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Z3---4.15.1.UNS-Prf.s

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%------------------------------------------------------------------------------
% File     : Z3---4.15.1
% Problem  : SET132-6 : TPTP v9.0.0. Bugfixed v2.1.0.
% Transfm  : none
% Format   : tptp
% Command  : run_E %s %d THM

% Computer : n001.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  : 300s
% DateTime : Sat Jun 21 05:25:19 AM UTC 2025

% Result   : Unsatisfiable 0.20s 0.56s
% Output   : Proof 0.20s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :   20
%            Number of leaves      :   60
% Syntax   : Number of formulae    :  153 (  51 unt;   0 typ;   0 def)
%            Number of atoms       :  524 (  55 equ)
%            Maximal formula atoms :   12 (   3 avg)
%            Number of connectives :  644 ( 283   ~; 301   |;   0   &)
%                                         (  60 <=>;   0  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    9 (   5 avg)
%            Maximal term depth    :    6 (   2 avg)
%            Number of FOOLs       :   10 (  10 fml;   0 var)
%            Number of types       :    2 (   0 usr)
%            Number of type conns  :    0 (   0   >;   0   *;   0   +;   0  <<)
%            Number of predicates  :    5 (   3 usr;   1 prp; 0-2 aty)
%            Number of functors    :   11 (  11 usr;   5 con; 0-2 aty)
%            Number of variables   :  298 ( 277   !;   0   ?; 298   :)

% Comments : 
%------------------------------------------------------------------------------
tff(member_type,type,
    member: ( $i * $i ) > $o ).

tff(complement_type,type,
    complement: $i > $i ).

tff(singleton_type,type,
    singleton: $i > $i ).

tff(u_type,type,
    u: $i ).

tff(intersection_type,type,
    intersection: ( $i * $i ) > $i ).

tff(null_class_type,type,
    null_class: $i ).

tff(set_builder_type,type,
    set_builder: ( $i * $i ) > $i ).

tff(union_type,type,
    union: ( $i * $i ) > $i ).

tff(y_type,type,
    y: $i ).

tff(x_type,type,
    x: $i ).

tff(universal_class_type,type,
    universal_class: $i ).

tff(unordered_pair_type,type,
    unordered_pair: ( $i * $i ) > $i ).

tff(1,plain,
    ^ [Y: $i,X: $i] :
      refl(( ( union(singleton(X),Y) = set_builder(X,Y) )
      <=> ( union(singleton(X),Y) = set_builder(X,Y) ) )),
    inference(bind,[status(th)],[]) ).

tff(2,plain,
    ( ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) )
  <=> ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ) ),
    inference(quant_intro,[status(thm)],[1]) ).

tff(3,plain,
    ( ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) )
  <=> ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(4,axiom,
    ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ),
    file('/export/starexec/sandbox/benchmark/theBenchmark.p',definition_of_set_builder) ).

tff(5,plain,
    ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ),
    inference(modus_ponens,[status(thm)],[4,3]) ).

tff(6,plain,
    ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ),
    inference(skolemize,[status(sab)],[5]) ).

tff(7,plain,
    ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) ),
    inference(modus_ponens,[status(thm)],[6,2]) ).

tff(8,plain,
    ( ~ ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) )
    | ( union(singleton(u),null_class) = set_builder(u,null_class) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(9,plain,
    union(singleton(u),null_class) = set_builder(u,null_class),
    inference(unit_resolution,[status(thm)],[8,7]) ).

tff(10,plain,
    ^ [Y: $i,X: $i] :
      refl(( ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
      <=> ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ) )),
    inference(bind,[status(th)],[]) ).

tff(11,plain,
    ( ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
  <=> ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ) ),
    inference(quant_intro,[status(thm)],[10]) ).

tff(12,plain,
    ( ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
  <=> ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(13,axiom,
    ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',union) ).

tff(14,plain,
    ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ),
    inference(modus_ponens,[status(thm)],[13,12]) ).

tff(15,plain,
    ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ),
    inference(skolemize,[status(sab)],[14]) ).

tff(16,plain,
    ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) ),
    inference(modus_ponens,[status(thm)],[15,11]) ).

