TSTP Solution File: SET085-7 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : SET085-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n015.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 22:46:48 EDT 2022

% Result   : Unsatisfiable 2.75s 3.19s
% Output   : Refutation 2.75s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.11/0.11  % Problem  : SET085-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% 0.11/0.12  % Command  : bliksem %s
% 0.12/0.33  % Computer : n015.cluster.edu
% 0.12/0.33  % Model    : x86_64 x86_64
% 0.12/0.33  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.33  % Memory   : 8042.1875MB
% 0.12/0.33  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.33  % CPULimit : 300
% 0.12/0.33  % DateTime : Sun Jul 10 06:41:23 EDT 2022
% 0.12/0.33  % CPUTime  : 
% 0.72/1.11  *** allocated 10000 integers for termspace/termends
% 0.72/1.11  *** allocated 10000 integers for clauses
% 0.72/1.11  *** allocated 10000 integers for justifications
% 0.72/1.11  Bliksem 1.12
% 0.72/1.11  
% 0.72/1.11  
% 0.72/1.11  Automatic Strategy Selection
% 0.72/1.11  
% 0.72/1.11  Clauses:
% 0.72/1.11  [
% 0.72/1.11     [ ~( subclass( X, Y ) ), ~( member( Z, X ) ), member( Z, Y ) ],
% 0.72/1.11     [ member( 'not_subclass_element'( X, Y ), X ), subclass( X, Y ) ],
% 0.72/1.11     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), subclass( X, Y ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ subclass( X, 'universal_class' ) ],
% 0.72/1.11     [ ~( =( X, Y ) ), subclass( X, Y ) ],
% 0.72/1.11     [ ~( =( X, Y ) ), subclass( Y, X ) ],
% 0.72/1.11     [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ],
% 0.72/1.11     [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), =( X, Z ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), member( X, 'unordered_pair'( X, Y
% 0.72/1.11     ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), member( X, 'unordered_pair'( Y, X
% 0.72/1.11     ) ) ],
% 0.72/1.11     [ member( 'unordered_pair'( X, Y ), 'universal_class' ) ],
% 0.72/1.11     [ =( 'unordered_pair'( X, X ), singleton( X ) ) ],
% 0.72/1.11     [ =( 'unordered_pair'( singleton( X ), 'unordered_pair'( X, singleton( Y
% 0.72/1.11     ) ) ), 'ordered_pair'( X, Y ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    X, Z ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    Y, T ) ],
% 0.72/1.11     [ ~( member( X, Y ) ), ~( member( Z, T ) ), member( 'ordered_pair'( X, Z
% 0.72/1.11     ), 'cross_product'( Y, T ) ) ],
% 0.72/1.11     [ ~( member( X, 'cross_product'( Y, Z ) ) ), =( 'ordered_pair'( first( X
% 0.72/1.11     ), second( X ) ), X ) ],
% 0.72/1.11     [ subclass( 'element_relation', 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'element_relation' ) ), member( X, 
% 0.72/1.11    Y ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( 'universal_class'
% 0.72/1.11    , 'universal_class' ) ) ), ~( member( X, Y ) ), member( 'ordered_pair'( X
% 0.72/1.11    , Y ), 'element_relation' ) ],
% 0.72/1.11     [ ~( member( X, intersection( Y, Z ) ) ), member( X, Y ) ],
% 0.72/1.11     [ ~( member( X, intersection( Y, Z ) ) ), member( X, Z ) ],
% 0.72/1.11     [ ~( member( X, Y ) ), ~( member( X, Z ) ), member( X, intersection( Y, 
% 0.72/1.11    Z ) ) ],
% 0.72/1.11     [ ~( member( X, complement( Y ) ) ), ~( member( X, Y ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), member( X, complement( Y ) ), 
% 0.72/1.11    member( X, Y ) ],
% 0.72/1.11     [ =( complement( intersection( complement( X ), complement( Y ) ) ), 
% 0.72/1.11    union( X, Y ) ) ],
% 0.72/1.11     [ =( intersection( complement( intersection( X, Y ) ), complement( 
% 0.72/1.11    intersection( complement( X ), complement( Y ) ) ) ), 
% 0.72/1.11    'symmetric_difference'( X, Y ) ) ],
% 0.72/1.11     [ =( intersection( X, 'cross_product'( Y, Z ) ), restrict( X, Y, Z ) ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ =( intersection( 'cross_product'( X, Y ), Z ), restrict( Z, X, Y ) ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ ~( =( restrict( X, singleton( Y ), 'universal_class' ), 'null_class' )
% 0.72/1.11     ), ~( member( Y, 'domain_of'( X ) ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), =( restrict( Y, singleton( X ), 
% 0.72/1.11    'universal_class' ), 'null_class' ), member( X, 'domain_of'( Y ) ) ],
% 0.72/1.11     [ subclass( rotate( X ), 'cross_product'( 'cross_product'( 
% 0.72/1.11    'universal_class', 'universal_class' ), 'universal_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), rotate( T ) )
% 0.72/1.11     ), member( 'ordered_pair'( 'ordered_pair'( Y, Z ), X ), T ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), T ) ), ~( 
% 0.72/1.11    member( 'ordered_pair'( 'ordered_pair'( Z, X ), Y ), 'cross_product'( 
% 0.72/1.11    'cross_product'( 'universal_class', 'universal_class' ), 
% 0.72/1.11    'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Z, X ), 
% 0.72/1.11    Y ), rotate( T ) ) ],
% 0.72/1.11     [ subclass( flip( X ), 'cross_product'( 'cross_product'( 
% 0.72/1.11    'universal_class', 'universal_class' ), 'universal_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), flip( T ) ) )
% 0.72/1.11    , member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), T ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), T ) ), ~( 
% 0.72/1.11    member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), 'cross_product'( 
% 0.72/1.11    'cross_product'( 'universal_class', 'universal_class' ), 
% 0.72/1.11    'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X ), 
