## TPTP Problem File: KLE170+1.004.p

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```%------------------------------------------------------------------------------
% File     : KLE170+1.004 : TPTP v8.2.0. Released v5.2.0.
% Domain   : Kleene Algebra (Regular Expressions)
% Problem  : a^N <= a*, N=4
% Version  : [Hoe08] axioms.
% English  :

% Refs     : [Hoe08] Hoefner (2008), Email to G. Sutcliffe
% Source   : [TPTP]
% Names    :

% Status   : Theorem
% Rating   : 0.53 v8.2.0, 0.50 v8.1.0, 0.44 v7.5.0, 0.53 v7.4.0, 0.40 v7.3.0, 0.41 v7.2.0, 0.45 v7.1.0, 0.39 v7.0.0, 0.57 v6.4.0, 0.54 v6.3.0, 0.50 v6.2.0, 0.60 v6.1.0, 0.70 v6.0.0, 0.65 v5.5.0, 0.74 v5.4.0, 0.75 v5.3.0, 0.81 v5.2.0
% Syntax   : Number of formulae    :   17 (  14 unt;   0 def)
%            Number of atoms       :   20 (  12 equ)
%            Maximal formula atoms :    2 (   1 avg)
%            Number of connectives :    3 (   0   ~;   0   |;   0   &)
%                                         (   1 <=>;   2  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    5 (   3 avg)
%            Maximal term depth    :    4 (   2 avg)
%            Number of predicates  :    2 (   1 usr;   0 prp; 2-2 aty)
%            Number of functors    :    6 (   6 usr;   3 con; 0-2 aty)
%            Number of variables   :   30 (  30   !;   0   ?)
% SPC      : FOF_THM_RFO_SEQ