tff(17,plain,
    ( ~ ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
    | ( complement(intersection(complement(singleton(u)),complement(null_class))) = union(singleton(u),null_class) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(18,plain,
    complement(intersection(complement(singleton(u)),complement(null_class))) = union(singleton(u),null_class),
    inference(unit_resolution,[status(thm)],[17,16]) ).

tff(19,plain,
    complement(intersection(complement(singleton(u)),complement(null_class))) = set_builder(u,null_class),
    inference(transitivity,[status(thm)],[18,9]) ).

tff(20,plain,
    ( member(u,complement(intersection(complement(singleton(u)),complement(null_class))))
  <=> member(u,set_builder(u,null_class)) ),
    inference(monotonicity,[status(thm)],[19]) ).

tff(21,plain,
    ( member(u,set_builder(u,null_class))
  <=> member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ),
    inference(symmetry,[status(thm)],[20]) ).

tff(22,plain,
    ( ~ member(u,set_builder(u,null_class))
  <=> ~ member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ),
    inference(monotonicity,[status(thm)],[21]) ).

tff(23,plain,
    ( ~ ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) )
    | ( union(singleton(y),set_builder(u,null_class)) = set_builder(y,set_builder(u,null_class)) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(24,plain,
    union(singleton(y),set_builder(u,null_class)) = set_builder(y,set_builder(u,null_class)),
    inference(unit_resolution,[status(thm)],[23,7]) ).

tff(25,plain,
    ( ~ ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
    | ( complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class)))) = union(singleton(y),set_builder(u,null_class)) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(26,plain,
    complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class)))) = union(singleton(y),set_builder(u,null_class)),
    inference(unit_resolution,[status(thm)],[25,16]) ).

tff(27,plain,
    complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class)))) = set_builder(y,set_builder(u,null_class)),
    inference(transitivity,[status(thm)],[26,24]) ).

tff(28,plain,
    ( member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class)))))
  <=> member(u,set_builder(y,set_builder(u,null_class))) ),
    inference(monotonicity,[status(thm)],[27]) ).

tff(29,plain,
    ( member(u,set_builder(y,set_builder(u,null_class)))
  <=> member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ),
    inference(symmetry,[status(thm)],[28]) ).

tff(30,plain,
    ( ~ member(u,set_builder(y,set_builder(u,null_class)))
  <=> ~ member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ),
    inference(monotonicity,[status(thm)],[29]) ).

tff(31,plain,
    ( ~ ! [Y: $i,X: $i] : ( union(singleton(X),Y) = set_builder(X,Y) )
    | ( union(singleton(x),set_builder(y,set_builder(u,null_class))) = set_builder(x,set_builder(y,set_builder(u,null_class))) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(32,plain,
    union(singleton(x),set_builder(y,set_builder(u,null_class))) = set_builder(x,set_builder(y,set_builder(u,null_class))),
    inference(unit_resolution,[status(thm)],[31,7]) ).

tff(33,plain,
    ( ~ ! [Y: $i,X: $i] : ( complement(intersection(complement(X),complement(Y))) = union(X,Y) )
    | ( complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class))))) = union(singleton(x),set_builder(y,set_builder(u,null_class))) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(34,plain,
    complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class))))) = union(singleton(x),set_builder(y,set_builder(u,null_class))),
    inference(unit_resolution,[status(thm)],[33,16]) ).

tff(35,plain,
    complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class))))) = set_builder(x,set_builder(y,set_builder(u,null_class))),
    inference(transitivity,[status(thm)],[34,32]) ).

tff(36,plain,
    ( member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class))))))
  <=> member(u,set_builder(x,set_builder(y,set_builder(u,null_class)))) ),
    inference(monotonicity,[status(thm)],[35]) ).

tff(37,plain,
    ( member(u,set_builder(x,set_builder(y,set_builder(u,null_class))))
  <=> member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ),
    inference(symmetry,[status(thm)],[36]) ).

tff(38,plain,
    ( ~ member(u,set_builder(x,set_builder(y,set_builder(u,null_class))))
  <=> ~ member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ),
    inference(monotonicity,[status(thm)],[37]) ).

tff(39,plain,
    ( ~ member(u,set_builder(x,set_builder(y,set_builder(u,null_class))))
  <=> ~ member(u,set_builder(x,set_builder(y,set_builder(u,null_class)))) ),
    inference(rewrite,[status(thm)],[]) ).