% 0.72/1.11    Z ), flip( T ) ) ],
% 0.72/1.11     [ =( 'domain_of'( flip( 'cross_product'( X, 'universal_class' ) ) ), 
% 0.72/1.11    inverse( X ) ) ],
% 0.72/1.11     [ =( 'domain_of'( inverse( X ) ), 'range_of'( X ) ) ],
% 0.72/1.11     [ =( first( 'not_subclass_element'( restrict( X, Y, singleton( Z ) ), 
% 0.72/1.11    'null_class' ) ), domain( X, Y, Z ) ) ],
% 0.72/1.11     [ =( second( 'not_subclass_element'( restrict( X, singleton( Y ), Z ), 
% 0.72/1.11    'null_class' ) ), range( X, Y, Z ) ) ],
% 0.72/1.11     [ =( 'range_of'( restrict( X, Y, 'universal_class' ) ), image( X, Y ) )
% 0.72/1.11     ],
% 0.72/1.11     [ =( union( X, singleton( X ) ), successor( X ) ) ],
% 0.72/1.11     [ subclass( 'successor_relation', 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'successor_relation' ) ), =( 
% 0.72/1.11    successor( X ), Y ) ],
% 0.72/1.11     [ ~( =( successor( X ), Y ) ), ~( member( 'ordered_pair'( X, Y ), 
% 0.72/1.11    'cross_product'( 'universal_class', 'universal_class' ) ) ), member( 
% 0.72/1.11    'ordered_pair'( X, Y ), 'successor_relation' ) ],
% 0.72/1.11     [ ~( inductive( X ) ), member( 'null_class', X ) ],
% 0.72/1.11     [ ~( inductive( X ) ), subclass( image( 'successor_relation', X ), X ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ ~( member( 'null_class', X ) ), ~( subclass( image( 
% 0.72/1.11    'successor_relation', X ), X ) ), inductive( X ) ],
% 0.72/1.11     [ inductive( omega ) ],
% 0.72/1.11     [ ~( inductive( X ) ), subclass( omega, X ) ],
% 0.72/1.11     [ member( omega, 'universal_class' ) ],
% 0.72/1.11     [ =( 'domain_of'( restrict( 'element_relation', 'universal_class', X ) )
% 0.72/1.11    , 'sum_class'( X ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), member( 'sum_class'( X ), 
% 0.72/1.11    'universal_class' ) ],
% 0.72/1.11     [ =( complement( image( 'element_relation', complement( X ) ) ), 
% 0.72/1.11    'power_class'( X ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), member( 'power_class'( X ), 
% 0.72/1.11    'universal_class' ) ],
% 0.72/1.11     [ subclass( compose( X, Y ), 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), compose( Z, T ) ) ), member( Y, 
% 0.72/1.11    image( Z, image( T, singleton( X ) ) ) ) ],
% 0.72/1.11     [ ~( member( X, image( Y, image( Z, singleton( T ) ) ) ) ), ~( member( 
% 0.72/1.11    'ordered_pair'( T, X ), 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ), member( 'ordered_pair'( T, X ), compose( Y, Z )
% 0.72/1.11     ) ],
% 0.72/1.11     [ ~( 'single_valued_class'( X ) ), subclass( compose( X, inverse( X ) )
% 0.72/1.11    , 'identity_relation' ) ],
% 0.72/1.11     [ ~( subclass( compose( X, inverse( X ) ), 'identity_relation' ) ), 
% 0.72/1.11    'single_valued_class'( X ) ],
% 0.72/1.11     [ ~( function( X ) ), subclass( X, 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ],
% 0.72/1.11     [ ~( function( X ) ), subclass( compose( X, inverse( X ) ), 
% 0.72/1.11    'identity_relation' ) ],
% 0.72/1.11     [ ~( subclass( X, 'cross_product'( 'universal_class', 'universal_class'
% 0.72/1.11     ) ) ), ~( subclass( compose( X, inverse( X ) ), 'identity_relation' ) )
% 0.72/1.11    , function( X ) ],
% 0.72/1.11     [ ~( function( X ) ), ~( member( Y, 'universal_class' ) ), member( image( 
% 0.72/1.11    X, Y ), 'universal_class' ) ],
% 0.72/1.11     [ =( X, 'null_class' ), member( regular( X ), X ) ],
% 0.72/1.11     [ =( X, 'null_class' ), =( intersection( X, regular( X ) ), 'null_class'
% 0.72/1.11     ) ],
% 0.72/1.11     [ =( 'sum_class'( image( X, singleton( Y ) ) ), apply( X, Y ) ) ],
% 0.72/1.11     [ function( choice ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), =( X, 'null_class' ), member( 
% 0.72/1.11    apply( choice, X ), X ) ],
% 0.72/1.11     [ ~( 'one_to_one'( X ) ), function( X ) ],
% 0.72/1.11     [ ~( 'one_to_one'( X ) ), function( inverse( X ) ) ],
% 0.72/1.11     [ ~( function( inverse( X ) ) ), ~( function( X ) ), 'one_to_one'( X ) ]
% 0.72/1.11    ,
% 0.72/1.11     [ =( intersection( 'cross_product'( 'universal_class', 'universal_class'
% 0.72/1.11     ), intersection( 'cross_product'( 'universal_class', 'universal_class' )
% 0.72/1.11    , complement( compose( complement( 'element_relation' ), inverse( 
% 0.72/1.11    'element_relation' ) ) ) ) ), 'subset_relation' ) ],
% 0.72/1.11     [ =( intersection( inverse( 'subset_relation' ), 'subset_relation' ), 
% 0.72/1.11    'identity_relation' ) ],
% 0.72/1.11     [ =( complement( 'domain_of'( intersection( X, 'identity_relation' ) ) )
% 0.72/1.11    , diagonalise( X ) ) ],
% 0.72/1.11     [ =( intersection( 'domain_of'( X ), diagonalise( compose( inverse( 
% 0.72/1.11    'element_relation' ), X ) ) ), cantor( X ) ) ],
% 0.72/1.11     [ ~( operation( X ) ), function( X ) ],
% 0.72/1.11     [ ~( operation( X ) ), =( 'cross_product'( 'domain_of'( 'domain_of'( X )
% 0.72/1.11     ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) ) ],
% 0.72/1.11     [ ~( operation( X ) ), subclass( 'range_of'( X ), 'domain_of'( 
% 0.72/1.11    'domain_of'( X ) ) ) ],
% 0.72/1.11     [ ~( function( X ) ), ~( =( 'cross_product'( 'domain_of'( 'domain_of'( X
% 0.72/1.11     ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) ) ), ~( 
% 0.72/1.11    subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( X ) ) ) ), operation( 
% 0.72/1.11    X ) ],
% 0.72/1.11     [ ~( compatible( X, Y, Z ) ), function( X ) ],
% 0.72/1.11     [ ~( compatible( X, Y, Z ) ), =( 'domain_of'( 'domain_of'( Y ) ), 
% 0.72/1.11    'domain_of'( X ) ) ],
