TSTP Solution File: SET083-7 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : SET083-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n028.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  : 0s
% DateTime : Mon Jul 18 22:46:46 EDT 2022

% Result   : Unsatisfiable 2.20s 2.61s
% Output   : Refutation 2.20s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.02/0.15  % Problem  : SET083-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% 0.02/0.16  % Command  : bliksem %s
% 0.12/0.35  % Computer : n028.cluster.edu
% 0.12/0.35  % Model    : x86_64 x86_64
% 0.12/0.35  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.35  % Memory   : 8042.1875MB
% 0.12/0.35  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.35  % CPULimit : 300
% 0.12/0.35  % DateTime : Sun Jul 10 16:39:12 EDT 2022
% 0.12/0.35  % CPUTime  : 
% 0.53/0.93  *** allocated 10000 integers for termspace/termends
% 0.53/0.93  *** allocated 10000 integers for clauses
% 0.53/0.93  *** allocated 10000 integers for justifications
% 0.53/0.93  Bliksem 1.12
% 0.53/0.93  
% 0.53/0.93  
% 0.53/0.93  Automatic Strategy Selection
% 0.53/0.93  
% 0.53/0.93  Clauses:
% 0.53/0.93  [
% 0.53/0.93     [ ~( subclass( X, Y ) ), ~( member( Z, X ) ), member( Z, Y ) ],
% 0.53/0.93     [ member( 'not_subclass_element'( X, Y ), X ), subclass( X, Y ) ],
% 0.53/0.93     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), subclass( X, Y ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ subclass( X, 'universal_class' ) ],
% 0.53/0.93     [ ~( =( X, Y ) ), subclass( X, Y ) ],
% 0.53/0.93     [ ~( =( X, Y ) ), subclass( Y, X ) ],
% 0.53/0.93     [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ],
% 0.53/0.93     [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), =( X, Z ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), member( X, 'unordered_pair'( X, Y
% 0.53/0.93     ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), member( X, 'unordered_pair'( Y, X
% 0.53/0.93     ) ) ],
% 0.53/0.93     [ member( 'unordered_pair'( X, Y ), 'universal_class' ) ],
% 0.53/0.93     [ =( 'unordered_pair'( X, X ), singleton( X ) ) ],
% 0.53/0.93     [ =( 'unordered_pair'( singleton( X ), 'unordered_pair'( X, singleton( Y
% 0.53/0.93     ) ) ), 'ordered_pair'( X, Y ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    X, Z ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    Y, T ) ],
% 0.53/0.93     [ ~( member( X, Y ) ), ~( member( Z, T ) ), member( 'ordered_pair'( X, Z
% 0.53/0.93     ), 'cross_product'( Y, T ) ) ],
% 0.53/0.93     [ ~( member( X, 'cross_product'( Y, Z ) ) ), =( 'ordered_pair'( first( X
% 0.53/0.93     ), second( X ) ), X ) ],
% 0.53/0.93     [ subclass( 'element_relation', 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'element_relation' ) ), member( X, 
% 0.53/0.93    Y ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( 'universal_class'
% 0.53/0.93    , 'universal_class' ) ) ), ~( member( X, Y ) ), member( 'ordered_pair'( X
% 0.53/0.93    , Y ), 'element_relation' ) ],
% 0.53/0.93     [ ~( member( X, intersection( Y, Z ) ) ), member( X, Y ) ],
% 0.53/0.93     [ ~( member( X, intersection( Y, Z ) ) ), member( X, Z ) ],
% 0.53/0.93     [ ~( member( X, Y ) ), ~( member( X, Z ) ), member( X, intersection( Y, 
% 0.53/0.93    Z ) ) ],
% 0.53/0.93     [ ~( member( X, complement( Y ) ) ), ~( member( X, Y ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), member( X, complement( Y ) ), 
% 0.53/0.93    member( X, Y ) ],
% 0.53/0.93     [ =( complement( intersection( complement( X ), complement( Y ) ) ), 
% 0.53/0.93    union( X, Y ) ) ],
% 0.53/0.93     [ =( intersection( complement( intersection( X, Y ) ), complement( 
% 0.53/0.93    intersection( complement( X ), complement( Y ) ) ) ), 
% 0.53/0.93    'symmetric_difference'( X, Y ) ) ],
% 0.53/0.93     [ =( intersection( X, 'cross_product'( Y, Z ) ), restrict( X, Y, Z ) ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ =( intersection( 'cross_product'( X, Y ), Z ), restrict( Z, X, Y ) ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ ~( =( restrict( X, singleton( Y ), 'universal_class' ), 'null_class' )
% 0.53/0.93     ), ~( member( Y, 'domain_of'( X ) ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), =( restrict( Y, singleton( X ), 
% 0.53/0.93    'universal_class' ), 'null_class' ), member( X, 'domain_of'( Y ) ) ],
% 0.53/0.93     [ subclass( rotate( X ), 'cross_product'( 'cross_product'( 
% 0.53/0.93    'universal_class', 'universal_class' ), 'universal_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), rotate( T ) )
% 0.53/0.93     ), member( 'ordered_pair'( 'ordered_pair'( Y, Z ), X ), T ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), T ) ), ~( 
% 0.53/0.93    member( 'ordered_pair'( 'ordered_pair'( Z, X ), Y ), 'cross_product'( 
% 0.53/0.93    'cross_product'( 'universal_class', 'universal_class' ), 
% 0.53/0.93    'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Z, X ), 
% 0.53/0.93    Y ), rotate( T ) ) ],
% 0.53/0.93     [ subclass( flip( X ), 'cross_product'( 'cross_product'( 
% 0.53/0.93    'universal_class', 'universal_class' ), 'universal_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), flip( T ) ) )
% 0.53/0.93    , member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), T ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), T ) ), ~( 
% 0.53/0.93    member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), 'cross_product'( 
