 % Model : x86_64 x86_64
% 0.08/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.08/0.35 % Memory : 8046.5625MB
% 0.08/0.35 % OS : Linux 6.8.0-71-generic
% 0.08/0.35 % CPULimit : 300
% 0.08/0.35 % WCLimit : 300
% 0.08/0.35 % DateTime : Mon Sep 21 04:50:49 UTC 2026
% 0.08/0.35 % CPUTime :
% 0.12/0.36 % Drodi V4.1.1
% 0.12/0.38 % Refutation found
% 0.12/0.38 % SZS status Theorem for theBenchmark: Theorem is valid
% 0.12/0.38 % SZS output start CNFRefutation for theBenchmark
% See solution above
% 0.12/0.40 % Elapsed time: 0.047972 seconds
% 0.12/0.40 % CPU time: 0.136102 seconds
% 0.12/0.40 % Total memory used: 27.694 MB
% 0.12/0.40 % Net memory used: 27.549 MB
%------------------------------------------------------------------------------