% 0.72/1.11     [ ~( compatible( X, Y, Z ) ), subclass( 'range_of'( X ), 'domain_of'( 
% 0.72/1.11    'domain_of'( Z ) ) ) ],
% 0.72/1.11     [ ~( function( X ) ), ~( =( 'domain_of'( 'domain_of'( Y ) ), 'domain_of'( 
% 0.72/1.11    X ) ) ), ~( subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( Z ) ) )
% 0.72/1.11     ), compatible( X, Y, Z ) ],
% 0.72/1.11     [ ~( homomorphism( X, Y, Z ) ), operation( Y ) ],
% 0.72/1.11     [ ~( homomorphism( X, Y, Z ) ), operation( Z ) ],
% 0.72/1.11     [ ~( homomorphism( X, Y, Z ) ), compatible( X, Y, Z ) ],
% 0.72/1.11     [ ~( homomorphism( X, Y, Z ) ), ~( member( 'ordered_pair'( T, U ), 
% 0.72/1.11    'domain_of'( Y ) ) ), =( apply( Z, 'ordered_pair'( apply( X, T ), apply( 
% 0.72/1.11    X, U ) ) ), apply( X, apply( Y, 'ordered_pair'( T, U ) ) ) ) ],
% 0.72/1.11     [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( Z, X, Y ) ), 
% 0.72/1.11    member( 'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 
% 0.72/1.11    'not_homomorphism2'( Z, X, Y ) ), 'domain_of'( X ) ), homomorphism( Z, X
% 0.72/1.11    , Y ) ],
% 0.72/1.11     [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( Z, X, Y ) ), 
% 0.72/1.11    ~( =( apply( Y, 'ordered_pair'( apply( Z, 'not_homomorphism1'( Z, X, Y )
% 0.72/1.11     ), apply( Z, 'not_homomorphism2'( Z, X, Y ) ) ) ), apply( Z, apply( X, 
% 0.72/1.11    'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 'not_homomorphism2'( Z, X
% 0.72/1.11    , Y ) ) ) ) ) ), homomorphism( Z, X, Y ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    X, 'unordered_pair'( X, Y ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    Y, 'unordered_pair'( X, Y ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    X, 'universal_class' ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), member( 
% 0.72/1.11    Y, 'universal_class' ) ],
% 0.72/1.11     [ subclass( X, X ) ],
% 0.72/1.11     [ ~( subclass( X, Y ) ), ~( subclass( Y, Z ) ), subclass( X, Z ) ],
% 0.72/1.11     [ =( X, Y ), member( 'not_subclass_element'( X, Y ), X ), member( 
% 0.72/1.11    'not_subclass_element'( Y, X ), Y ) ],
% 0.72/1.11     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( X, Y ), member( 
% 0.72/1.11    'not_subclass_element'( Y, X ), Y ) ],
% 0.72/1.11     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( Y, X ), member( 
% 0.72/1.11    'not_subclass_element'( Y, X ), Y ) ],
% 0.72/1.11     [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), ~( member( 
% 0.72/1.11    'not_subclass_element'( Y, X ), X ) ), =( X, Y ) ],
% 0.72/1.11     [ ~( member( X, intersection( complement( Y ), Y ) ) ) ],
% 0.72/1.11     [ ~( member( X, 'null_class' ) ) ],
% 0.72/1.11     [ subclass( 'null_class', X ) ],
% 0.72/1.11     [ ~( subclass( X, 'null_class' ) ), =( X, 'null_class' ) ],
% 0.72/1.11     [ =( X, 'null_class' ), member( 'not_subclass_element'( X, 'null_class'
% 0.72/1.11     ), X ) ],
% 0.72/1.11     [ member( 'null_class', 'universal_class' ) ],
% 0.72/1.11     [ =( 'unordered_pair'( X, Y ), 'unordered_pair'( Y, X ) ) ],
% 0.72/1.11     [ subclass( singleton( X ), 'unordered_pair'( X, Y ) ) ],
% 0.72/1.11     [ subclass( singleton( X ), 'unordered_pair'( Y, X ) ) ],
% 0.72/1.11     [ member( X, 'universal_class' ), =( 'unordered_pair'( Y, X ), singleton( 
% 0.72/1.11    Y ) ) ],
% 0.72/1.11     [ member( X, 'universal_class' ), =( 'unordered_pair'( X, Y ), singleton( 
% 0.72/1.11    Y ) ) ],
% 0.72/1.11     [ =( 'unordered_pair'( X, Y ), 'null_class' ), member( X, 
% 0.72/1.11    'universal_class' ), member( Y, 'universal_class' ) ],
% 0.72/1.11     [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( X, Z ) ) ), ~( 
% 0.72/1.11    member( 'ordered_pair'( Y, Z ), 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ), =( Y, Z ) ],
% 0.72/1.11     [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( Z, Y ) ) ), ~( 
% 0.72/1.11    member( 'ordered_pair'( X, Z ), 'cross_product'( 'universal_class', 
% 0.72/1.11    'universal_class' ) ) ), =( X, Z ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), ~( =( 'unordered_pair'( X, Y ), 
% 0.72/1.11    'null_class' ) ) ],
% 0.72/1.11     [ ~( member( X, 'universal_class' ) ), ~( =( 'unordered_pair'( Y, X ), 
% 0.72/1.11    'null_class' ) ) ],
% 0.72/1.11     [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T ) ) ), ~( =( 
% 0.72/1.11    'unordered_pair'( X, Y ), 'null_class' ) ) ],
% 2.75/3.19     [ ~( member( X, Y ) ), ~( member( Z, Y ) ), subclass( 'unordered_pair'( 
% 2.75/3.19    X, Z ), Y ) ],
% 2.75/3.19     [ member( singleton( X ), 'universal_class' ) ],
% 2.75/3.19     [ member( singleton( X ), 'unordered_pair'( Y, singleton( X ) ) ) ],
% 2.75/3.19     [ ~( member( X, 'universal_class' ) ), member( X, singleton( X ) ) ]
% 2.75/3.19    ,
% 2.75/3.19     [ ~( member( X, 'universal_class' ) ), ~( =( singleton( X ), 
% 2.75/3.19    'null_class' ) ) ],
% 2.75/3.19     [ member( 'null_class', singleton( 'null_class' ) ) ],
% 2.75/3.19     [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ],
% 2.75/3.19     [ member( X, 'universal_class' ), =( singleton( X ), 'null_class' ) ]
% 2.75/3.19    ,
% 2.75/3.19     [ ~( =( singleton( X ), singleton( Y ) ) ), ~( member( X, 
% 2.75/3.19    'universal_class' ) ), =( X, Y ) ],
% 2.75/3.19     [ ~( =( singleton( X ), singleton( Y ) ) ), ~( member( Y, 
% 2.75/3.19    'universal_class' ) ), =( X, Y ) ],
% 2.75/3.19     [ =( 'unordered_pair'( y, z ), singleton( x ) ) ],
% 2.75/3.19     [ member( x, 'universal_class' ) ],
% 2.75/3.19     [ ~( =( x, y ) ) ],
% 2.75/3.19     [ ~( =( x, z ) ) ]
% 2.75/3.19  ] .