tff(40,axiom,
    ~ member(u,set_builder(x,set_builder(y,set_builder(u,null_class)))),
    file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_member_of_triple3_2) ).

tff(41,plain,
    ~ member(u,set_builder(x,set_builder(y,set_builder(u,null_class)))),
    inference(modus_ponens,[status(thm)],[40,39]) ).

tff(42,plain,
    ~ member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))),
    inference(modus_ponens,[status(thm)],[41,38]) ).

tff(43,plain,
    ( member(u,universal_class)
  <=> member(u,universal_class) ),
    inference(rewrite,[status(thm)],[]) ).

tff(44,axiom,
    member(u,universal_class),
    file('/export/starexec/sandbox/benchmark/theBenchmark.p',prove_member_of_triple3_1) ).

tff(45,plain,
    member(u,universal_class),
    inference(modus_ponens,[status(thm)],[44,43]) ).

tff(46,plain,
    ^ [Z: $i,X: $i] :
      refl(( ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
      <=> ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) ) )),
    inference(bind,[status(th)],[]) ).

tff(47,plain,
    ( ! [Z: $i,X: $i] :
        ( member(Z,X)
        | ~ member(Z,universal_class)
        | member(Z,complement(X)) )
  <=> ! [Z: $i,X: $i] :
        ( member(Z,X)
        | ~ member(Z,universal_class)
        | member(Z,complement(X)) ) ),
    inference(quant_intro,[status(thm)],[46]) ).

tff(48,plain,
    ( ! [Z: $i,X: $i] :
        ( member(Z,X)
        | ~ member(Z,universal_class)
        | member(Z,complement(X)) )
  <=> ! [Z: $i,X: $i] :
        ( member(Z,X)
        | ~ member(Z,universal_class)
        | member(Z,complement(X)) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(49,plain,
    ^ [Z: $i,X: $i] :
      rewrite(( ( ~ member(Z,universal_class)
          | member(Z,complement(X))
          | member(Z,X) )
      <=> ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) ) )),
    inference(bind,[status(th)],[]) ).

tff(50,plain,
    ( ! [Z: $i,X: $i] :
        ( ~ member(Z,universal_class)
        | member(Z,complement(X))
        | member(Z,X) )
  <=> ! [Z: $i,X: $i] :
        ( member(Z,X)
        | ~ member(Z,universal_class)
        | member(Z,complement(X)) ) ),
    inference(quant_intro,[status(thm)],[49]) ).

tff(51,axiom,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,universal_class)
      | member(Z,complement(X))
      | member(Z,X) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',complement2) ).

tff(52,plain,
    ! [Z: $i,X: $i] :
      ( member(Z,X)
      | ~ member(Z,universal_class)
      | member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[51,50]) ).

tff(53,plain,
    ! [Z: $i,X: $i] :
      ( member(Z,X)
      | ~ member(Z,universal_class)
      | member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[52,48]) ).

tff(54,plain,
    ! [Z: $i,X: $i] :
      ( member(Z,X)
      | ~ member(Z,universal_class)
      | member(Z,complement(X)) ),
    inference(skolemize,[status(sab)],[53]) ).

tff(55,plain,
    ! [Z: $i,X: $i] :
      ( member(Z,X)
      | ~ member(Z,universal_class)
      | member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[54,47]) ).

tff(56,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(57,plain,
    ( ( member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) )
  <=> ( ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(58,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ) ),
    inference(monotonicity,[status(thm)],[57]) ).

tff(59,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ) ),
    inference(transitivity,[status(thm)],[58,56]) ).

tff(60,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
    | ~ member(u,universal_class)
    | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(61,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | ~ member(u,universal_class)
    | member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
    | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ),
    inference(modus_ponens,[status(thm)],[60,59]) ).

tff(62,plain,
    ( member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
    | member(u,complement(intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))) ),
    inference(unit_resolution,[status(thm)],[61,55,45]) ).

tff(63,plain,
    member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class))))),
    inference(unit_resolution,[status(thm)],[62,42]) ).

tff(64,plain,
    ^ [Z: $i,Y: $i,X: $i] :
      refl(( ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) )
      <=> ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) ) )),
    inference(bind,[status(th)],[]) ).

tff(65,plain,
    ( ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,Y) )
  <=> ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,Y) ) ),
    inference(quant_intro,[status(thm)],[64]) ).