% 0.53/0.93    'cross_product'( 'universal_class', 'universal_class' ), 
% 0.53/0.93    'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X ), 
% 0.53/0.93    Z ), flip( T ) ) ],
% 0.53/0.93     [ =( 'domain_of'( flip( 'cross_product'( X, 'universal_class' ) ) ), 
% 0.53/0.93    inverse( X ) ) ],
% 0.53/0.93     [ =( 'domain_of'( inverse( X ) ), 'range_of'( X ) ) ],
% 0.53/0.93     [ =( first( 'not_subclass_element'( restrict( X, Y, singleton( Z ) ), 
% 0.53/0.93    'null_class' ) ), domain( X, Y, Z ) ) ],
% 0.53/0.93     [ =( second( 'not_subclass_element'( restrict( X, singleton( Y ), Z ), 
% 0.53/0.93    'null_class' ) ), range( X, Y, Z ) ) ],
% 0.53/0.93     [ =( 'range_of'( restrict( X, Y, 'universal_class' ) ), image( X, Y ) )
% 0.53/0.93     ],
% 0.53/0.93     [ =( union( X, singleton( X ) ), successor( X ) ) ],
% 0.53/0.93     [ subclass( 'successor_relation', 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'successor_relation' ) ), =( 
% 0.53/0.93    successor( X ), Y ) ],
% 0.53/0.93     [ ~( =( successor( X ), Y ) ), ~( member( 'ordered_pair'( X, Y ), 
% 0.53/0.93    'cross_product'( 'universal_class', 'universal_class' ) ) ), member( 
% 0.53/0.93    'ordered_pair'( X, Y ), 'successor_relation' ) ],
% 0.53/0.93     [ ~( inductive( X ) ), member( 'null_class', X ) ],
% 0.53/0.93     [ ~( inductive( X ) ), subclass( image( 'successor_relation', X ), X ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ ~( member( 'null_class', X ) ), ~( subclass( image( 
% 0.53/0.93    'successor_relation', X ), X ) ), inductive( X ) ],
% 0.53/0.93     [ inductive( omega ) ],
% 0.53/0.93     [ ~( inductive( X ) ), subclass( omega, X ) ],
% 0.53/0.93     [ member( omega, 'universal_class' ) ],
% 0.53/0.93     [ =( 'domain_of'( restrict( 'element_relation', 'universal_class', X ) )
% 0.53/0.93    , 'sum_class'( X ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), member( 'sum_class'( X ), 
% 0.53/0.93    'universal_class' ) ],
% 0.53/0.93     [ =( complement( image( 'element_relation', complement( X ) ) ), 
% 0.53/0.93    'power_class'( X ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), member( 'power_class'( X ), 
% 0.53/0.93    'universal_class' ) ],
% 0.53/0.93     [ subclass( compose( X, Y ), 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), compose( Z, T ) ) ), member( Y, 
% 0.53/0.93    image( Z, image( T, singleton( X ) ) ) ) ],
% 0.53/0.93     [ ~( member( X, image( Y, image( Z, singleton( T ) ) ) ) ), ~( member( 
% 0.53/0.93    'ordered_pair'( T, X ), 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ), member( 'ordered_pair'( T, X ), compose( Y, Z )
% 0.53/0.93     ) ],
% 0.53/0.93     [ ~( 'single_valued_class'( X ) ), subclass( compose( X, inverse( X ) )
% 0.53/0.93    , 'identity_relation' ) ],
% 0.53/0.93     [ ~( subclass( compose( X, inverse( X ) ), 'identity_relation' ) ), 
% 0.53/0.93    'single_valued_class'( X ) ],
% 0.53/0.93     [ ~( function( X ) ), subclass( X, 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ],
% 0.53/0.93     [ ~( function( X ) ), subclass( compose( X, inverse( X ) ), 
% 0.53/0.93    'identity_relation' ) ],
% 0.53/0.93     [ ~( subclass( X, 'cross_product'( 'universal_class', 'universal_class'
% 0.53/0.93     ) ) ), ~( subclass( compose( X, inverse( X ) ), 'identity_relation' ) )
% 0.53/0.93    , function( X ) ],
% 0.53/0.93     [ ~( function( X ) ), ~( member( Y, 'universal_class' ) ), member( image( 
% 0.53/0.93    X, Y ), 'universal_class' ) ],
% 0.53/0.93     [ =( X, 'null_class' ), member( regular( X ), X ) ],
% 0.53/0.93     [ =( X, 'null_class' ), =( intersection( X, regular( X ) ), 'null_class'
% 0.53/0.93     ) ],
% 0.53/0.93     [ =( 'sum_class'( image( X, singleton( Y ) ) ), apply( X, Y ) ) ],
% 0.53/0.93     [ function( choice ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), =( X, 'null_class' ), member( 
% 0.53/0.93    apply( choice, X ), X ) ],
% 0.53/0.93     [ ~( 'one_to_one'( X ) ), function( X ) ],
% 0.53/0.93     [ ~( 'one_to_one'( X ) ), function( inverse( X ) ) ],
% 0.53/0.93     [ ~( function( inverse( X ) ) ), ~( function( X ) ), 'one_to_one'( X ) ]
% 0.53/0.93    ,
% 0.53/0.93     [ =( intersection( 'cross_product'( 'universal_class', 'universal_class'
% 0.53/0.93     ), intersection( 'cross_product'( 'universal_class', 'universal_class' )
% 0.53/0.93    , complement( compose( complement( 'element_relation' ), inverse( 
% 0.53/0.93    'element_relation' ) ) ) ) ), 'subset_relation' ) ],
% 0.53/0.93     [ =( intersection( inverse( 'subset_relation' ), 'subset_relation' ), 
% 0.53/0.93    'identity_relation' ) ],
% 0.53/0.93     [ =( complement( 'domain_of'( intersection( X, 'identity_relation' ) ) )
% 0.53/0.93    , diagonalise( X ) ) ],
% 0.53/0.93     [ =( intersection( 'domain_of'( X ), diagonalise( compose( inverse( 
% 0.53/0.93    'element_relation' ), X ) ) ), cantor( X ) ) ],
% 0.53/0.93     [ ~( operation( X ) ), function( X ) ],
% 0.53/0.93     [ ~( operation( X ) ), =( 'cross_product'( 'domain_of'( 'domain_of'( X )
% 0.53/0.93     ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) ) ],
% 0.53/0.93     [ ~( operation( X ) ), subclass( 'range_of'( X ), 'domain_of'( 
% 0.53/0.93    'domain_of'( X ) ) ) ],
% 0.53/0.93     [ ~( function( X ) ), ~( =( 'cross_product'( 'domain_of'( 'domain_of'( X
% 0.53/0.93     ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) ) ), ~( 
% 0.53/0.93    subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( X ) ) ) ), operation( 