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  percentage equality = 0.254826, percentage horn = 0.878788
% 2.75/3.19  This is a problem with some equality
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Options Used:
% 2.75/3.19  
% 2.75/3.19  useres =            1
% 2.75/3.19  useparamod =        1
% 2.75/3.19  useeqrefl =         1
% 2.75/3.19  useeqfact =         1
% 2.75/3.19  usefactor =         1
% 2.75/3.19  usesimpsplitting =  0
% 2.75/3.19  usesimpdemod =      5
% 2.75/3.19  usesimpres =        3
% 2.75/3.19  
% 2.75/3.19  resimpinuse      =  1000
% 2.75/3.19  resimpclauses =     20000
% 2.75/3.19  substype =          eqrewr
% 2.75/3.19  backwardsubs =      1
% 2.75/3.19  selectoldest =      5
% 2.75/3.19  
% 2.75/3.19  litorderings [0] =  split
% 2.75/3.19  litorderings [1] =  extend the termordering, first sorting on arguments
% 2.75/3.19  
% 2.75/3.19  termordering =      kbo
% 2.75/3.19  
% 2.75/3.19  litapriori =        0
% 2.75/3.19  termapriori =       1
% 2.75/3.19  litaposteriori =    0
% 2.75/3.19  termaposteriori =   0
% 2.75/3.19  demodaposteriori =  0
% 2.75/3.19  ordereqreflfact =   0
% 2.75/3.19  
% 2.75/3.19  litselect =         negord
% 2.75/3.19  
% 2.75/3.19  maxweight =         15
% 2.75/3.19  maxdepth =          30000
% 2.75/3.19  maxlength =         115
% 2.75/3.19  maxnrvars =         195
% 2.75/3.19  excuselevel =       1
% 2.75/3.19  increasemaxweight = 1
% 2.75/3.19  
% 2.75/3.19  maxselected =       10000000
% 2.75/3.19  maxnrclauses =      10000000
% 2.75/3.19  
% 2.75/3.19  showgenerated =    0
% 2.75/3.19  showkept =         0
% 2.75/3.19  showselected =     0
% 2.75/3.19  showdeleted =      0
% 2.75/3.19  showresimp =       1
% 2.75/3.19  showstatus =       2000
% 2.75/3.19  
% 2.75/3.19  prologoutput =     1
% 2.75/3.19  nrgoals =          5000000
% 2.75/3.19  totalproof =       1
% 2.75/3.19  
% 2.75/3.19  Symbols occurring in the translation:
% 2.75/3.19  
% 2.75/3.19  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 2.75/3.19  .  [1, 2]      (w:1, o:57, a:1, s:1, b:0), 
% 2.75/3.19  !  [4, 1]      (w:0, o:32, a:1, s:1, b:0), 
% 2.75/3.19  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 2.75/3.19  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 2.75/3.19  subclass  [41, 2]      (w:1, o:82, a:1, s:1, b:0), 
% 2.75/3.19  member  [43, 2]      (w:1, o:83, a:1, s:1, b:0), 
% 2.75/3.19  'not_subclass_element'  [44, 2]      (w:1, o:84, a:1, s:1, b:0), 
% 2.75/3.19  'universal_class'  [45, 0]      (w:1, o:21, a:1, s:1, b:0), 
% 2.75/3.19  'unordered_pair'  [46, 2]      (w:1, o:85, a:1, s:1, b:0), 
% 2.75/3.19  singleton  [47, 1]      (w:1, o:40, a:1, s:1, b:0), 
% 2.75/3.19  'ordered_pair'  [48, 2]      (w:1, o:86, a:1, s:1, b:0), 
% 2.75/3.19  'cross_product'  [50, 2]      (w:1, o:87, a:1, s:1, b:0), 
% 2.75/3.19  first  [52, 1]      (w:1, o:41, a:1, s:1, b:0), 
% 2.75/3.19  second  [53, 1]      (w:1, o:42, a:1, s:1, b:0), 
% 2.75/3.19  'element_relation'  [54, 0]      (w:1, o:25, a:1, s:1, b:0), 
% 2.75/3.19  intersection  [55, 2]      (w:1, o:89, a:1, s:1, b:0), 
% 2.75/3.19  complement  [56, 1]      (w:1, o:43, a:1, s:1, b:0), 
% 2.75/3.19  union  [57, 2]      (w:1, o:90, a:1, s:1, b:0), 
% 2.75/3.19  'symmetric_difference'  [58, 2]      (w:1, o:91, a:1, s:1, b:0), 
% 2.75/3.19  restrict  [60, 3]      (w:1, o:94, a:1, s:1, b:0), 
% 2.75/3.19  'null_class'  [61, 0]      (w:1, o:26, a:1, s:1, b:0), 
% 2.75/3.19  'domain_of'  [62, 1]      (w:1, o:45, a:1, s:1, b:0), 
% 2.75/3.19  rotate  [63, 1]      (w:1, o:37, a:1, s:1, b:0), 
% 2.75/3.19  flip  [65, 1]      (w:1, o:46, a:1, s:1, b:0), 
% 2.75/3.19  inverse  [66, 1]      (w:1, o:47, a:1, s:1, b:0), 
% 2.75/3.19  'range_of'  [67, 1]      (w:1, o:38, a:1, s:1, b:0), 
% 2.75/3.19  domain  [68, 3]      (w:1, o:96, a:1, s:1, b:0), 
% 2.75/3.19  range  [69, 3]      (w:1, o:97, a:1, s:1, b:0), 
% 2.75/3.19  image  [70, 2]      (w:1, o:88, a:1, s:1, b:0), 
% 2.75/3.19  successor  [71, 1]      (w:1, o:48, a:1, s:1, b:0), 
% 2.75/3.19  'successor_relation'  [72, 0]      (w:1, o:6, a:1, s:1, b:0), 
% 2.75/3.19  inductive  [73, 1]      (w:1, o:49, a:1, s:1, b:0), 
% 2.75/3.19  omega  [74, 0]      (w:1, o:9, a:1, s:1, b:0), 
% 2.75/3.19  'sum_class'  [75, 1]      (w:1, o:50, a:1, s:1, b:0), 
% 2.75/3.19  'power_class'  [76, 1]      (w:1, o:53, a:1, s:1, b:0), 
% 2.75/3.19  compose  [78, 2]      (w:1, o:92, a:1, s:1, b:0), 
% 2.75/3.19  'single_valued_class'  [79, 1]      (w:1, o:54, a:1, s:1, b:0), 
% 2.75/3.19  'identity_relation'  [80, 0]      (w:1, o:27, a:1, s:1, b:0), 
% 2.75/3.19  function  [82, 1]      (w:1, o:55, a:1, s:1, b:0), 
% 2.75/3.19  regular  [83, 1]      (w:1, o:39, a:1, s:1, b:0), 
% 2.75/3.19  apply  [84, 2]      (w:1, o:93, a:1, s:1, b:0), 
% 2.75/3.19  choice  [85, 0]      (w:1, o:28, a:1, s:1, b:0), 
% 2.75/3.19  'one_to_one'  [86, 1]      (w:1, o:51, a:1, s:1, b:0), 
% 2.75/3.19  'subset_relation'  [87, 0]      (w:1, o:5, a:1, s:1, b:0), 
% 2.75/3.19  diagonalise  [88, 1]      (w:1, o:56, a:1, s:1, b:0), 
% 2.75/3.19  cantor  [89, 1]      (w:1, o:44, a:1, s:1, b:0), 
% 2.75/3.19  operation  [90, 1]      (w:1, o:52, a:1, s:1, b:0), 
% 2.75/3.19  compatible  [94, 3]      (w:1, o:95, a:1, s:1, b:0), 
% 2.75/3.19  homomorphism  [95, 3]      (w:1, o:98, a:1, s:1, b:0), 
% 2.75/3.19  'not_homomorphism1'  [96, 3]      (w:1, o:99, a:1, s:1, b:0), 
% 2.75/3.19  'not_homomorphism2'  [97, 3]      (w:1, o:100, a:1, s:1, b:0), 
% 2.75/3.19  y  [98, 0]      (w:1, o:30, a:1, s:1, b:0), 
% 2.75/3.19  z  [99, 0]      (w:1, o:31, a:1, s:1, b:0), 
% 2.75/3.19  x  [100, 0]      (w:1, o:29, a:1, s:1, b:0).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Starting Search:
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    3817
% 2.75/3.19  Kept:         2011
% 2.75/3.19  Inuse:        118
% 2.75/3.19  Deleted:      2
% 2.75/3.19  Deletedinuse: 2
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    9524
% 2.75/3.19  Kept:         4220
