## TPTP Problem File: SEV306^5.p

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```%------------------------------------------------------------------------------
% File     : SEV306^5 : TPTP v7.5.0. Released v4.0.0.
% Domain   : Set Theory
% Problem  : TPS problem THM2F
% Version  : Especial.
% English  : Related to the Knaster-Tarski theorem.

% Refs     : [Bro09] Brown (2009), Email to Geoff Sutcliffe
% Source   : [Bro09]
% Names    : tps_0297 [Bro09]
%          : THM2F [TPS]

% Status   : Theorem
% Rating   : 1.00 v6.2.0, 0.86 v5.5.0, 0.83 v5.4.0, 0.80 v4.1.0, 0.67 v4.0.0
% Syntax   : Number of formulae    :    2 (   0 unit;   1 type;   0 defn)
%            Number of atoms       :   14 (   1 equality;  10 variable)
%            Maximal formula depth :    9 (   6 average)
%            Number of connectives :   11 (   0   ~;   0   |;   0   &;   7   @)
%                                         (   0 <=>;   4  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of type conns  :    6 (   6   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :    3 (   1   :;   0   =)
%            Number of variables   :    5 (   0 sgn;   4   !;   1   ?;   0   ^)
%                                         (   5   :;   0  !>;   0  ?*)
%                                         (   0  @-;   0  @+)
% 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
%          : Polymorphic definitions expanded.
%------------------------------------------------------------------------------
thf(cK,type,(
cK: ( \$i > \$o ) > \$i > \$o )).

thf(cTHM2F_pme,conjecture,
( ! [X: \$i > \$o,Y: \$i > \$o] :
( ! [Xx: \$i] :
( ( X @ Xx )
=> ( Y @ Xx ) )
=> ! [Xx: \$i] :
( ( cK @ X @ Xx )
=> ( cK @ Y @ Xx ) ) )
=> ? [U: \$i > \$o] :
( ( cK @ U )
= U ) )).

%------------------------------------------------------------------------------
```