% 0.53/0.93    X ) ],
% 0.53/0.93     [ ~( compatible( X, Y, Z ) ), function( X ) ],
% 0.53/0.93     [ ~( compatible( X, Y, Z ) ), =( 'domain_of'( 'domain_of'( Y ) ), 
% 0.53/0.93    'domain_of'( X ) ) ],
% 0.53/0.93     [ ~( compatible( X, Y, Z ) ), subclass( 'range_of'( X ), 'domain_of'( 
% 0.53/0.93    'domain_of'( Z ) ) ) ],
% 0.53/0.93     [ ~( function( X ) ), ~( =( 'domain_of'( 'domain_of'( Y ) ), 'domain_of'( 
% 0.53/0.93    X ) ) ), ~( subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( Z ) ) )
% 0.53/0.93     ), compatible( X, Y, Z ) ],
% 0.53/0.93     [ ~( homomorphism( X, Y, Z ) ), operation( Y ) ],
% 0.53/0.93     [ ~( homomorphism( X, Y, Z ) ), operation( Z ) ],
% 0.53/0.93     [ ~( homomorphism( X, Y, Z ) ), compatible( X, Y, Z ) ],
% 0.53/0.93     [ ~( homomorphism( X, Y, Z ) ), ~( member( 'ordered_pair'( T, U ), 
% 0.53/0.93    'domain_of'( Y ) ) ), =( apply( Z, 'ordered_pair'( apply( X, T ), apply( 
% 0.53/0.93    X, U ) ) ), apply( X, apply( Y, 'ordered_pair'( T, U ) ) ) ) ],
% 0.53/0.93     [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( Z, X, Y ) ), 
% 0.53/0.93    member( 'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 
% 0.53/0.93    'not_homomorphism2'( Z, X, Y ) ), 'domain_of'( X ) ), homomorphism( Z, X
% 0.53/0.93    , Y ) ],
% 0.53/0.93     [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( Z, X, Y ) ), 
% 0.53/0.93    ~( =( apply( Y, 'ordered_pair'( apply( Z, 'not_homomorphism1'( Z, X, Y )
% 0.53/0.93     ), apply( Z, 'not_homomorphism2'( Z, X, Y ) ) ) ), apply( Z, apply( X, 
% 0.53/0.93    'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 'not_homomorphism2'( Z, X
% 0.53/0.93    , Y ) ) ) ) ) ), homomorphism( Z, X, Y ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    X, 'unordered_pair'( X, Y ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    Y, 'unordered_pair'( X, Y ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    X, 'universal_class' ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.53/0.93    Y, 'universal_class' ) ],
% 0.53/0.93     [ subclass( X, X ) ],
% 0.53/0.93     [ ~( subclass( X, Y ) ), ~( subclass( Y, Z ) ), subclass( X, Z ) ],
% 0.53/0.93     [ =( X, Y ), member( 'not_subclass_element'( X, Y ), X ), member( 
% 0.53/0.93    'not_subclass_element'( Y, X ), Y ) ],
% 0.53/0.93     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( X, Y ), member( 
% 0.53/0.93    'not_subclass_element'( Y, X ), Y ) ],
% 0.53/0.93     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( Y, X ), member( 
% 0.53/0.93    'not_subclass_element'( Y, X ), Y ) ],
% 0.53/0.93     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), ~( member( 
% 0.53/0.93    'not_subclass_element'( Y, X ), X ) ), =( X, Y ) ],
% 0.53/0.93     [ ~( member( X, intersection( complement( Y ), Y ) ) ) ],
% 0.53/0.93     [ ~( member( X, 'null_class' ) ) ],
% 0.53/0.93     [ subclass( 'null_class', X ) ],
% 0.53/0.93     [ ~( subclass( X, 'null_class' ) ), =( X, 'null_class' ) ],
% 0.53/0.93     [ =( X, 'null_class' ), member( 'not_subclass_element'( X, 'null_class'
% 0.53/0.93     ), X ) ],
% 0.53/0.93     [ member( 'null_class', 'universal_class' ) ],
% 0.53/0.93     [ =( 'unordered_pair'( X, Y ), 'unordered_pair'( Y, X ) ) ],
% 0.53/0.93     [ subclass( singleton( X ), 'unordered_pair'( X, Y ) ) ],
% 0.53/0.93     [ subclass( singleton( X ), 'unordered_pair'( Y, X ) ) ],
% 0.53/0.93     [ member( X, 'universal_class' ), =( 'unordered_pair'( Y, X ), singleton( 
% 0.53/0.93    Y ) ) ],
% 0.53/0.93     [ member( X, 'universal_class' ), =( 'unordered_pair'( X, Y ), singleton( 
% 0.53/0.93    Y ) ) ],
% 0.53/0.93     [ =( 'unordered_pair'( X, Y ), 'null_class' ), member( X, 
% 0.53/0.93    'universal_class' ), member( Y, 'universal_class' ) ],
% 0.53/0.93     [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( X, Z ) ) ), ~( 
% 0.53/0.93    member( 'ordered_pair'( Y, Z ), 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ), =( Y, Z ) ],
% 0.53/0.93     [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( Z, Y ) ) ), ~( 
% 0.53/0.93    member( 'ordered_pair'( X, Z ), 'cross_product'( 'universal_class', 
% 0.53/0.93    'universal_class' ) ) ), =( X, Z ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), ~( =( 'unordered_pair'( X, Y ), 
% 0.53/0.93    'null_class' ) ) ],
% 0.53/0.93     [ ~( member( X, 'universal_class' ) ), ~( =( 'unordered_pair'( Y, X ), 
% 0.53/0.93    'null_class' ) ) ],
% 0.53/0.93     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), ~( =( 
% 0.53/0.93    'unordered_pair'( X, Y ), 'null_class' ) ) ],
% 2.20/2.61     [ ~( member( X, Y ) ), ~( member( Z, Y ) ), subclass( 'unordered_pair'( 
% 2.20/2.61    X, Z ), Y ) ],
% 2.20/2.61     [ member( singleton( X ), 'universal_class' ) ],
% 2.20/2.61     [ member( singleton( X ), 'unordered_pair'( Y, singleton( X ) ) ) ],
% 2.20/2.61     [ ~( member( X, 'universal_class' ) ), member( X, singleton( X ) ) ]
% 2.20/2.61    ,
% 2.20/2.61     [ ~( member( X, 'universal_class' ) ), ~( =( singleton( X ), 
% 2.20/2.61    'null_class' ) ) ],
% 2.20/2.61     [ member( 'null_class', singleton( 'null_class' ) ) ],
% 2.20/2.61     [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ],
% 2.20/2.61     [ member( X, 'universal_class' ), =( singleton( X ), 'null_class' ) ]
% 2.20/2.61    ,
% 2.20/2.61     [ =( singleton( x ), singleton( y ) ) ],
% 2.20/2.61     [ member( x, 'universal_class' ) ],
% 2.20/2.61     [ ~( =( x, y ) ) ]
% 2.20/2.61  ] .