% 2.75/3.19  Inuse:        201
% 2.75/3.19  Deleted:      8
% 2.75/3.19  Deletedinuse: 8
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    14596
% 2.75/3.19  Kept:         6237
% 2.75/3.19  Inuse:        279
% 2.75/3.19  Deleted:      47
% 2.75/3.19  Deletedinuse: 45
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    20591
% 2.75/3.19  Kept:         8254
% 2.75/3.19  Inuse:        329
% 2.75/3.19  Deleted:      55
% 2.75/3.19  Deletedinuse: 50
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    27139
% 2.75/3.19  Kept:         10293
% 2.75/3.19  Inuse:        391
% 2.75/3.19  Deleted:      68
% 2.75/3.19  Deletedinuse: 53
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    35262
% 2.75/3.19  Kept:         12298
% 2.75/3.19  Inuse:        432
% 2.75/3.19  Deleted:      71
% 2.75/3.19  Deletedinuse: 56
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    44030
% 2.75/3.19  Kept:         14304
% 2.75/3.19  Inuse:        468
% 2.75/3.19  Deleted:      86
% 2.75/3.19  Deletedinuse: 69
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    49208
% 2.75/3.19  Kept:         17068
% 2.75/3.19  Inuse:        489
% 2.75/3.19  Deleted:      88
% 2.75/3.19  Deletedinuse: 71
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  Done
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  Intermediate Status:
% 2.75/3.19  Generated:    54876
% 2.75/3.19  Kept:         19090
% 2.75/3.19  Inuse:        502
% 2.75/3.19  Deleted:      89
% 2.75/3.19  Deletedinuse: 72
% 2.75/3.19  
% 2.75/3.19  Resimplifying inuse:
% 2.75/3.19  
% 2.75/3.19  Bliksems!, er is een bewijs:
% 2.75/3.19  % SZS status Unsatisfiable
% 2.75/3.19  % SZS output start Refutation
% 2.75/3.19  
% 2.75/3.19  clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 5, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 6, [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), =( X, Z
% 2.75/3.19     ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 8, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    'unordered_pair'( Y, X ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 10, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 122, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 125, [ =( 'unordered_pair'( y, z ), singleton( x ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 126, [ member( x, 'universal_class' ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 127, [ ~( =( y, x ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 128, [ ~( =( z, x ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 129, [ ~( =( X, Y ) ), ~( member( Z, 'unordered_pair'( X, Y ) ) ), 
% 2.75/3.19    =( Z, Y ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 161, [ =( X, Y ), ~( =( Y, X ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 450, [ member( x, 'unordered_pair'( X, x ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 482, [ member( x, singleton( x ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 588, [ ~( =( X, x ) ), ~( =( X, y ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 589, [ ~( =( X, x ) ), ~( =( X, z ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 15188, [ ~( member( X, singleton( x ) ) ), ~( =( X, y ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 19166, [ ~( member( X, singleton( x ) ) ), =( X, z ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 19340, [ ~( =( X, x ) ), ~( member( Y, 'unordered_pair'( X, x ) ) )
% 2.75/3.19    , ~( =( Y, z ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 20977, [ ~( member( X, singleton( x ) ) ) ] )
% 2.75/3.19  .
% 2.75/3.19  clause( 20978, [] )
% 2.75/3.19  .
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  % SZS output end Refutation
% 2.75/3.19  found a proof!
% 2.75/3.19  
% 2.75/3.19  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 2.75/3.19  
% 2.75/3.19  initialclauses(
% 2.75/3.19  [ clause( 20980, [ ~( subclass( X, Y ) ), ~( member( Z, X ) ), member( Z, Y
% 2.75/3.19     ) ] )
% 2.75/3.19  , clause( 20981, [ member( 'not_subclass_element'( X, Y ), X ), subclass( X
% 2.75/3.19    , Y ) ] )
% 2.75/3.19  , clause( 20982, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), 
% 2.75/3.19    subclass( X, Y ) ] )
% 2.75/3.19  , clause( 20983, [ subclass( X, 'universal_class' ) ] )
% 2.75/3.19  , clause( 20984, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.75/3.19  , clause( 20985, [ ~( =( X, Y ) ), subclass( Y, X ) ] )
% 2.75/3.19  , clause( 20986, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y )
% 2.75/3.19     ] )
% 2.75/3.19  , clause( 20987, [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), 
% 2.75/3.19    =( X, Z ) ] )
% 2.75/3.19  , clause( 20988, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    'unordered_pair'( X, Y ) ) ] )
% 2.75/3.19  , clause( 20989, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    'unordered_pair'( Y, X ) ) ] )
% 2.75/3.19  , clause( 20990, [ member( 'unordered_pair'( X, Y ), 'universal_class' ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 20991, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.75/3.19  , clause( 20992, [ =( 'unordered_pair'( singleton( X ), 'unordered_pair'( X
% 2.75/3.19    , singleton( Y ) ) ), 'ordered_pair'( X, Y ) ) ] )
% 2.75/3.19  , clause( 20993, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( X, Z ) ] )
% 2.75/3.19  , clause( 20994, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( Y, T ) ] )
% 2.75/3.19  , clause( 20995, [ ~( member( X, Y ) ), ~( member( Z, T ) ), member( 
% 2.75/3.19    'ordered_pair'( X, Z ), 'cross_product'( Y, T ) ) ] )
% 2.75/3.19  , clause( 20996, [ ~( member( X, 'cross_product'( Y, Z ) ) ), =( 
% 2.75/3.19    'ordered_pair'( first( X ), second( X ) ), X ) ] )
% 2.75/3.19  , clause( 20997, [ subclass( 'element_relation', 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 20998, [ ~( member( 'ordered_pair'( X, Y ), 'element_relation' )
% 2.75/3.19     ), member( X, Y ) ] )