tff(66,plain,
    ( ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,Y) )
  <=> ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,Y) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(67,axiom,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,Y) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',intersection2) ).

tff(68,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,Y) ),
    inference(modus_ponens,[status(thm)],[67,66]) ).

tff(69,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,Y) ),
    inference(skolemize,[status(sab)],[68]) ).

tff(70,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,Y) ),
    inference(modus_ponens,[status(thm)],[69,65]) ).

tff(71,plain,
    ( ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,Y) )
      | ~ member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(set_builder(y,set_builder(u,null_class)))) )
  <=> ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,Y) )
      | ~ member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
      | member(u,complement(set_builder(y,set_builder(u,null_class)))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(72,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) )
    | ~ member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
    | member(u,complement(set_builder(y,set_builder(u,null_class)))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(73,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) )
    | ~ member(u,intersection(complement(singleton(x)),complement(set_builder(y,set_builder(u,null_class)))))
    | member(u,complement(set_builder(y,set_builder(u,null_class)))) ),
    inference(modus_ponens,[status(thm)],[72,71]) ).

tff(74,plain,
    member(u,complement(set_builder(y,set_builder(u,null_class)))),
    inference(unit_resolution,[status(thm)],[73,70,63]) ).

tff(75,plain,
    ^ [Z: $i,X: $i] :
      refl(( ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
      <=> ( ~ member(Z,X)
          | ~ member(Z,complement(X)) ) )),
    inference(bind,[status(th)],[]) ).

tff(76,plain,
    ( ! [Z: $i,X: $i] :
        ( ~ member(Z,X)
        | ~ member(Z,complement(X)) )
  <=> ! [Z: $i,X: $i] :
        ( ~ member(Z,X)
        | ~ member(Z,complement(X)) ) ),
    inference(quant_intro,[status(thm)],[75]) ).

tff(77,plain,
    ( ! [Z: $i,X: $i] :
        ( ~ member(Z,X)
        | ~ member(Z,complement(X)) )
  <=> ! [Z: $i,X: $i] :
        ( ~ member(Z,X)
        | ~ member(Z,complement(X)) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(78,plain,
    ^ [Z: $i,X: $i] :
      rewrite(( ( ~ member(Z,complement(X))
          | ~ member(Z,X) )
      <=> ( ~ member(Z,X)
          | ~ member(Z,complement(X)) ) )),
    inference(bind,[status(th)],[]) ).

tff(79,plain,
    ( ! [Z: $i,X: $i] :
        ( ~ member(Z,complement(X))
        | ~ member(Z,X) )
  <=> ! [Z: $i,X: $i] :
        ( ~ member(Z,X)
        | ~ member(Z,complement(X)) ) ),
    inference(quant_intro,[status(thm)],[78]) ).

tff(80,axiom,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,complement(X))
      | ~ member(Z,X) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',complement1) ).

tff(81,plain,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,X)
      | ~ member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[80,79]) ).

tff(82,plain,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,X)
      | ~ member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[81,77]) ).

tff(83,plain,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,X)
      | ~ member(Z,complement(X)) ),
    inference(skolemize,[status(sab)],[82]) ).

tff(84,plain,
    ! [Z: $i,X: $i] :
      ( ~ member(Z,X)
      | ~ member(Z,complement(X)) ),
    inference(modus_ponens,[status(thm)],[83,76]) ).

tff(85,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,set_builder(y,set_builder(u,null_class)))
      | ~ member(u,complement(set_builder(y,set_builder(u,null_class)))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,set_builder(y,set_builder(u,null_class)))
      | ~ member(u,complement(set_builder(y,set_builder(u,null_class)))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(86,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,set_builder(y,set_builder(u,null_class)))
    | ~ member(u,complement(set_builder(y,set_builder(u,null_class)))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(87,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,set_builder(y,set_builder(u,null_class)))
    | ~ member(u,complement(set_builder(y,set_builder(u,null_class)))) ),
    inference(modus_ponens,[status(thm)],[86,85]) ).

tff(88,plain,
    ~ member(u,set_builder(y,set_builder(u,null_class))),
    inference(unit_resolution,[status(thm)],[87,84,74]) ).