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  percentage equality = 0.242063, percentage horn = 0.875969
% 2.20/2.61  This is a problem with some equality
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Options Used:
% 2.20/2.61  
% 2.20/2.61  useres =            1
% 2.20/2.61  useparamod =        1
% 2.20/2.61  useeqrefl =         1
% 2.20/2.61  useeqfact =         1
% 2.20/2.61  usefactor =         1
% 2.20/2.61  usesimpsplitting =  0
% 2.20/2.61  usesimpdemod =      5
% 2.20/2.61  usesimpres =        3
% 2.20/2.61  
% 2.20/2.61  resimpinuse      =  1000
% 2.20/2.61  resimpclauses =     20000
% 2.20/2.61  substype =          eqrewr
% 2.20/2.61  backwardsubs =      1
% 2.20/2.61  selectoldest =      5
% 2.20/2.61  
% 2.20/2.61  litorderings [0] =  split
% 2.20/2.61  litorderings [1] =  extend the termordering, first sorting on arguments
% 2.20/2.61  
% 2.20/2.61  termordering =      kbo
% 2.20/2.61  
% 2.20/2.61  litapriori =        0
% 2.20/2.61  termapriori =       1
% 2.20/2.61  litaposteriori =    0
% 2.20/2.61  termaposteriori =   0
% 2.20/2.61  demodaposteriori =  0
% 2.20/2.61  ordereqreflfact =   0
% 2.20/2.61  
% 2.20/2.61  litselect =         negord
% 2.20/2.61  
% 2.20/2.61  maxweight =         15
% 2.20/2.61  maxdepth =          30000
% 2.20/2.61  maxlength =         115
% 2.20/2.61  maxnrvars =         195
% 2.20/2.61  excuselevel =       1
% 2.20/2.61  increasemaxweight = 1
% 2.20/2.61  
% 2.20/2.61  maxselected =       10000000
% 2.20/2.61  maxnrclauses =      10000000
% 2.20/2.61  
% 2.20/2.61  showgenerated =    0
% 2.20/2.61  showkept =         0
% 2.20/2.61  showselected =     0
% 2.20/2.61  showdeleted =      0
% 2.20/2.61  showresimp =       1
% 2.20/2.61  showstatus =       2000
% 2.20/2.61  
% 2.20/2.61  prologoutput =     1
% 2.20/2.61  nrgoals =          5000000
% 2.20/2.61  totalproof =       1
% 2.20/2.61  
% 2.20/2.61  Symbols occurring in the translation:
% 2.20/2.61  
% 2.20/2.61  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 2.20/2.61  .  [1, 2]      (w:1, o:56, a:1, s:1, b:0), 
% 2.20/2.61  !  [4, 1]      (w:0, o:31, a:1, s:1, b:0), 
% 2.20/2.61  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 2.20/2.61  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 2.20/2.61  subclass  [41, 2]      (w:1, o:81, a:1, s:1, b:0), 
% 2.20/2.61  member  [43, 2]      (w:1, o:82, a:1, s:1, b:0), 
% 2.20/2.61  'not_subclass_element'  [44, 2]      (w:1, o:83, a:1, s:1, b:0), 
% 2.20/2.61  'universal_class'  [45, 0]      (w:1, o:21, a:1, s:1, b:0), 
% 2.20/2.61  'unordered_pair'  [46, 2]      (w:1, o:84, a:1, s:1, b:0), 
% 2.20/2.61  singleton  [47, 1]      (w:1, o:39, a:1, s:1, b:0), 
% 2.20/2.61  'ordered_pair'  [48, 2]      (w:1, o:85, a:1, s:1, b:0), 
% 2.20/2.61  'cross_product'  [50, 2]      (w:1, o:86, a:1, s:1, b:0), 
% 2.20/2.61  first  [52, 1]      (w:1, o:40, a:1, s:1, b:0), 
% 2.20/2.61  second  [53, 1]      (w:1, o:41, a:1, s:1, b:0), 
% 2.20/2.61  'element_relation'  [54, 0]      (w:1, o:25, a:1, s:1, b:0), 
% 2.20/2.61  intersection  [55, 2]      (w:1, o:88, a:1, s:1, b:0), 
% 2.20/2.61  complement  [56, 1]      (w:1, o:42, a:1, s:1, b:0), 
% 2.20/2.61  union  [57, 2]      (w:1, o:89, a:1, s:1, b:0), 
% 2.20/2.61  'symmetric_difference'  [58, 2]      (w:1, o:90, a:1, s:1, b:0), 
% 2.20/2.61  restrict  [60, 3]      (w:1, o:93, a:1, s:1, b:0), 
% 2.20/2.61  'null_class'  [61, 0]      (w:1, o:26, a:1, s:1, b:0), 
% 2.20/2.61  'domain_of'  [62, 1]      (w:1, o:44, a:1, s:1, b:0), 
% 2.20/2.61  rotate  [63, 1]      (w:1, o:36, a:1, s:1, b:0), 
% 2.20/2.61  flip  [65, 1]      (w:1, o:45, a:1, s:1, b:0), 
% 2.20/2.61  inverse  [66, 1]      (w:1, o:46, a:1, s:1, b:0), 
% 2.20/2.61  'range_of'  [67, 1]      (w:1, o:37, a:1, s:1, b:0), 
% 2.20/2.61  domain  [68, 3]      (w:1, o:95, a:1, s:1, b:0), 
% 2.20/2.61  range  [69, 3]      (w:1, o:96, a:1, s:1, b:0), 
% 2.20/2.61  image  [70, 2]      (w:1, o:87, a:1, s:1, b:0), 
% 2.20/2.61  successor  [71, 1]      (w:1, o:47, a:1, s:1, b:0), 
% 2.20/2.61  'successor_relation'  [72, 0]      (w:1, o:6, a:1, s:1, b:0), 
% 2.20/2.61  inductive  [73, 1]      (w:1, o:48, a:1, s:1, b:0), 
% 2.20/2.61  omega  [74, 0]      (w:1, o:9, a:1, s:1, b:0), 
% 2.20/2.61  'sum_class'  [75, 1]      (w:1, o:49, a:1, s:1, b:0), 
% 2.20/2.61  'power_class'  [76, 1]      (w:1, o:52, a:1, s:1, b:0), 
% 2.20/2.61  compose  [78, 2]      (w:1, o:91, a:1, s:1, b:0), 
% 2.20/2.61  'single_valued_class'  [79, 1]      (w:1, o:53, a:1, s:1, b:0), 
% 2.20/2.61  'identity_relation'  [80, 0]      (w:1, o:27, a:1, s:1, b:0), 
% 2.20/2.61  function  [82, 1]      (w:1, o:54, a:1, s:1, b:0), 
% 2.20/2.61  regular  [83, 1]      (w:1, o:38, a:1, s:1, b:0), 
% 2.20/2.61  apply  [84, 2]      (w:1, o:92, a:1, s:1, b:0), 
% 2.20/2.61  choice  [85, 0]      (w:1, o:28, a:1, s:1, b:0), 
% 2.20/2.61  'one_to_one'  [86, 1]      (w:1, o:50, a:1, s:1, b:0), 
% 2.20/2.61  'subset_relation'  [87, 0]      (w:1, o:5, a:1, s:1, b:0), 
% 2.20/2.61  diagonalise  [88, 1]      (w:1, o:55, a:1, s:1, b:0), 
% 2.20/2.61  cantor  [89, 1]      (w:1, o:43, a:1, s:1, b:0), 
% 2.20/2.61  operation  [90, 1]      (w:1, o:51, a:1, s:1, b:0), 
% 2.20/2.61  compatible  [94, 3]      (w:1, o:94, a:1, s:1, b:0), 
% 2.20/2.61  homomorphism  [95, 3]      (w:1, o:97, a:1, s:1, b:0), 
% 2.20/2.61  'not_homomorphism1'  [96, 3]      (w:1, o:98, a:1, s:1, b:0), 
% 2.20/2.61  'not_homomorphism2'  [97, 3]      (w:1, o:99, a:1, s:1, b:0), 
% 2.20/2.61  x  [98, 0]      (w:1, o:29, a:1, s:1, b:0), 
% 2.20/2.61  y  [99, 0]      (w:1, o:30, a:1, s:1, b:0).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Starting Search:
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    3845
% 2.20/2.61  Kept:         2022
% 2.20/2.61  Inuse:        118
% 2.20/2.61  Deleted:      2
% 2.20/2.61  Deletedinuse: 2
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    9516
% 2.20/2.61  Kept:         4222
% 2.20/2.61  Inuse:        201
% 2.20/2.61  Deleted:      8
% 2.20/2.61  Deletedinuse: 8
