TSTP Solution File: SYN012-1 by Bliksem---1.12

View Problem - Process Solution

%------------------------------------------------------------------------------
% File     : Bliksem---1.12
% Problem  : SYN012-1 : TPTP v8.1.0. Released v1.1.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : bliksem %s

% Computer : n006.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 : Thu Jul 21 02:46:45 EDT 2022

% Result   : Unsatisfiable 0.84s 1.20s
% Output   : Refutation 0.84s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.07/0.13  % Problem  : SYN012-1 : TPTP v8.1.0. Released v1.1.0.
% 0.07/0.14  % Command  : bliksem %s
% 0.15/0.35  % Computer : n006.cluster.edu
% 0.15/0.35  % Model    : x86_64 x86_64
% 0.15/0.35  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.15/0.35  % Memory   : 8042.1875MB
% 0.15/0.35  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.15/0.35  % CPULimit : 300
% 0.15/0.36  % DateTime : Tue Jul 12 01:12:35 EDT 2022
% 0.15/0.36  % CPUTime  : 
% 0.84/1.20  *** allocated 10000 integers for termspace/termends
% 0.84/1.20  *** allocated 10000 integers for clauses
% 0.84/1.20  *** allocated 10000 integers for justifications
% 0.84/1.20  Bliksem 1.12
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  Automatic Strategy Selection
% 0.84/1.20  
% 0.84/1.20  Clauses:
% 0.84/1.20  [
% 0.84/1.20     [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 'big_g'( Y, g( X, 
% 0.84/1.20    Y ) ) ],
% 0.84/1.20     [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( Y, g( X, Y
% 0.84/1.20     ) ) ) ],
% 0.84/1.20     [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) ), 'big_g'( g( 
% 0.84/1.20    X, Y ), g( X, Y ) ) ],
% 0.84/1.20     [ 'big_f'( X, Y ), 'big_f'( g( X, Y ), g( X, Y ) ) ],
% 0.84/1.20     [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ],
% 0.84/1.20     [ 'big_g'( X, Y ), 'big_g'( g( X, Y ), g( X, Y ) ) ],
% 0.84/1.20     [ ~( 'big_g'( X, Y ) ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ]
% 0.84/1.20  ] .
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  percentage equality = 0.000000, percentage horn = 0.714286
% 0.84/1.20  This a non-horn, non-equality problem
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  Options Used:
% 0.84/1.20  
% 0.84/1.20  useres =            1
% 0.84/1.20  useparamod =        0
% 0.84/1.20  useeqrefl =         0
% 0.84/1.20  useeqfact =         0
% 0.84/1.20  usefactor =         1
% 0.84/1.20  usesimpsplitting =  0
% 0.84/1.20  usesimpdemod =      0
% 0.84/1.20  usesimpres =        3
% 0.84/1.20  
% 0.84/1.20  resimpinuse      =  1000
% 0.84/1.20  resimpclauses =     20000
% 0.84/1.20  substype =          standard
% 0.84/1.20  backwardsubs =      1
% 0.84/1.20  selectoldest =      5
% 0.84/1.20  
% 0.84/1.20  litorderings [0] =  split
% 0.84/1.20  litorderings [1] =  liftord
% 0.84/1.20  
% 0.84/1.20  termordering =      none
% 0.84/1.20  
% 0.84/1.20  litapriori =        1
% 0.84/1.20  termapriori =       0
% 0.84/1.20  litaposteriori =    0
% 0.84/1.20  termaposteriori =   0
% 0.84/1.20  demodaposteriori =  0
% 0.84/1.20  ordereqreflfact =   0
% 0.84/1.20  
% 0.84/1.20  litselect =         none