tff(89,plain,
    ~ member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))),
    inference(modus_ponens,[status(thm)],[88,30]) ).

tff(90,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(91,plain,
    ( ( member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) )
  <=> ( ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(92,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ) ),
    inference(monotonicity,[status(thm)],[91]) ).

tff(93,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ) ),
    inference(transitivity,[status(thm)],[92,90]) ).

tff(94,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
    | ~ member(u,universal_class)
    | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(95,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | ~ member(u,universal_class)
    | member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
    | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ),
    inference(modus_ponens,[status(thm)],[94,93]) ).

tff(96,plain,
    ( member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
    | member(u,complement(intersection(complement(singleton(y)),complement(set_builder(u,null_class))))) ),
    inference(unit_resolution,[status(thm)],[95,55,45]) ).

tff(97,plain,
    member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class)))),
    inference(unit_resolution,[status(thm)],[96,89]) ).

tff(98,plain,
    ( ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,Y) )
      | ~ member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(set_builder(u,null_class))) )
  <=> ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,Y) )
      | ~ member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
      | member(u,complement(set_builder(u,null_class))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(99,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) )
    | ~ member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
    | member(u,complement(set_builder(u,null_class))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(100,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,Y) )
    | ~ member(u,intersection(complement(singleton(y)),complement(set_builder(u,null_class))))
    | member(u,complement(set_builder(u,null_class))) ),
    inference(modus_ponens,[status(thm)],[99,98]) ).

tff(101,plain,
    member(u,complement(set_builder(u,null_class))),
    inference(unit_resolution,[status(thm)],[100,70,97]) ).

tff(102,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,set_builder(u,null_class))
      | ~ member(u,complement(set_builder(u,null_class))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,set_builder(u,null_class))
      | ~ member(u,complement(set_builder(u,null_class))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(103,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,set_builder(u,null_class))
    | ~ member(u,complement(set_builder(u,null_class))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(104,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,set_builder(u,null_class))
    | ~ member(u,complement(set_builder(u,null_class))) ),
    inference(modus_ponens,[status(thm)],[103,102]) ).

tff(105,plain,
    ~ member(u,set_builder(u,null_class)),
    inference(unit_resolution,[status(thm)],[104,84,101]) ).

tff(106,plain,
    ~ member(u,complement(intersection(complement(singleton(u)),complement(null_class)))),
    inference(modus_ponens,[status(thm)],[105,22]) ).

tff(107,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(108,plain,
    ( ( member(u,intersection(complement(singleton(u)),complement(null_class)))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) )
  <=> ( ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(109,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ) ),
    inference(monotonicity,[status(thm)],[108]) ).

tff(110,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | ~ member(u,universal_class)
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( member(Z,X)
            | ~ member(Z,universal_class)
            | member(Z,complement(X)) )
      | ~ member(u,universal_class)
      | member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ) ),
    inference(transitivity,[status(thm)],[109,107]) ).

tff(111,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | member(u,intersection(complement(singleton(u)),complement(null_class)))
    | ~ member(u,universal_class)
    | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(112,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( member(Z,X)
          | ~ member(Z,universal_class)
          | member(Z,complement(X)) )
    | ~ member(u,universal_class)
    | member(u,intersection(complement(singleton(u)),complement(null_class)))
    | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ),
    inference(modus_ponens,[status(thm)],[111,110]) ).

tff(113,plain,
    ( member(u,intersection(complement(singleton(u)),complement(null_class)))
    | member(u,complement(intersection(complement(singleton(u)),complement(null_class)))) ),
    inference(unit_resolution,[status(thm)],[112,55,45]) ).

tff(114,plain,
    member(u,intersection(complement(singleton(u)),complement(null_class))),
    inference(unit_resolution,[status(thm)],[113,106]) ).

tff(115,plain,
    ^ [Z: $i,Y: $i,X: $i] :
      refl(( ( ~ member(Z,intersection(X,Y))
          | member(Z,X) )
      <=> ( ~ member(Z,intersection(X,Y))
          | member(Z,X) ) )),
    inference(bind,[status(th)],[]) ).

tff(116,plain,
    ( ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,X) )
  <=> ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,X) ) ),
    inference(quant_intro,[status(thm)],[115]) ).

tff(117,plain,
    ( ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,X) )
  <=> ! [Z: $i,Y: $i,X: $i] :
        ( ~ member(Z,intersection(X,Y))
        | member(Z,X) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(118,axiom,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,X) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',intersection1) ).

tff(119,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,X) ),
    inference(modus_ponens,[status(thm)],[118,117]) ).

tff(120,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,X) ),
    inference(skolemize,[status(sab)],[119]) ).

tff(121,plain,
    ! [Z: $i,Y: $i,X: $i] :
      ( ~ member(Z,intersection(X,Y))
      | member(Z,X) ),
    inference(modus_ponens,[status(thm)],[120,116]) ).

tff(122,plain,
    ( ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,X) )
      | ~ member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(singleton(u))) )
  <=> ( ~ ! [Z: $i,Y: $i,X: $i] :
            ( ~ member(Z,intersection(X,Y))
            | member(Z,X) )
      | ~ member(u,intersection(complement(singleton(u)),complement(null_class)))
      | member(u,complement(singleton(u))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(123,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,X) )
    | ~ member(u,intersection(complement(singleton(u)),complement(null_class)))
    | member(u,complement(singleton(u))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(124,plain,
    ( ~ ! [Z: $i,Y: $i,X: $i] :
          ( ~ member(Z,intersection(X,Y))
          | member(Z,X) )
    | ~ member(u,intersection(complement(singleton(u)),complement(null_class)))
    | member(u,complement(singleton(u))) ),
    inference(modus_ponens,[status(thm)],[123,122]) ).

tff(125,plain,
    member(u,complement(singleton(u))),
    inference(unit_resolution,[status(thm)],[124,121,114]) ).

tff(126,plain,
    ^ [X: $i] :
      refl(( ( unordered_pair(X,X) = singleton(X) )
      <=> ( unordered_pair(X,X) = singleton(X) ) )),
    inference(bind,[status(th)],[]) ).

tff(127,plain,
    ( ! [X: $i] : ( unordered_pair(X,X) = singleton(X) )
  <=> ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ) ),
    inference(quant_intro,[status(thm)],[126]) ).

tff(128,plain,
    ( ! [X: $i] : ( unordered_pair(X,X) = singleton(X) )
  <=> ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(129,axiom,
    ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',singleton_set) ).

tff(130,plain,
    ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ),
    inference(modus_ponens,[status(thm)],[129,128]) ).

tff(131,plain,
    ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ),
    inference(skolemize,[status(sab)],[130]) ).

tff(132,plain,
    ! [X: $i] : ( unordered_pair(X,X) = singleton(X) ),
    inference(modus_ponens,[status(thm)],[131,127]) ).

tff(133,plain,
    ( ~ ! [X: $i] : ( unordered_pair(X,X) = singleton(X) )
    | ( unordered_pair(u,u) = singleton(u) ) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(134,plain,
    unordered_pair(u,u) = singleton(u),
    inference(unit_resolution,[status(thm)],[133,132]) ).

tff(135,plain,
    singleton(u) = unordered_pair(u,u),
    inference(symmetry,[status(thm)],[134]) ).

tff(136,plain,
    ( member(u,singleton(u))
  <=> member(u,unordered_pair(u,u)) ),
    inference(monotonicity,[status(thm)],[135]) ).

tff(137,plain,
    ( member(u,unordered_pair(u,u))
  <=> member(u,singleton(u)) ),
    inference(symmetry,[status(thm)],[136]) ).

tff(138,plain,
    ^ [Y: $i,X: $i] :
      refl(( ( ~ member(X,universal_class)
          | member(X,unordered_pair(X,Y)) )
      <=> ( ~ member(X,universal_class)
          | member(X,unordered_pair(X,Y)) ) )),
    inference(bind,[status(th)],[]) ).

tff(139,plain,
    ( ! [Y: $i,X: $i] :
        ( ~ member(X,universal_class)
        | member(X,unordered_pair(X,Y)) )
  <=> ! [Y: $i,X: $i] :
        ( ~ member(X,universal_class)
        | member(X,unordered_pair(X,Y)) ) ),
    inference(quant_intro,[status(thm)],[138]) ).