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    14632
% 2.20/2.61  Kept:         6225
% 2.20/2.61  Inuse:        280
% 2.20/2.61  Deleted:      12
% 2.20/2.61  Deletedinuse: 11
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    20598
% 2.20/2.61  Kept:         8250
% 2.20/2.61  Inuse:        331
% 2.20/2.61  Deleted:      56
% 2.20/2.61  Deletedinuse: 52
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    29178
% 2.20/2.61  Kept:         10998
% 2.20/2.61  Inuse:        397
% 2.20/2.61  Deleted:      71
% 2.20/2.61  Deletedinuse: 57
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    38701
% 2.20/2.61  Kept:         13007
% 2.20/2.61  Inuse:        446
% 2.20/2.61  Deleted:      73
% 2.20/2.61  Deletedinuse: 58
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Intermediate Status:
% 2.20/2.61  Generated:    45776
% 2.20/2.61  Kept:         15040
% 2.20/2.61  Inuse:        486
% 2.20/2.61  Deleted:      87
% 2.20/2.61  Deletedinuse: 71
% 2.20/2.61  
% 2.20/2.61  Resimplifying inuse:
% 2.20/2.61  Done
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  Bliksems!, er is een bewijs:
% 2.20/2.61  % SZS status Unsatisfiable
% 2.20/2.61  % SZS output start Refutation
% 2.20/2.61  
% 2.20/2.61  clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 5, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 8, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    'unordered_pair'( Y, X ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 10, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 122, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 124, [ =( singleton( y ), singleton( x ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 125, [ member( x, 'universal_class' ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 126, [ ~( =( y, x ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 159, [ =( X, Y ), ~( =( Y, X ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 459, [ member( x, 'unordered_pair'( X, x ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 491, [ member( x, singleton( x ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 600, [ ~( =( X, x ) ), ~( =( X, y ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 16362, [ ~( =( Y, X ) ), ~( =( Y, y ) ), ~( member( x, singleton( X
% 2.20/2.61     ) ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 16912, [ ~( =( X, y ) ) ] )
% 2.20/2.61  .
% 2.20/2.61  clause( 16913, [] )
% 2.20/2.61  .
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  % SZS output end Refutation
% 2.20/2.61  found a proof!
% 2.20/2.61  
% 2.20/2.61  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 2.20/2.61  
% 2.20/2.61  initialclauses(
% 2.20/2.61  [ clause( 16915, [ ~( subclass( X, Y ) ), ~( member( Z, X ) ), member( Z, Y
% 2.20/2.61     ) ] )
% 2.20/2.61  , clause( 16916, [ member( 'not_subclass_element'( X, Y ), X ), subclass( X
% 2.20/2.61    , Y ) ] )
% 2.20/2.61  , clause( 16917, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), 
% 2.20/2.61    subclass( X, Y ) ] )
% 2.20/2.61  , clause( 16918, [ subclass( X, 'universal_class' ) ] )
% 2.20/2.61  , clause( 16919, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  , clause( 16920, [ ~( =( X, Y ) ), subclass( Y, X ) ] )
% 2.20/2.61  , clause( 16921, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y )
% 2.20/2.61     ] )
% 2.20/2.61  , clause( 16922, [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), 
% 2.20/2.61    =( X, Z ) ] )
% 2.20/2.61  , clause( 16923, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    'unordered_pair'( X, Y ) ) ] )
% 2.20/2.61  , clause( 16924, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    'unordered_pair'( Y, X ) ) ] )
% 2.20/2.61  , clause( 16925, [ member( 'unordered_pair'( X, Y ), 'universal_class' ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 16926, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.20/2.61  , clause( 16927, [ =( 'unordered_pair'( singleton( X ), 'unordered_pair'( X
% 2.20/2.61    , singleton( Y ) ) ), 'ordered_pair'( X, Y ) ) ] )
% 2.20/2.61  , clause( 16928, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( X, Z ) ] )
% 2.20/2.61  , clause( 16929, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( Y, T ) ] )
% 2.20/2.61  , clause( 16930, [ ~( member( X, Y ) ), ~( member( Z, T ) ), member( 
% 2.20/2.61    'ordered_pair'( X, Z ), 'cross_product'( Y, T ) ) ] )
% 2.20/2.61  , clause( 16931, [ ~( member( X, 'cross_product'( Y, Z ) ) ), =( 
% 2.20/2.61    'ordered_pair'( first( X ), second( X ) ), X ) ] )
% 2.20/2.61  , clause( 16932, [ subclass( 'element_relation', 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16933, [ ~( member( 'ordered_pair'( X, Y ), 'element_relation' )
% 2.20/2.61     ), member( X, Y ) ] )
% 2.20/2.61  , clause( 16934, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ), ~( member( X, Y ) ), member( 
% 2.20/2.61    'ordered_pair'( X, Y ), 'element_relation' ) ] )
% 2.20/2.61  , clause( 16935, [ ~( member( X, intersection( Y, Z ) ) ), member( X, Y ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 16936, [ ~( member( X, intersection( Y, Z ) ) ), member( X, Z ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 16937, [ ~( member( X, Y ) ), ~( member( X, Z ) ), member( X, 
% 2.20/2.61    intersection( Y, Z ) ) ] )
% 2.20/2.61  , clause( 16938, [ ~( member( X, complement( Y ) ) ), ~( member( X, Y ) ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 16939, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    complement( Y ) ), member( X, Y ) ] )
% 2.20/2.61  , clause( 16940, [ =( complement( intersection( complement( X ), complement( 
% 2.20/2.61    Y ) ) ), union( X, Y ) ) ] )
% 2.20/2.61  , clause( 16941, [ =( intersection( complement( intersection( X, Y ) ), 
% 2.20/2.61    complement( intersection( complement( X ), complement( Y ) ) ) ), 
% 2.20/2.61    'symmetric_difference'( X, Y ) ) ] )
% 2.20/2.61  , clause( 16942, [ =( intersection( X, 'cross_product'( Y, Z ) ), restrict( 
