%--------------------------------------------------------------------------
% File     : LCL004-1 : TPTP v9.0.0. Released v2.3.0.
% Domain   : Logic Calculi (Propositional)
% Axioms   : Propositional logic deduction axioms for AND
% Version  : [WR27] axioms.
% English  :

% Refs     : [WR27]  Whitehead & Russell (1927), Principia Mathematica
% Source   : [WR27]
% Names    :

% Status   : Satisfiable
% Syntax   : Number of clauses     :    1 (   1 unt;   0 nHn;   0 RR)
%            Number of literals    :    1 (   1 equ;   0 neg)
%            Maximal clause size   :    1 (   1 avg)
%            Maximal term depth    :    4 (   2 avg)
%            Number of predicates  :    1 (   0 usr;   0 prp; 2-2 aty)
%            Number of functors    :    3 (   3 usr;   0 con; 1-2 aty)
%            Number of variables   :    2 (   0 sgn)
% SPC      : 

% Comments : Requires LCL004-0.ax
%--------------------------------------------------------------------------
cnf(and_defn,axiom,
    and(P,Q) = not(or(not(P),not(Q))) ).

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