% 0.84/1.20  
% 0.84/1.20  maxweight =         15
% 0.84/1.20  maxdepth =          30000
% 0.84/1.20  maxlength =         115
% 0.84/1.20  maxnrvars =         195
% 0.84/1.20  excuselevel =       1
% 0.84/1.20  increasemaxweight = 1
% 0.84/1.20  
% 0.84/1.20  maxselected =       10000000
% 0.84/1.20  maxnrclauses =      10000000
% 0.84/1.20  
% 0.84/1.20  showgenerated =    0
% 0.84/1.20  showkept =         0
% 0.84/1.20  showselected =     0
% 0.84/1.20  showdeleted =      0
% 0.84/1.20  showresimp =       1
% 0.84/1.20  showstatus =       2000
% 0.84/1.20  
% 0.84/1.20  prologoutput =     1
% 0.84/1.20  nrgoals =          5000000
% 0.84/1.20  totalproof =       1
% 0.84/1.20  
% 0.84/1.20  Symbols occurring in the translation:
% 0.84/1.20  
% 0.84/1.20  {}  [0, 0]      (w:1, o:2, a:1, s:1, b:0), 
% 0.84/1.20  .  [1, 2]      (w:1, o:16, a:1, s:1, b:0), 
% 0.84/1.20  !  [4, 1]      (w:0, o:11, a:1, s:1, b:0), 
% 0.84/1.20  =  [13, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.84/1.20  ==>  [14, 2]      (w:1, o:0, a:0, s:1, b:0), 
% 0.84/1.20  'big_f'  [41, 2]      (w:1, o:41, a:1, s:1, b:0), 
% 0.84/1.20  g  [42, 2]      (w:1, o:42, a:1, s:1, b:0), 
% 0.84/1.20  'big_g'  [43, 2]      (w:1, o:43, a:1, s:1, b:0).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  Starting Search:
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  Bliksems!, er is een bewijs:
% 0.84/1.20  % SZS status Unsatisfiable
% 0.84/1.20  % SZS output start Refutation
% 0.84/1.20  
% 0.84/1.20  clause( 0, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 'big_g'( Y
% 0.84/1.20    , g( X, Y ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 1, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( Y, 
% 0.84/1.20    g( X, Y ) ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 2, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) ), 
% 0.84/1.20    'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 3, [ 'big_f'( g( X, Y ), g( X, Y ) ), 'big_f'( X, Y ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 4, [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 5, [ 'big_g'( g( X, Y ), g( X, Y ) ), 'big_g'( X, Y ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 6, [ ~( 'big_g'( g( X, Y ), g( X, Y ) ) ), ~( 'big_g'( X, Y ) ) ]
% 0.84/1.20     )
% 0.84/1.20  .
% 0.84/1.20  clause( 9, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 13, [ 'big_f'( X, g( X, Y ) ), 'big_f'( Y, g( X, Y ) ), ~( 'big_f'( 
% 0.84/1.20    X, Y ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 15, [ ~( 'big_f'( X, X ) ), 'big_f'( X, g( X, X ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 18, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 19, [ ~( 'big_f'( X, Y ) ), ~( 'big_g'( X, Y ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 21, [ ~( 'big_f'( Y, X ) ), ~( 'big_f'( Y, g( Y, X ) ) ), ~( 
% 0.84/1.20    'big_f'( X, g( Y, X ) ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 23, [ ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  .
% 0.84/1.20  clause( 26, [] )
% 0.84/1.20  .
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  % SZS output end Refutation
% 0.84/1.20  found a proof!