% 2.20/2.61    X, Y, Z ) ) ] )
% 2.20/2.61  , clause( 16943, [ =( intersection( 'cross_product'( X, Y ), Z ), restrict( 
% 2.20/2.61    Z, X, Y ) ) ] )
% 2.20/2.61  , clause( 16944, [ ~( =( restrict( X, singleton( Y ), 'universal_class' ), 
% 2.20/2.61    'null_class' ) ), ~( member( Y, 'domain_of'( X ) ) ) ] )
% 2.20/2.61  , clause( 16945, [ ~( member( X, 'universal_class' ) ), =( restrict( Y, 
% 2.20/2.61    singleton( X ), 'universal_class' ), 'null_class' ), member( X, 
% 2.20/2.61    'domain_of'( Y ) ) ] )
% 2.20/2.61  , clause( 16946, [ subclass( rotate( X ), 'cross_product'( 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ), 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16947, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.20/2.61    rotate( T ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, Z ), X ), T )
% 2.20/2.61     ] )
% 2.20/2.61  , clause( 16948, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.20/2.61    T ) ), ~( member( 'ordered_pair'( 'ordered_pair'( Z, X ), Y ), 
% 2.20/2.61    'cross_product'( 'cross_product'( 'universal_class', 'universal_class' )
% 2.20/2.61    , 'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Z, X )
% 2.20/2.61    , Y ), rotate( T ) ) ] )
% 2.20/2.61  , clause( 16949, [ subclass( flip( X ), 'cross_product'( 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ), 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16950, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.20/2.61    flip( T ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), T ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 16951, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.20/2.61    T ) ), ~( member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), 
% 2.20/2.61    'cross_product'( 'cross_product'( 'universal_class', 'universal_class' )
% 2.20/2.61    , 'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X )
% 2.20/2.61    , Z ), flip( T ) ) ] )
% 2.20/2.61  , clause( 16952, [ =( 'domain_of'( flip( 'cross_product'( X, 
% 2.20/2.61    'universal_class' ) ) ), inverse( X ) ) ] )
% 2.20/2.61  , clause( 16953, [ =( 'domain_of'( inverse( X ) ), 'range_of'( X ) ) ] )
% 2.20/2.61  , clause( 16954, [ =( first( 'not_subclass_element'( restrict( X, Y, 
% 2.20/2.61    singleton( Z ) ), 'null_class' ) ), domain( X, Y, Z ) ) ] )
% 2.20/2.61  , clause( 16955, [ =( second( 'not_subclass_element'( restrict( X, 
% 2.20/2.61    singleton( Y ), Z ), 'null_class' ) ), range( X, Y, Z ) ) ] )
% 2.20/2.61  , clause( 16956, [ =( 'range_of'( restrict( X, Y, 'universal_class' ) ), 
% 2.20/2.61    image( X, Y ) ) ] )
% 2.20/2.61  , clause( 16957, [ =( union( X, singleton( X ) ), successor( X ) ) ] )
% 2.20/2.61  , clause( 16958, [ subclass( 'successor_relation', 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16959, [ ~( member( 'ordered_pair'( X, Y ), 'successor_relation'
% 2.20/2.61     ) ), =( successor( X ), Y ) ] )
% 2.20/2.61  , clause( 16960, [ ~( =( successor( X ), Y ) ), ~( member( 'ordered_pair'( 
% 2.20/2.61    X, Y ), 'cross_product'( 'universal_class', 'universal_class' ) ) ), 
% 2.20/2.61    member( 'ordered_pair'( X, Y ), 'successor_relation' ) ] )
% 2.20/2.61  , clause( 16961, [ ~( inductive( X ) ), member( 'null_class', X ) ] )
% 2.20/2.61  , clause( 16962, [ ~( inductive( X ) ), subclass( image( 
% 2.20/2.61    'successor_relation', X ), X ) ] )
% 2.20/2.61  , clause( 16963, [ ~( member( 'null_class', X ) ), ~( subclass( image( 
% 2.20/2.61    'successor_relation', X ), X ) ), inductive( X ) ] )
% 2.20/2.61  , clause( 16964, [ inductive( omega ) ] )
% 2.20/2.61  , clause( 16965, [ ~( inductive( X ) ), subclass( omega, X ) ] )
% 2.20/2.61  , clause( 16966, [ member( omega, 'universal_class' ) ] )
% 2.20/2.61  , clause( 16967, [ =( 'domain_of'( restrict( 'element_relation', 
% 2.20/2.61    'universal_class', X ) ), 'sum_class'( X ) ) ] )
% 2.20/2.61  , clause( 16968, [ ~( member( X, 'universal_class' ) ), member( 'sum_class'( 
% 2.20/2.61    X ), 'universal_class' ) ] )
% 2.20/2.61  , clause( 16969, [ =( complement( image( 'element_relation', complement( X
% 2.20/2.61     ) ) ), 'power_class'( X ) ) ] )
% 2.20/2.61  , clause( 16970, [ ~( member( X, 'universal_class' ) ), member( 
% 2.20/2.61    'power_class'( X ), 'universal_class' ) ] )
% 2.20/2.61  , clause( 16971, [ subclass( compose( X, Y ), 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16972, [ ~( member( 'ordered_pair'( X, Y ), compose( Z, T ) ) ), 
% 2.20/2.61    member( Y, image( Z, image( T, singleton( X ) ) ) ) ] )
% 2.20/2.61  , clause( 16973, [ ~( member( X, image( Y, image( Z, singleton( T ) ) ) ) )
% 2.20/2.61    , ~( member( 'ordered_pair'( T, X ), 'cross_product'( 'universal_class', 
% 2.20/2.61    'universal_class' ) ) ), member( 'ordered_pair'( T, X ), compose( Y, Z )
% 2.20/2.61     ) ] )
% 2.20/2.61  , clause( 16974, [ ~( 'single_valued_class'( X ) ), subclass( compose( X, 
% 2.20/2.61    inverse( X ) ), 'identity_relation' ) ] )
% 2.20/2.61  , clause( 16975, [ ~( subclass( compose( X, inverse( X ) ), 
% 2.20/2.61    'identity_relation' ) ), 'single_valued_class'( X ) ] )
% 2.20/2.61  , clause( 16976, [ ~( function( X ) ), subclass( X, 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ] )
% 2.20/2.61  , clause( 16977, [ ~( function( X ) ), subclass( compose( X, inverse( X ) )
% 2.20/2.61    , 'identity_relation' ) ] )
% 2.20/2.61  , clause( 16978, [ ~( subclass( X, 'cross_product'( 'universal_class', 
% 2.20/2.61    'universal_class' ) ) ), ~( subclass( compose( X, inverse( X ) ), 
% 2.20/2.61    'identity_relation' ) ), function( X ) ] )
% 2.20/2.61  , clause( 16979, [ ~( function( X ) ), ~( member( Y, 'universal_class' ) )
% 2.20/2.61    , member( image( X, Y ), 'universal_class' ) ] )
% 2.20/2.61  , clause( 16980, [ =( X, 'null_class' ), member( regular( X ), X ) ] )
% 2.20/2.61  , clause( 16981, [ =( X, 'null_class' ), =( intersection( X, regular( X ) )
% 2.20/2.61    , 'null_class' ) ] )
% 2.20/2.61  , clause( 16982, [ =( 'sum_class'( image( X, singleton( Y ) ) ), apply( X, 
