## TPTP Problem File: SYN041-1.p

View Solutions - Solve Problem

```%--------------------------------------------------------------------------
% File     : SYN041-1 : TPTP v8.1.0. Released v1.0.0.
% Domain   : Syntactic
% Problem  : Pelletier Problem 3, 16
% Version  : Especial.
% English  : 3: The hardest theorm proved by a breadth-first logic
%               theorist.
%            16:A surprising theorem of propositional logic.

% Refs     : [SRM73] Siklossy et al. (1973), Breadth First Search: Some Sur
%          : [Pel86] Pelletier (1986), Seventy-five Problems for Testing Au
% Source   : [Pel86]
% Names    : Pelletier 3 [Pel86]
%          : Pelletier 16 [Pel86]

% Status   : Unsatisfiable
% Rating   : 0.00 v2.0.0
% Syntax   : Number of clauses     :    4 (   4 unt;   0 nHn;   4 RR)
%            Number of literals    :    4 (   0 equ;   2 neg)
%            Maximal clause size   :    1 (   1 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 sgn)
% SPC      : CNF_UNS_PRP

%--------------------------------------------------------------------------
cnf(clause_1,negated_conjecture,
p ).

cnf(clause_2,negated_conjecture,
~ q ).

cnf(clause_3,negated_conjecture,
q ).

cnf(clause_4,negated_conjecture,
~ p ).

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