% 2.75/3.19  , clause( 20999, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ), ~( member( X, Y ) ), member( 
% 2.75/3.19    'ordered_pair'( X, Y ), 'element_relation' ) ] )
% 2.75/3.19  , clause( 21000, [ ~( member( X, intersection( Y, Z ) ) ), member( X, Y ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21001, [ ~( member( X, intersection( Y, Z ) ) ), member( X, Z ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21002, [ ~( member( X, Y ) ), ~( member( X, Z ) ), member( X, 
% 2.75/3.19    intersection( Y, Z ) ) ] )
% 2.75/3.19  , clause( 21003, [ ~( member( X, complement( Y ) ) ), ~( member( X, Y ) ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21004, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    complement( Y ) ), member( X, Y ) ] )
% 2.75/3.19  , clause( 21005, [ =( complement( intersection( complement( X ), complement( 
% 2.75/3.19    Y ) ) ), union( X, Y ) ) ] )
% 2.75/3.19  , clause( 21006, [ =( intersection( complement( intersection( X, Y ) ), 
% 2.75/3.19    complement( intersection( complement( X ), complement( Y ) ) ) ), 
% 2.75/3.19    'symmetric_difference'( X, Y ) ) ] )
% 2.75/3.19  , clause( 21007, [ =( intersection( X, 'cross_product'( Y, Z ) ), restrict( 
% 2.75/3.19    X, Y, Z ) ) ] )
% 2.75/3.19  , clause( 21008, [ =( intersection( 'cross_product'( X, Y ), Z ), restrict( 
% 2.75/3.19    Z, X, Y ) ) ] )
% 2.75/3.19  , clause( 21009, [ ~( =( restrict( X, singleton( Y ), 'universal_class' ), 
% 2.75/3.19    'null_class' ) ), ~( member( Y, 'domain_of'( X ) ) ) ] )
% 2.75/3.19  , clause( 21010, [ ~( member( X, 'universal_class' ) ), =( restrict( Y, 
% 2.75/3.19    singleton( X ), 'universal_class' ), 'null_class' ), member( X, 
% 2.75/3.19    'domain_of'( Y ) ) ] )
% 2.75/3.19  , clause( 21011, [ subclass( rotate( X ), 'cross_product'( 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ), 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 21012, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.75/3.19    rotate( T ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, Z ), X ), T )
% 2.75/3.19     ] )
% 2.75/3.19  , clause( 21013, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.75/3.19    T ) ), ~( member( 'ordered_pair'( 'ordered_pair'( Z, X ), Y ), 
% 2.75/3.19    'cross_product'( 'cross_product'( 'universal_class', 'universal_class' )
% 2.75/3.19    , 'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Z, X )
% 2.75/3.19    , Y ), rotate( T ) ) ] )
% 2.75/3.19  , clause( 21014, [ subclass( flip( X ), 'cross_product'( 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ), 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 21015, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.75/3.19    flip( T ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), T ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21016, [ ~( member( 'ordered_pair'( 'ordered_pair'( X, Y ), Z ), 
% 2.75/3.19    T ) ), ~( member( 'ordered_pair'( 'ordered_pair'( Y, X ), Z ), 
% 2.75/3.19    'cross_product'( 'cross_product'( 'universal_class', 'universal_class' )
% 2.75/3.19    , 'universal_class' ) ) ), member( 'ordered_pair'( 'ordered_pair'( Y, X )
% 2.75/3.19    , Z ), flip( T ) ) ] )
% 2.75/3.19  , clause( 21017, [ =( 'domain_of'( flip( 'cross_product'( X, 
% 2.75/3.19    'universal_class' ) ) ), inverse( X ) ) ] )
% 2.75/3.19  , clause( 21018, [ =( 'domain_of'( inverse( X ) ), 'range_of'( X ) ) ] )
% 2.75/3.19  , clause( 21019, [ =( first( 'not_subclass_element'( restrict( X, Y, 
% 2.75/3.19    singleton( Z ) ), 'null_class' ) ), domain( X, Y, Z ) ) ] )
% 2.75/3.19  , clause( 21020, [ =( second( 'not_subclass_element'( restrict( X, 
% 2.75/3.19    singleton( Y ), Z ), 'null_class' ) ), range( X, Y, Z ) ) ] )
% 2.75/3.19  , clause( 21021, [ =( 'range_of'( restrict( X, Y, 'universal_class' ) ), 
% 2.75/3.19    image( X, Y ) ) ] )
% 2.75/3.19  , clause( 21022, [ =( union( X, singleton( X ) ), successor( X ) ) ] )
% 2.75/3.19  , clause( 21023, [ subclass( 'successor_relation', 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 21024, [ ~( member( 'ordered_pair'( X, Y ), 'successor_relation'
% 2.75/3.19     ) ), =( successor( X ), Y ) ] )
% 2.75/3.19  , clause( 21025, [ ~( =( successor( X ), Y ) ), ~( member( 'ordered_pair'( 
% 2.75/3.19    X, Y ), 'cross_product'( 'universal_class', 'universal_class' ) ) ), 
% 2.75/3.19    member( 'ordered_pair'( X, Y ), 'successor_relation' ) ] )
% 2.75/3.19  , clause( 21026, [ ~( inductive( X ) ), member( 'null_class', X ) ] )
% 2.75/3.19  , clause( 21027, [ ~( inductive( X ) ), subclass( image( 
% 2.75/3.19    'successor_relation', X ), X ) ] )
% 2.75/3.19  , clause( 21028, [ ~( member( 'null_class', X ) ), ~( subclass( image( 
% 2.75/3.19    'successor_relation', X ), X ) ), inductive( X ) ] )
% 2.75/3.19  , clause( 21029, [ inductive( omega ) ] )
% 2.75/3.19  , clause( 21030, [ ~( inductive( X ) ), subclass( omega, X ) ] )
% 2.75/3.19  , clause( 21031, [ member( omega, 'universal_class' ) ] )
% 2.75/3.19  , clause( 21032, [ =( 'domain_of'( restrict( 'element_relation', 
% 2.75/3.19    'universal_class', X ) ), 'sum_class'( X ) ) ] )
% 2.75/3.19  , clause( 21033, [ ~( member( X, 'universal_class' ) ), member( 'sum_class'( 
% 2.75/3.19    X ), 'universal_class' ) ] )
% 2.75/3.19  , clause( 21034, [ =( complement( image( 'element_relation', complement( X
% 2.75/3.19     ) ) ), 'power_class'( X ) ) ] )
% 2.75/3.19  , clause( 21035, [ ~( member( X, 'universal_class' ) ), member( 
% 2.75/3.19    'power_class'( X ), 'universal_class' ) ] )
% 2.75/3.19  , clause( 21036, [ subclass( compose( X, Y ), 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 21037, [ ~( member( 'ordered_pair'( X, Y ), compose( Z, T ) ) ), 
% 2.75/3.19    member( Y, image( Z, image( T, singleton( X ) ) ) ) ] )
% 2.75/3.19  , clause( 21038, [ ~( member( X, image( Y, image( Z, singleton( T ) ) ) ) )
% 2.75/3.19    , ~( member( 'ordered_pair'( T, X ), 'cross_product'( 'universal_class', 
% 2.75/3.19    'universal_class' ) ) ), member( 'ordered_pair'( T, X ), compose( Y, Z )
