## TPTP Problem File: KLE064+1.p

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```%------------------------------------------------------------------------------
% File     : KLE064+1 : TPTP v7.5.0. Released v4.0.0.
% Domain   : Kleene Algebra (Domain Semirings)
% Problem  : Domain elements are least left preservers
% Version  : [Hoe08] axioms.
% English  :

% Refs     : [DS08]  Desharnais & Struth (2008), Modal Semirings Revisited
%          : [Hoe08] Hoefner (2008), Email to G. Sutcliffe
% Source   : [Hoe08]
% Names    :

% Status   : Theorem
% Rating   : 0.31 v7.5.0, 0.41 v7.4.0, 0.17 v7.3.0, 0.31 v7.2.0, 0.34 v7.1.0, 0.30 v6.4.0, 0.38 v6.2.0, 0.40 v6.1.0, 0.43 v5.5.0, 0.56 v5.4.0, 0.61 v5.3.0, 0.63 v5.2.0, 0.50 v5.1.0, 0.57 v5.0.0, 0.50 v4.1.0, 0.52 v4.0.1, 0.48 v4.0.0
% Syntax   : Number of formulae    :   18 (  16 unit)
%            Number of atoms       :   20 (  19 equality)
%            Maximal formula depth :    4 (   3 average)
%            Number of connectives :    2 (   0   ~;   0   |;   0   &)
%                                         (   1 <=>;   0  =>;   1  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of predicates  :    2 (   0 propositional; 2-2 arity)
%            Number of functors    :    5 (   2 constant; 0-2 arity)
%            Number of variables   :   30 (   0 sgn;  30   !;   0   ?)
%            Maximal term depth    :    4 (   2 average)
% SPC      : FOF_THM_RFO_SEQ