%------------------------------------------------------------------------------
% File     : SYO295^5 : TPTP v9.0.0. Released v4.0.0.
% Domain   : Syntactic
% Problem  : TPS problem from BASIC-HO-THMS
% Version  : Especial.
% English  :

% Refs     : [Bro09] Brown (2009), Email to Geoff Sutcliffe
% Source   : [Bro09]
% Names    : tps_0728 [Bro09]

% Status   : Theorem
% Rating   : 0.75 v9.0.0, 0.80 v8.2.0, 0.77 v8.1.0, 0.82 v7.5.0, 0.86 v7.4.0, 0.89 v7.3.0, 1.00 v4.0.0
% Syntax   : Number of formulae    :    5 (   0 unt;   4 typ;   0 def)
%            Number of atoms       :    3 (   3 equ;   0 cnn)
%            Maximal formula atoms :    3 (   3 avg)
%            Number of connectives :    5 (   1   ~;   0   |;   1   &;   2   @)
%                                         (   0 <=>;   1  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    4 (   4 avg)
%            Number of types       :    1 (   0 usr)
%            Number of type conns  :    1 (   1   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :    5 (   4 usr;   4 con; 0-2 aty)
%            Number of variables   :    1 (   0   ^;   0   !;   1   ?;   1   :)
% 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/
%------------------------------------------------------------------------------
thf(b,type,
    b: $i ).

thf(y,type,
    y: $i ).

thf(a,type,
    a: $i ).

thf(x,type,
    x: $i ).

thf(cX5311,conjecture,
    ( ( x != y )
   => ? [Xf: $i > $i] :
        ( ( ( Xf @ x )
          = a )
        & ( ( Xf @ y )
          = b ) ) ) ).

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