% 2.75/3.19     ) ] )
% 2.75/3.19  , clause( 21039, [ ~( 'single_valued_class'( X ) ), subclass( compose( X, 
% 2.75/3.19    inverse( X ) ), 'identity_relation' ) ] )
% 2.75/3.19  , clause( 21040, [ ~( subclass( compose( X, inverse( X ) ), 
% 2.75/3.19    'identity_relation' ) ), 'single_valued_class'( X ) ] )
% 2.75/3.19  , clause( 21041, [ ~( function( X ) ), subclass( X, 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ] )
% 2.75/3.19  , clause( 21042, [ ~( function( X ) ), subclass( compose( X, inverse( X ) )
% 2.75/3.19    , 'identity_relation' ) ] )
% 2.75/3.19  , clause( 21043, [ ~( subclass( X, 'cross_product'( 'universal_class', 
% 2.75/3.19    'universal_class' ) ) ), ~( subclass( compose( X, inverse( X ) ), 
% 2.75/3.19    'identity_relation' ) ), function( X ) ] )
% 2.75/3.19  , clause( 21044, [ ~( function( X ) ), ~( member( Y, 'universal_class' ) )
% 2.75/3.19    , member( image( X, Y ), 'universal_class' ) ] )
% 2.75/3.19  , clause( 21045, [ =( X, 'null_class' ), member( regular( X ), X ) ] )
% 2.75/3.19  , clause( 21046, [ =( X, 'null_class' ), =( intersection( X, regular( X ) )
% 2.75/3.19    , 'null_class' ) ] )
% 2.75/3.19  , clause( 21047, [ =( 'sum_class'( image( X, singleton( Y ) ) ), apply( X, 
% 2.75/3.19    Y ) ) ] )
% 2.75/3.19  , clause( 21048, [ function( choice ) ] )
% 2.75/3.19  , clause( 21049, [ ~( member( X, 'universal_class' ) ), =( X, 'null_class'
% 2.75/3.19     ), member( apply( choice, X ), X ) ] )
% 2.75/3.19  , clause( 21050, [ ~( 'one_to_one'( X ) ), function( X ) ] )
% 2.75/3.19  , clause( 21051, [ ~( 'one_to_one'( X ) ), function( inverse( X ) ) ] )
% 2.75/3.19  , clause( 21052, [ ~( function( inverse( X ) ) ), ~( function( X ) ), 
% 2.75/3.19    'one_to_one'( X ) ] )
% 2.75/3.19  , clause( 21053, [ =( intersection( 'cross_product'( 'universal_class', 
% 2.75/3.19    'universal_class' ), intersection( 'cross_product'( 'universal_class', 
% 2.75/3.19    'universal_class' ), complement( compose( complement( 'element_relation'
% 2.75/3.19     ), inverse( 'element_relation' ) ) ) ) ), 'subset_relation' ) ] )
% 2.75/3.19  , clause( 21054, [ =( intersection( inverse( 'subset_relation' ), 
% 2.75/3.19    'subset_relation' ), 'identity_relation' ) ] )
% 2.75/3.19  , clause( 21055, [ =( complement( 'domain_of'( intersection( X, 
% 2.75/3.19    'identity_relation' ) ) ), diagonalise( X ) ) ] )
% 2.75/3.19  , clause( 21056, [ =( intersection( 'domain_of'( X ), diagonalise( compose( 
% 2.75/3.19    inverse( 'element_relation' ), X ) ) ), cantor( X ) ) ] )
% 2.75/3.19  , clause( 21057, [ ~( operation( X ) ), function( X ) ] )
% 2.75/3.19  , clause( 21058, [ ~( operation( X ) ), =( 'cross_product'( 'domain_of'( 
% 2.75/3.19    'domain_of'( X ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) )
% 2.75/3.19     ] )
% 2.75/3.19  , clause( 21059, [ ~( operation( X ) ), subclass( 'range_of'( X ), 
% 2.75/3.19    'domain_of'( 'domain_of'( X ) ) ) ] )
% 2.75/3.19  , clause( 21060, [ ~( function( X ) ), ~( =( 'cross_product'( 'domain_of'( 
% 2.75/3.19    'domain_of'( X ) ), 'domain_of'( 'domain_of'( X ) ) ), 'domain_of'( X ) )
% 2.75/3.19     ), ~( subclass( 'range_of'( X ), 'domain_of'( 'domain_of'( X ) ) ) ), 
% 2.75/3.19    operation( X ) ] )
% 2.75/3.19  , clause( 21061, [ ~( compatible( X, Y, Z ) ), function( X ) ] )
% 2.75/3.19  , clause( 21062, [ ~( compatible( X, Y, Z ) ), =( 'domain_of'( 'domain_of'( 
% 2.75/3.19    Y ) ), 'domain_of'( X ) ) ] )
% 2.75/3.19  , clause( 21063, [ ~( compatible( X, Y, Z ) ), subclass( 'range_of'( X ), 
% 2.75/3.19    'domain_of'( 'domain_of'( Z ) ) ) ] )
% 2.75/3.19  , clause( 21064, [ ~( function( X ) ), ~( =( 'domain_of'( 'domain_of'( Y )
% 2.75/3.19     ), 'domain_of'( X ) ) ), ~( subclass( 'range_of'( X ), 'domain_of'( 
% 2.75/3.19    'domain_of'( Z ) ) ) ), compatible( X, Y, Z ) ] )
% 2.75/3.19  , clause( 21065, [ ~( homomorphism( X, Y, Z ) ), operation( Y ) ] )
% 2.75/3.19  , clause( 21066, [ ~( homomorphism( X, Y, Z ) ), operation( Z ) ] )
% 2.75/3.19  , clause( 21067, [ ~( homomorphism( X, Y, Z ) ), compatible( X, Y, Z ) ] )
% 2.75/3.19  , clause( 21068, [ ~( homomorphism( X, Y, Z ) ), ~( member( 'ordered_pair'( 
% 2.75/3.19    T, U ), 'domain_of'( Y ) ) ), =( apply( Z, 'ordered_pair'( apply( X, T )
% 2.75/3.19    , apply( X, U ) ) ), apply( X, apply( Y, 'ordered_pair'( T, U ) ) ) ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21069, [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( 
% 2.75/3.19    Z, X, Y ) ), member( 'ordered_pair'( 'not_homomorphism1'( Z, X, Y ), 
% 2.75/3.19    'not_homomorphism2'( Z, X, Y ) ), 'domain_of'( X ) ), homomorphism( Z, X
% 2.75/3.19    , Y ) ] )
% 2.75/3.19  , clause( 21070, [ ~( operation( X ) ), ~( operation( Y ) ), ~( compatible( 
% 2.75/3.19    Z, X, Y ) ), ~( =( apply( Y, 'ordered_pair'( apply( Z, 
% 2.75/3.19    'not_homomorphism1'( Z, X, Y ) ), apply( Z, 'not_homomorphism2'( Z, X, Y
% 2.75/3.19     ) ) ) ), apply( Z, apply( X, 'ordered_pair'( 'not_homomorphism1'( Z, X, 
% 2.75/3.19    Y ), 'not_homomorphism2'( Z, X, Y ) ) ) ) ) ), homomorphism( Z, X, Y ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21071, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( X, 'unordered_pair'( X, Y ) ) ] )
% 2.75/3.19  , clause( 21072, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( Y, 'unordered_pair'( X, Y ) ) ] )
% 2.75/3.19  , clause( 21073, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( X, 'universal_class' ) ] )
% 2.75/3.19  , clause( 21074, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), member( Y, 'universal_class' ) ] )
% 2.75/3.19  , clause( 21075, [ subclass( X, X ) ] )
% 2.75/3.19  , clause( 21076, [ ~( subclass( X, Y ) ), ~( subclass( Y, Z ) ), subclass( 
% 2.75/3.19    X, Z ) ] )
% 2.75/3.19  , clause( 21077, [ =( X, Y ), member( 'not_subclass_element'( X, Y ), X ), 
% 2.75/3.19    member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.75/3.19  , clause( 21078, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( X, 