% 0.84/1.20  
% 0.84/1.20  % ABCDEFGHIJKLMNOPQRSTUVWXYZ
% 0.84/1.20  
% 0.84/1.20  initialclauses(
% 0.84/1.20  [ clause( 28, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 'big_g'( 
% 0.84/1.20    Y, g( X, Y ) ) ] )
% 0.84/1.20  , clause( 29, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( 
% 0.84/1.20    Y, g( X, Y ) ) ) ] )
% 0.84/1.20  , clause( 30, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) )
% 0.84/1.20    , 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 31, [ 'big_f'( X, Y ), 'big_f'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 32, [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ] )
% 0.84/1.20  , clause( 33, [ 'big_g'( X, Y ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 34, [ ~( 'big_g'( X, Y ) ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) )
% 0.84/1.20     ] )
% 0.84/1.20  ] ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 0, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 'big_g'( Y
% 0.84/1.20    , g( X, Y ) ) ] )
% 0.84/1.20  , clause( 28, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 'big_g'( 
% 0.84/1.20    Y, g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 1, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( Y, 
% 0.84/1.20    g( X, Y ) ) ) ] )
% 0.84/1.20  , clause( 29, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( 
% 0.84/1.20    Y, g( X, Y ) ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 2, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) ), 
% 0.84/1.20    'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 30, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) )
% 0.84/1.20    , 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 ), ==>( 2, 2 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 3, [ 'big_f'( g( X, Y ), g( X, Y ) ), 'big_f'( X, Y ) ] )
% 0.84/1.20  , clause( 31, [ 'big_f'( X, Y ), 'big_f'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 1
% 0.84/1.20     ), ==>( 1, 0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 4, [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ] )
% 0.84/1.20  , clause( 32, [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 5, [ 'big_g'( g( X, Y ), g( X, Y ) ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , clause( 33, [ 'big_g'( X, Y ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 1
% 0.84/1.20     ), ==>( 1, 0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 6, [ ~( 'big_g'( g( X, Y ), g( X, Y ) ) ), ~( 'big_g'( X, Y ) ) ]
% 0.84/1.20     )
% 0.84/1.20  , clause( 34, [ ~( 'big_g'( X, Y ) ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) )
% 0.84/1.20     ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 1
% 0.84/1.20     ), ==>( 1, 0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 35, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , clause( 4, [ 'big_f'( X, Y ), ~( 'big_g'( g( X, Y ), g( X, Y ) ) ) ] )
% 0.84/1.20  , 1, clause( 5, [ 'big_g'( g( X, Y ), g( X, Y ) ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y )] ), substitution( 1, [ :=( X
% 0.84/1.20    , X ), :=( Y, Y )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 9, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , clause( 35, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 38, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), 'big_f'( Y, g( 
% 0.84/1.20    X, Y ) ) ] )
% 0.84/1.20  , clause( 1, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), ~( 'big_g'( Y
% 0.84/1.20    , g( X, Y ) ) ) ] )
% 0.84/1.20  , 2, clause( 9, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , 1, substitution( 0, [ :=( X, X ), :=( Y, Y )] ), substitution( 1, [ :=( X
% 0.84/1.20    , Y ), :=( Y, g( X, Y ) )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 13, [ 'big_f'( X, g( X, Y ) ), 'big_f'( Y, g( X, Y ) ), ~( 'big_f'( 
% 0.84/1.20    X, Y ) ) ] )
% 0.84/1.20  , clause( 38, [ ~( 'big_f'( X, Y ) ), 'big_f'( X, g( X, Y ) ), 'big_f'( Y, 
% 0.84/1.20    g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 2
% 0.84/1.20     ), ==>( 1, 0 ), ==>( 2, 1 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  factor(
% 0.84/1.20  clause( 40, [ 'big_f'( X, g( X, X ) ), ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , clause( 13, [ 'big_f'( X, g( X, Y ) ), 'big_f'( Y, g( X, Y ) ), ~( 
% 0.84/1.20    'big_f'( X, Y ) ) ] )
% 0.84/1.20  , 0, 1, substitution( 0, [ :=( X, X ), :=( Y, X )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 15, [ ~( 'big_f'( X, X ) ), 'big_f'( X, g( X, X ) ) ] )
