## TPTP Problem File: PUZ123^5.p

View Solutions - Solve Problem

```%------------------------------------------------------------------------------
% File     : PUZ123^5 : TPTP v7.2.0. Bugfixed v5.2.0.
% Domain   : Puzzles
% Problem  : TPS problem from CHECKERBOARD-THMS
% Version  : Especial.
% English  :

% Refs     : [Bro09] Brown (2009), Email to Geoff Sutcliffe
% Source   : [Bro09]
% Names    : tps_0846 [Bro09]

% Status   : CounterSatisfiable
% Rating   : 0.50 v7.2.0, 0.33 v6.4.0, 0.67 v6.3.0, 0.33 v5.2.0
% Syntax   : Number of formulae    :    6 (   0 unit;   4 type;   1 defn)
%            Number of atoms       :   42 (   5 equality;  19 variable)
%            Maximal formula depth :   15 (   6 average)
%            Number of connectives :   31 (   1   ~;   1   |;   4   &;  22   @)
%                                         (   0 <=>;   3  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of type conns  :    5 (   5   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :    6 (   4   :;   0   =)
%            Number of variables   :    7 (   0 sgn;   5   !;   0   ?;   2   ^)
%                                         (   7   :;   0  !>;   0  ?*)
%                                         (   0  @-;   0  @+)
% SPC      : TH0_CSA_EQU_NAR

% Comments : This problem is from the TPS library. Copyright (c) 2009 The TPS
%            project in the Department of Mathematical Sciences at Carnegie
% Bugfixes : v5.2.0 - Added missing type declarations.
%------------------------------------------------------------------------------
thf(c1_type,type,(
c1: \$i )).

thf(c8_type,type,(
c8: \$i )).

thf(s_type,type,(
s: \$i > \$i )).

thf(cCKB6_BLACK_type,type,(
cCKB6_BLACK: \$i > \$i > \$o )).

thf(cCKB6_BLACK_def,definition,
( cCKB6_BLACK
= ( ^ [Xu: \$i,Xv: \$i] :
! [Xw: \$i > \$i > \$o] :
( ( ( Xw @ c1 @ c1 )
& ! [Xj: \$i,Xk: \$i] :
( ( Xw @ Xj @ Xk )
=> ( ( Xw @ ( s @ ( s @ Xj ) ) @ Xk )
& ( Xw @ ( s @ Xj ) @ ( s @ Xk ) ) ) ) )
=> ( Xw @ Xu @ Xv ) ) ) )).

thf(cCKB_L39000,conjecture,(
! [Xx: \$i,Xy: \$i] :
( ( cCKB6_BLACK @ Xx @ Xy )
=> ~ ( ( ( ( s @ ( s @ Xx ) )
= c1 )
& ( ( s @ Xy )
= c1 ) )
| ( ( ( s @ ( s @ Xx ) )
= c8 )
& ( ( s @ Xy )
= c8 ) ) ) ) )).

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