% 2.75/3.19    Y ), member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.75/3.19  , clause( 21079, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), =( Y, 
% 2.75/3.19    X ), member( 'not_subclass_element'( Y, X ), Y ) ] )
% 2.75/3.19  , clause( 21080, [ ~( member( 'not_subclass_element'( X, Y ), Y ) ), ~( 
% 2.75/3.19    member( 'not_subclass_element'( Y, X ), X ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 21081, [ ~( member( X, intersection( complement( Y ), Y ) ) ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21082, [ ~( member( X, 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21083, [ subclass( 'null_class', X ) ] )
% 2.75/3.19  , clause( 21084, [ ~( subclass( X, 'null_class' ) ), =( X, 'null_class' ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21085, [ =( X, 'null_class' ), member( 'not_subclass_element'( X
% 2.75/3.19    , 'null_class' ), X ) ] )
% 2.75/3.19  , clause( 21086, [ member( 'null_class', 'universal_class' ) ] )
% 2.75/3.19  , clause( 21087, [ =( 'unordered_pair'( X, Y ), 'unordered_pair'( Y, X ) )
% 2.75/3.19     ] )
% 2.75/3.19  , clause( 21088, [ subclass( singleton( X ), 'unordered_pair'( X, Y ) ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21089, [ subclass( singleton( X ), 'unordered_pair'( Y, X ) ) ]
% 2.75/3.19     )
% 2.75/3.19  , clause( 21090, [ member( X, 'universal_class' ), =( 'unordered_pair'( Y, 
% 2.75/3.19    X ), singleton( Y ) ) ] )
% 2.75/3.19  , clause( 21091, [ member( X, 'universal_class' ), =( 'unordered_pair'( X, 
% 2.75/3.19    Y ), singleton( Y ) ) ] )
% 2.75/3.19  , clause( 21092, [ =( 'unordered_pair'( X, Y ), 'null_class' ), member( X, 
% 2.75/3.19    'universal_class' ), member( Y, 'universal_class' ) ] )
% 2.75/3.19  , clause( 21093, [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( X, Z )
% 2.75/3.19     ) ), ~( member( 'ordered_pair'( Y, Z ), 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ), =( Y, Z ) ] )
% 2.75/3.19  , clause( 21094, [ ~( =( 'unordered_pair'( X, Y ), 'unordered_pair'( Z, Y )
% 2.75/3.19     ) ), ~( member( 'ordered_pair'( X, Z ), 'cross_product'( 
% 2.75/3.19    'universal_class', 'universal_class' ) ) ), =( X, Z ) ] )
% 2.75/3.19  , clause( 21095, [ ~( member( X, 'universal_class' ) ), ~( =( 
% 2.75/3.19    'unordered_pair'( X, Y ), 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21096, [ ~( member( X, 'universal_class' ) ), ~( =( 
% 2.75/3.19    'unordered_pair'( Y, X ), 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21097, [ ~( member( 'ordered_pair'( X, Y ), 'cross_product'( Z, T
% 2.75/3.19     ) ) ), ~( =( 'unordered_pair'( X, Y ), 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21098, [ ~( member( X, Y ) ), ~( member( Z, Y ) ), subclass( 
% 2.75/3.19    'unordered_pair'( X, Z ), Y ) ] )
% 2.75/3.19  , clause( 21099, [ member( singleton( X ), 'universal_class' ) ] )
% 2.75/3.19  , clause( 21100, [ member( singleton( X ), 'unordered_pair'( Y, singleton( 
% 2.75/3.19    X ) ) ) ] )
% 2.75/3.19  , clause( 21101, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    singleton( X ) ) ] )
% 2.75/3.19  , clause( 21102, [ ~( member( X, 'universal_class' ) ), ~( =( singleton( X
% 2.75/3.19     ), 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21103, [ member( 'null_class', singleton( 'null_class' ) ) ] )
% 2.75/3.19  , clause( 21104, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 21105, [ member( X, 'universal_class' ), =( singleton( X ), 
% 2.75/3.19    'null_class' ) ] )
% 2.75/3.19  , clause( 21106, [ ~( =( singleton( X ), singleton( Y ) ) ), ~( member( X, 
% 2.75/3.19    'universal_class' ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 21107, [ ~( =( singleton( X ), singleton( Y ) ) ), ~( member( Y, 
% 2.75/3.19    'universal_class' ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 21108, [ =( 'unordered_pair'( y, z ), singleton( x ) ) ] )
% 2.75/3.19  , clause( 21109, [ member( x, 'universal_class' ) ] )
% 2.75/3.19  , clause( 21110, [ ~( =( x, y ) ) ] )
% 2.75/3.19  , clause( 21111, [ ~( =( x, z ) ) ] )
% 2.75/3.19  ] ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 4, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.75/3.19  , clause( 20984, [ ~( =( X, Y ) ), subclass( X, Y ) ] )
% 2.75/3.19  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.75/3.19     ), ==>( 1, 1 )] ) ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 5, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 20986, [ ~( subclass( X, Y ) ), ~( subclass( Y, X ) ), =( X, Y )
% 2.75/3.19     ] )
% 2.75/3.19  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.75/3.19     ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 6, [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), =( X, Z
% 2.75/3.19     ) ] )
% 2.75/3.19  , clause( 20987, [ ~( member( X, 'unordered_pair'( Y, Z ) ) ), =( X, Y ), 
% 2.75/3.19    =( X, Z ) ] )
% 2.75/3.19  , substitution( 0, [ :=( X, X ), :=( Y, Y ), :=( Z, Z )] ), 
% 2.75/3.19    permutation( 0, [ ==>( 0, 0 ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 8, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    'unordered_pair'( Y, X ) ) ] )
% 2.75/3.19  , clause( 20989, [ ~( member( X, 'universal_class' ) ), member( X, 
% 2.75/3.19    'unordered_pair'( Y, X ) ) ] )
% 2.75/3.19  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 2.75/3.19     ), ==>( 1, 1 )] ) ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 10, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.75/3.19  , clause( 20991, [ =( 'unordered_pair'( X, X ), singleton( X ) ) ] )
% 2.75/3.19  , substitution( 0, [ :=( X, X )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 2.75/3.19  
% 2.75/3.19  
% 2.75/3.19  subsumption(
% 2.75/3.19  clause( 122, [ ~( member( X, singleton( Y ) ) ), =( X, Y ) ] )
% 2.75/3.19  , clause( 21104, [ ~( member( X, singletonCputime limit exceeded (core dumped)
%------------------------------------------------------------------------------