% 2.20/2.61    Y ) ) ] )
% 2.20/2.61  , clause( 16983, [ function( choice ) ] )
% 2.20/2.61  , clause( 16984, [ ~( member( X, 'universal_class' ) ), =( X, 'null_class'
% 2.20/2.61     ), member( apply( choice, X ), X ) ] )
% 2.20/2.61  , clause( 16985, [ ~( 'one_to_one'( X ) ), function( X ) ] )
% 2.20/2.61  , clause( 16986, [ ~( 'one_to_one'( X ) ), function( inverse( X ) ) ] )
% 2.20/2.61  , clause( 16987, [ ~( function( inverse( X ) ) ), ~( function( X ) ), 
% 2.20/2.61    'one_to_one'( X ) ] )
% 2.20/2.61  , clause( 16988, [ =( intersection( 'cross_product'( 'universal_class', 
% 2.20/2.61    'universal_class' ), intersection( 'cross_product'( 'universal_class', 
% 2.20/2.61    'universal_class' ), complement( compose( complement( 'element_relation'
% 2.20/2.61     ), inverse( 'element_relation' ) ) ) ) ), 'subset_relation' ) ] )
% 2.20/2.61  , clause( 16989, [ =( intersection( inverse( 'subset_relation' ), 
% 2.20/2.61    'subset_relation' ), 'identity_relation' ) ] )
% 2.20/2.61  , clause( 16990, [ =( complement( 'domain_of'( intersection( X, 
% 2.20/2.61    'identity_relation' ) ) ), diagonalise( X ) ) ] )
% 2.20/2.61  , clause( 16991, [ =( intersection( 'domain_of'( X ), diagonalise( compose( 
% 2.20/2.61    inverse( 'element_relation' ), X ) ) ), cantor( X ) ) ] )
% 2.20/2.61  , clause( 16992, [ ~( operation( X ) ), function( X ) ] )
% 2.20/2.61  , clause( 16993, [ ~( operation( X ) ), =( 'cross_product'( 'domain_of'( 
% 2.20/2.61    'domain_of'( X ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) )
% 2.20/2.61     ] )
% 2.20/2.61  , clause( 16994, [ ~( operation( X ) ), subclass( 'range_of'( X ), 
% 2.20/2.61    'domain_of'( 'domain_of'( X ) ) ) ] )
% 2.20/2.61  , clause( 16995, [ ~( function( X ) ), ~( =( 'cross_product'( 'domain_of'( 
% 2.20/2.61    'domain_of'( X ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) )
% 2.20/2.61     ), ~( subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( X ) ) ) ), 
% 2.20/2.61    operation( X ) ] )
% 2.20/2.61  , clause( 16996, [ ~( compatible( X, Y, Z ) ), function( X ) ] )
% 2.20/2.61  , clause( 16997, [ ~( compatible( X, Y, Z ) ), =( 'domain_of'( 'domain_of'( 
% 2.20/2.61    Y ) ), 'domain_of'( X ) ) ] )
% 2.20/2.61  , clause( 16998, [ ~( compatible( X, Y, Z ) ), subclass( 'range_of'( X ), 
% 2.20/2.61    'domain_of'( 'domain_of'( Z ) ) ) ] )
% 2.20/2.61  , clause( 16999, [ ~( function( X ) ), ~( =( 'domain_of'( 'domain_of'( Y )
% 2.20/2.61     ), 'domain_of'( X ) ) ), ~( subclass( 'range_of'( X ), 'domain_of'( 
% 2.20/2.61    'domain_of'( Z ) ) ) ), compatible( X, Y, Z ) ] )
% 2.20/2.61  , clause( 17000, [ ~( homomorphism( X, Y, Z ) ), operation( Y ) ] )
% 2.20/2.61  , clause( 17001, [ ~( homomorphism( X, Y, Z ) ), operation( Z ) ] )
% 2.20/2.61  , clause( 17002, [ ~( homomorphism( X, Y, Z ) ), compatible( X, Y, Z ) ] )
% 2.20/2.61  , clause( 17003, [ ~( homomorphism( X, Y, Z ) ), ~( member( 'ordered_pair'( 
% 2.20/2.61    T, U ), 'domain_of'( Y ) ) ), =( apply( Z, 'ordered_pair'( apply( X, T )
% 2.20/2.61    , apply( X, U ) ) ), apply( X, apply( Y, 'ordered_pair'( T, U ) ) ) ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17004, [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( 
% 2.20/2.61    Z, X, Y ) ), member( 'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 
% 2.20/2.61    'not_homomorphism2'( Z, X, Y ) ), 'domain_of'( X ) ), homomorphism( Z, X
% 2.20/2.61    , Y ) ] )
% 2.20/2.61  , clause( 17005, [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( 
% 2.20/2.61    Z, X, Y ) ), ~( =( apply( Y, 'ordered_pair'( apply( Z, 
% 2.20/2.61    'not_homomorphism1'( Z, X, Y ) ), apply( Z, 'not_homomorphism2'( Z, X, Y
% 2.20/2.61     ) ) ) ), apply( Z, apply( X, 'ordered_pair'( 'not_homomorphism1'( Z, X, 
% 2.20/2.61    Y ), 'not_homomorphism2'( Z, X, Y ) ) ) ) ) ), homomorphism( Z, X, Y ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17006, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( X, 'unordered_pair'( X, Y ) ) ] )
% 2.20/2.61  , clause( 17007, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( Y, 'unordered_pair'( X, Y ) ) ] )
% 2.20/2.61  , clause( 17008, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( X, 'universal_class' ) ] )
% 2.20/2.61  , clause( 17009, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), member( Y, 'universal_class' ) ] )
% 2.20/2.61  , clause( 17010, [ subclass( X, X ) ] )
% 2.20/2.61  , clause( 17011, [ ~( subclass( X, Y ) ), ~( subclass( Y, Z ) ), subclass( 
% 2.20/2.61    X, Z ) ] )
% 2.20/2.61  , clause( 17012, [ =( X, Y ), member( 'not_subclass_element'( X, Y ), X ), 
% 2.20/2.61    member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.20/2.61  , clause( 17013, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( X, 
% 2.20/2.61    Y ), member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.20/2.61  , clause( 17014, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( Y, 
% 2.20/2.61    X ), member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.20/2.61  , clause( 17015, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), ~( 
% 2.20/2.61    member( 'not_subclass_element'( Y, X ), X ) ), =( X, Y ) ] )
% 2.20/2.61  , clause( 17016, [ ~( member( X, intersection( complement( Y ), Y ) ) ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17017, [ ~( member( X, 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17018, [ subclass( 'null_class', X ) ] )
% 2.20/2.61  , clause( 17019, [ ~( subclass( X, 'null_class' ) ), =( X, 'null_class' ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17020, [ =( X, 'null_class' ), member( 'not_subclass_element'( X
% 2.20/2.61    , 'null_class' ), X ) ] )
% 2.20/2.61  , clause( 17021, [ member( 'null_class', 'universal_class' ) ] )
% 2.20/2.61  , clause( 17022, [ =( 'unordered_pair'( X, Y ), 'unordered_pair'( Y, X ) )
% 2.20/2.61     ] )
% 2.20/2.61  , clause( 17023, [ subclass( singleton( X ), 'unordered_pair'( X, Y ) ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17024, [ subclass( singleton( X ), 'unordered_pair'( Y, X ) ) ]
