## TPTP Problem File: KLE111+1.p

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```%------------------------------------------------------------------------------
% File     : KLE111+1 : TPTP v7.5.0. Released v4.0.0.
% Domain   : Kleene Algebra (Modal Semirings)
% Problem  : Backward diamonds and forward boxes satisfy a cancellation law
% Version  : [Hoe08] axioms.
% English  :

% Refs     : [DMS04] Desharnais et al. (2004), Termination in Modal Kleene
%          : [Hoe08] Hoefner (2008), Email to G. Sutcliffe
% Source   : [Hoe08]
% Names    :

% Status   : Theorem
% Rating   : 0.83 v7.5.0, 0.84 v7.4.0, 0.83 v7.2.0, 0.86 v7.1.0, 0.78 v7.0.0, 0.83 v6.4.0, 0.81 v6.3.0, 0.79 v6.2.0, 0.84 v6.1.0, 0.93 v6.0.0, 0.87 v5.5.0, 0.93 v5.2.0, 0.90 v5.0.0, 0.92 v4.1.0, 0.91 v4.0.1, 0.87 v4.0.0
% Syntax   : