%------------------------------------------------------------------------------
% File     : SEU999^5 : TPTP v9.0.0. Released v4.0.0.
% Domain   : Set Theory (Relations)
% Problem  : TPS problem PENTAGON-THM2B
% Version  : Especial.
% English  :

% Refs     : [Bro09] Brown (2009), Email to Geoff Sutcliffe
% Source   : [Bro09]
% Names    : tps_0561 [Bro09]
%          : PENTAGON-THM2B [TPS]

% Status   : Theorem
% Rating   : 0.25 v9.0.0, 0.30 v8.2.0, 0.23 v8.1.0, 0.09 v7.5.0, 0.14 v7.4.0, 0.22 v7.2.0, 0.12 v7.1.0, 0.38 v7.0.0, 0.43 v6.4.0, 0.50 v6.3.0, 0.60 v6.2.0, 0.57 v6.1.0, 0.43 v5.5.0, 0.67 v5.4.0, 0.80 v5.2.0, 1.00 v5.0.0, 0.60 v4.1.0, 0.67 v4.0.0
% Syntax   : Number of formulae    :    2 (   0 unt;   1 typ;   0 def)
%            Number of atoms       :   39 (  39 equ;   0 cnn)
%            Maximal formula atoms :   39 (  39 avg)
%            Number of connectives :  137 (  11   ~;   0   |;  36   &;  88   @)
%                                         (   0 <=>;   2  =>;   0  <=;   0 <~>)
%            Maximal formula depth :   39 (  39 avg)
%            Number of types       :    1 (   1 usr)
%            Number of type conns  :    4 (   4   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :    1 (   0 usr;   0 con; 2-2 aty)
%            Number of variables   :   26 (   0   ^;  21   !;   5   ?;  26   :)
% SPC      : TH0_THM_EQU_NAR

% Comments : This problem is from the TPS library. Copyright (c) 2009 The TPS
%            project in the Department of Mathematical Sciences at Carnegie
%            Mellon University. Distributed under the Creative Commons copyleft
%            license: http://creativecommons.org/licenses/by-sa/3.0/
%          : Polymorphic definitions expanded.
%------------------------------------------------------------------------------
thf(a_type,type,
    a: $tType ).

thf(cPENTAGON_THM2B_pme,conjecture,
    ! [JOIN: a > a > a,MEET: a > a > a] :
      ( ( ! [Xx: a] :
            ( ( JOIN @ Xx @ Xx )
            = Xx )
        & ! [Xx: a] :
            ( ( MEET @ Xx @ Xx )
            = Xx )
        & ! [Xx: a,Xy: a,Xz: a] :
            ( ( JOIN @ ( JOIN @ Xx @ Xy ) @ Xz )
            = ( JOIN @ Xx @ ( JOIN @ Xy @ Xz ) ) )
        & ! [Xx: a,Xy: a,Xz: a] :
            ( ( MEET @ ( MEET @ Xx @ Xy ) @ Xz )
            = ( MEET @ Xx @ ( MEET @ Xy @ Xz ) ) )
        & ! [Xx: a,Xy: a] :
            ( ( JOIN @ Xx @ Xy )
            = ( JOIN @ Xy @ Xx ) )
        & ! [Xx: a,Xy: a] :
            ( ( MEET @ Xx @ Xy )
            = ( MEET @ Xy @ Xx ) )
        & ! [Xx: a,Xy: a] :
            ( ( JOIN @ ( MEET @ Xx @ Xy ) @ Xy )
            = Xy )
        & ! [Xx: a,Xy: a] :
            ( ( MEET @ ( JOIN @ Xx @ Xy ) @ Xy )
            = Xy ) )
     => ( ? [Xx: a,Xy: a,Xa: a,Xb: a,Xc: a] :
            ( ( Xa != Xb )
            & ( Xa != Xc )
            & ( Xa != Xx )
            & ( Xa != Xy )
            & ( Xb != Xc )
            & ( Xb != Xx )
            & ( Xb != Xy )
            & ( Xc != Xx )
            & ( Xc != Xy )
            & ( Xx != Xy )
            & ( ( MEET @ Xx @ Xy )
              = Xy )
            & ( ( JOIN @ Xx @ Xy )
              = Xx )
            & ( ( MEET @ Xx @ Xa )
              = Xa )
            & ( ( JOIN @ Xx @ Xa )
              = Xx )
            & ( ( MEET @ Xx @ Xb )
              = Xb )
            & ( ( JOIN @ Xx @ Xb )
              = Xx )
            & ( ( MEET @ Xx @ Xc )
              = Xc )
            & ( ( JOIN @ Xx @ Xc )
              = Xx )
            & ( ( MEET @ Xa @ Xb )
              = Xy )
            & ( ( JOIN @ Xa @ Xb )
              = Xx )
            & ( ( MEET @ Xa @ Xc )
              = Xa )
            & ( ( JOIN @ Xa @ Xc )
              = Xc )
            & ( ( MEET @ Xa @ Xy )
              = Xy )
            & ( ( JOIN @ Xa @ Xy )
              = Xa )
            & ( ( MEET @ Xb @ Xc )
              = Xy )
            & ( ( JOIN @ Xb @ Xc )
              = Xx )
            & ( ( MEET @ Xb @ Xy )
              = Xy )
            & ( ( JOIN @ Xb @ Xy )
              = Xb )
            & ( ( MEET @ Xc @ Xy )
              = Xy )
            & ( ( JOIN @ Xc @ Xy )
              = Xc ) )
       => ~ ! [Xx: a,Xy: a,Xz: a] :
              ( ( JOIN @ Xx @ ( MEET @ Xy @ ( JOIN @ Xx @ Xz ) ) )
              = ( MEET @ ( JOIN @ Xx @ Xy ) @ ( JOIN @ Xx @ Xz ) ) ) ) ) ).

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