%--------------------------------------------------------------------------
% File     : SYN391+1 : TPTP v8.2.0. Released v2.0.0.
% Domain   : Syntactic
% Problem  : Pelletier 9
% Version  : Especial.
%            Theorem formulation : 2 propositions.
% English  :

% Refs     : [Pel86] Pelletier (1986), Seventy-five Problems for Testing Au
%          : [Hah94] Haehnle (1994), Email to G. Sutcliffe
% Source   : [Hah94]
% Names    : Pelletier 9 [Pel86]

% Status   : Theorem
% Rating   : 0.00 v2.1.0
% Syntax   : Number of formulae    :    1 (   0 unt;   0 def)
%            Number of atoms       :    8 (   0 equ)
%            Maximal formula atoms :    8 (   8 avg)
%            Number of connectives :   12 (   5   ~;   4   |;   2   &)
%                                         (   0 <=>;   1  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    6 (   6 avg)
%            Maximal term depth    :    0 (   0 avg)
%            Number of predicates  :    2 (   2 usr;   2 prp; 0-0 aty)
%            Number of functors    :    0 (   0 usr;   0 con; --- aty)
%            Number of variables   :    0 (   0   !;   0   ?)
% SPC      : FOF_THM_PRP

% Comments :
%--------------------------------------------------------------------------
fof(pel9,conjecture,
    ( ( ( p1
        | p2 )
      & ( ~ p1
        | p2 )
      & ( p1
        | ~ p2 ) )
   => ~ ( ~ p1
        | ~ p2 ) ) ).

%--------------------------------------------------------------------------