% 2.20/2.61     )
% 2.20/2.61  , clause( 17025, [ member( X, 'universal_class' ), =( 'unordered_pair'( Y, 
% 2.20/2.61    X ), singleton( Y ) ) ] )
% 2.20/2.61  , clause( 17026, [ member( X, 'universal_class' ), =( 'unordered_pair'( X, 
% 2.20/2.61    Y ), singleton( Y ) ) ] )
% 2.20/2.61  , clause( 17027, [ =( 'unordered_pair'( X, Y ), 'null_class' ), member( X, 
% 2.20/2.61    'universal_class' ), member( Y, 'universal_class' ) ] )
% 2.20/2.61  , clause( 17028, [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( X, Z )
% 2.20/2.61     ) ), ~( member( 'ordered_pair'( Y, Z ), 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ), =( Y, Z ) ] )
% 2.20/2.61  , clause( 17029, [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( Z, Y )
% 2.20/2.61     ) ), ~( member( 'ordered_pair'( X, Z ), 'cross_product'( 
% 2.20/2.61    'universal_class', 'universal_class' ) ) ), =( X, Z ) ] )
% 2.20/2.61  , clause( 17030, [ ~( member( X, 'universal_class' ) ), ~( =( 
% 2.20/2.61    'unordered_pair'( X, Y ), 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17031, [ ~( member( X, 'universal_class' ) ), ~( =( 
% 2.20/2.61    'unordered_pair'( Y, X ), 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17032, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.20/2.61     ) ) ), ~( =( 'unordered_pair'( X, Y ), 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17033, [ ~( member( X, Y ) ), ~( member( Z, Y ) ), subclass( 
% 2.20/2.61    'unordered_pair'( X, Z ), Y ) ] )
% 2.20/2.61  , clause( 17034, [ member( singleton( X ), 'universal_class' ) ] )
% 2.20/2.61  , clause( 17035, [ member( singleton( X ), 'unordered_pair'( Y, singleton( 
% 2.20/2.61    X ) ) ) ] )
% 2.20/2.61  , clause( 17036, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    singleton( X ) ) ] )
% 2.20/2.61  , clause( 17037, [ ~( member( X, 'universal_class' ) ), ~( =( singleton( X
% 2.20/2.61     ), 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17038, [ member( 'null_class', singleton( 'null_class' ) ) ] )
% 2.20/2.61  , clause( 17039, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.20/2.61  , clause( 17040, [ member( X, 'universal_class' ), =( singleton( X ), 
% 2.20/2.61    'null_class' ) ] )
% 2.20/2.61  , clause( 17041, [ =( singleton( x ), singleton( y ) ) ] )
% 2.20/2.61  , clause( 17042, [ member( x, 'universal_class' ) ] )
% 2.20/2.61  , clause( 17043, [ ~( =( x, y ) ) ] )
% 2.20/2.61  ] ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  , clause( 16919, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.20/2.61     ), ==>( 1, 1 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 5, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ] )
% 2.20/2.61  , clause( 16921, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y )
% 2.20/2.61     ] )
% 2.20/2.61  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.20/2.61     ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 8, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    'unordered_pair'( Y, X ) ) ] )
% 2.20/2.61  , clause( 16924, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.20/2.61    'unordered_pair'( Y, X ) ) ] )
% 2.20/2.61  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.20/2.61     ), ==>( 1, 1 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 10, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.20/2.61  , clause( 16926, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.20/2.61  , substitution( 0, [ :=( X, X )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 122, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.20/2.61  , clause( 17039, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.20/2.61  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.20/2.61     ), ==>( 1, 1 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  eqswap(
% 2.20/2.61  clause( 17214, [ =( singleton( y ), singleton( x ) ) ] )
% 2.20/2.61  , clause( 17041, [ =( singleton( x ), singleton( y ) ) ] )
% 2.20/2.61  , 0, substitution( 0, [] )).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 124, [ =( singleton( y ), singleton( x ) ) ] )
% 2.20/2.61  , clause( 17214, [ =( singleton( y ), singleton( x ) ) ] )
% 2.20/2.61  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 125, [ member( x, 'universal_class' ) ] )
% 2.20/2.61  , clause( 17042, [ member( x, 'universal_class' ) ] )
% 2.20/2.61  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  eqswap(
% 2.20/2.61  clause( 17367, [ ~( =( y, x ) ) ] )
% 2.20/2.61  , clause( 17043, [ ~( =( x, y ) ) ] )
% 2.20/2.61  , 0, substitution( 0, [] )).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  subsumption(
% 2.20/2.61  clause( 126, [ ~( =( y, x ) ) ] )
% 2.20/2.61  , clause( 17367, [ ~( =( y, x ) ) ] )
% 2.20/2.61  , substitution( 0, [] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  eqswap(
% 2.20/2.61  clause( 17368, [ ~( =( Y, X ) ), subclass( X, Y ) ] )
% 2.20/2.61  , clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y )] )).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  eqswap(
% 2.20/2.61  clause( 17369, [ ~( =( Y, X ) ), subclass( X, Y ) ] )
% 2.20/2.61  , clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.20/2.61  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y )] )).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  resolution(
% 2.20/2.61  clause( 17370, [ ~( subclass( Y, X ) ), =( X, Y ), ~( =( Y, X ) ) ] )
% 2.20/2.61  , clause( 5, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ] )
% 2.20/2.61  , 0, clause( 17368, [ ~( =( Y, X ) ), subclass( X, Y ) ] )
% 2.20/2.61  , 1, substitution( 0, [ :=( X, X ), :=( Y, Y )] ), substitution( 1, [ :=( X
% 2.20/2.61    , X ), :=( Y, Y )] )).
% 2.20/2.61  
% 2.20/2.61  
% 2.20/2.61  resolution(
% 2.20/2.61  clause( 17372, [ =( Y, X ), ~( =( X, Y ) ), ~Cputime limit exceeded (core dumped)
%------------------------------------------------------------------------------