tff(140,plain,
    ( ! [Y: $i,X: $i] :
        ( ~ member(X,universal_class)
        | member(X,unordered_pair(X,Y)) )
  <=> ! [Y: $i,X: $i] :
        ( ~ member(X,universal_class)
        | member(X,unordered_pair(X,Y)) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(141,axiom,
    ! [Y: $i,X: $i] :
      ( ~ member(X,universal_class)
      | member(X,unordered_pair(X,Y)) ),
    file('/export/starexec/sandbox/benchmark/Axioms/SET004-0.ax',unordered_pair2) ).

tff(142,plain,
    ! [Y: $i,X: $i] :
      ( ~ member(X,universal_class)
      | member(X,unordered_pair(X,Y)) ),
    inference(modus_ponens,[status(thm)],[141,140]) ).

tff(143,plain,
    ! [Y: $i,X: $i] :
      ( ~ member(X,universal_class)
      | member(X,unordered_pair(X,Y)) ),
    inference(skolemize,[status(sab)],[142]) ).

tff(144,plain,
    ! [Y: $i,X: $i] :
      ( ~ member(X,universal_class)
      | member(X,unordered_pair(X,Y)) ),
    inference(modus_ponens,[status(thm)],[143,139]) ).

tff(145,plain,
    ( ( ~ ! [Y: $i,X: $i] :
            ( ~ member(X,universal_class)
            | member(X,unordered_pair(X,Y)) )
      | ~ member(u,universal_class)
      | member(u,unordered_pair(u,u)) )
  <=> ( ~ ! [Y: $i,X: $i] :
            ( ~ member(X,universal_class)
            | member(X,unordered_pair(X,Y)) )
      | ~ member(u,universal_class)
      | member(u,unordered_pair(u,u)) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(146,plain,
    ( ~ ! [Y: $i,X: $i] :
          ( ~ member(X,universal_class)
          | member(X,unordered_pair(X,Y)) )
    | ~ member(u,universal_class)
    | member(u,unordered_pair(u,u)) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(147,plain,
    ( ~ ! [Y: $i,X: $i] :
          ( ~ member(X,universal_class)
          | member(X,unordered_pair(X,Y)) )
    | ~ member(u,universal_class)
    | member(u,unordered_pair(u,u)) ),
    inference(modus_ponens,[status(thm)],[146,145]) ).

tff(148,plain,
    member(u,unordered_pair(u,u)),
    inference(unit_resolution,[status(thm)],[147,144,45]) ).

tff(149,plain,
    member(u,singleton(u)),
    inference(modus_ponens,[status(thm)],[148,137]) ).

tff(150,plain,
    ( ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,singleton(u))
      | ~ member(u,complement(singleton(u))) )
  <=> ( ~ ! [Z: $i,X: $i] :
            ( ~ member(Z,X)
            | ~ member(Z,complement(X)) )
      | ~ member(u,singleton(u))
      | ~ member(u,complement(singleton(u))) ) ),
    inference(rewrite,[status(thm)],[]) ).

tff(151,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,singleton(u))
    | ~ member(u,complement(singleton(u))) ),
    inference(quant_inst,[status(thm)],[]) ).

tff(152,plain,
    ( ~ ! [Z: $i,X: $i] :
          ( ~ member(Z,X)
          | ~ member(Z,complement(X)) )
    | ~ member(u,singleton(u))
    | ~ member(u,complement(singleton(u))) ),
    inference(modus_ponens,[status(thm)],[151,150]) ).

tff(153,plain,
    $false,
    inference(unit_resolution,[status(thm)],[152,84,149,125]) ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.11/0.12  % Problem    : SET132-6 : TPTP v9.0.0. Bugfixed v2.1.0.
% 0.11/0.12  % Command    : run_E %s %d THM
% 0.12/0.34  % Computer : n001.cluster.edu
% 0.12/0.34  % Model    : x86_64 x86_64
% 0.12/0.34  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.34  % Memory   : 8042.1875MB
% 0.12/0.34  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.34  % CPULimit   : 300
% 0.12/0.34  % WCLimit    : 300
% 0.12/0.34  % DateTime   : Fri Jun 20 04:27:19 EDT 2025
% 0.12/0.34  % CPUTime    : 
% 0.20/0.56  % SZS status Unsatisfiable
% 0.20/0.56  % SZS output start Proof
% See solution above
% 0.20/0.58  % E exiting
%------------------------------------------------------------------------------