% 0.84/1.20  , clause( 40, [ 'big_f'( X, g( X, X ) ), ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X )] ), permutation( 0, [ ==>( 0, 1 ), ==>( 1, 
% 0.84/1.20    0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 42, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ), 
% 0.84/1.20    'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 2, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( g( X, Y ), g( X, Y ) ) ), 
% 0.84/1.20    'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , 1, clause( 9, [ 'big_f'( X, Y ), 'big_g'( X, Y ) ] )
% 0.84/1.20  , 0, substitution( 0, [ :=( X, X ), :=( Y, Y )] ), substitution( 1, [ :=( X
% 0.84/1.20    , g( X, Y ) ), :=( Y, g( X, Y ) )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  factor(
% 0.84/1.20  clause( 43, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 42, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ), 
% 0.84/1.20    'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , 1, 2, substitution( 0, [ :=( X, X ), :=( Y, Y )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 18, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , clause( 43, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 0
% 0.84/1.20     ), ==>( 1, 1 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 44, [ ~( 'big_g'( X, Y ) ), ~( 'big_f'( X, Y ) ) ] )
% 0.84/1.20  , clause( 6, [ ~( 'big_g'( g( X, Y ), g( X, Y ) ) ), ~( 'big_g'( X, Y ) ) ]
% 0.84/1.20     )
% 0.84/1.20  , 0, clause( 18, [ ~( 'big_f'( X, Y ) ), 'big_g'( g( X, Y ), g( X, Y ) ) ]
% 0.84/1.20     )
% 0.84/1.20  , 1, substitution( 0, [ :=( X, X ), :=( Y, Y )] ), substitution( 1, [ :=( X
% 0.84/1.20    , X ), :=( Y, Y )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 19, [ ~( 'big_f'( X, Y ) ), ~( 'big_g'( X, Y ) ) ] )
% 0.84/1.20  , clause( 44, [ ~( 'big_g'( X, Y ) ), ~( 'big_f'( X, Y ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 1
% 0.84/1.20     ), ==>( 1, 0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 46, [ ~( 'big_f'( X, g( Y, X ) ) ), ~( 'big_f'( Y, X ) ), ~( 
% 0.84/1.20    'big_f'( Y, g( Y, X ) ) ) ] )
% 0.84/1.20  , clause( 19, [ ~( 'big_f'( X, Y ) ), ~( 'big_g'( X, Y ) ) ] )
% 0.84/1.20  , 1, clause( 0, [ ~( 'big_f'( X, Y ) ), ~( 'big_f'( X, g( X, Y ) ) ), 
% 0.84/1.20    'big_g'( Y, g( X, Y ) ) ] )
% 0.84/1.20  , 2, substitution( 0, [ :=( X, X ), :=( Y, g( Y, X ) )] ), substitution( 1
% 0.84/1.20    , [ :=( X, Y ), :=( Y, X )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 21, [ ~( 'big_f'( Y, X ) ), ~( 'big_f'( Y, g( Y, X ) ) ), ~( 
% 0.84/1.20    'big_f'( X, g( Y, X ) ) ) ] )
% 0.84/1.20  , clause( 46, [ ~( 'big_f'( X, g( Y, X ) ) ), ~( 'big_f'( Y, X ) ), ~( 
% 0.84/1.20    'big_f'( Y, g( Y, X ) ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X ), :=( Y, Y )] ), permutation( 0, [ ==>( 0, 2
% 0.84/1.20     ), ==>( 1, 0 ), ==>( 2, 1 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  factor(
% 0.84/1.20  clause( 48, [ ~( 'big_f'( X, X ) ), ~( 'big_f'( X, g( X, X ) ) ) ] )
% 0.84/1.20  , clause( 21, [ ~( 'big_f'( Y, X ) ), ~( 'big_f'( Y, g( Y, X ) ) ), ~( 
% 0.84/1.20    'big_f'( X, g( Y, X ) ) ) ] )
% 0.84/1.20  , 1, 2, substitution( 0, [ :=( X, X ), :=( Y, X )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  resolution(
% 0.84/1.20  clause( 49, [ ~( 'big_f'( X, X ) ), ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , clause( 48, [ ~( 'big_f'( X, X ) ), ~( 'big_f'( X, g( X, X ) ) ) ] )
% 0.84/1.20  , 1, clause( 15, [ ~( 'big_f'( X, X ) ), 'big_f'( X, g( X, X ) ) ] )
% 0.84/1.20  , 1, substitution( 0, [ :=( X, X )] ), substitution( 1, [ :=( X, X )] )
% 0.84/1.20    ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  factor(
% 0.84/1.20  clause( 50, [ ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , clause( 49, [ ~( 'big_f'( X, X ) ), ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , 0, 1, substitution( 0, [ :=( X, X )] )).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  subsumption(
% 0.84/1.20  clause( 23, [ ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , clause( 50, [ ~( 'big_f'( X, X ) ) ] )
% 0.84/1.20  , substitution( 0, [ :=( X, X )] ), permutation( 0, [ ==>( 0, 0 )] ) ).
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  ==> clause( 26, [] )
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  
% 0.84/1.20  !!! Internal Problem: OH, OH, COULD NOT DERIVE GOAL !!!
% 0.84/1.20  
% 0.84/1.20  Bliksem ended
%------------------------------------------------------------------------------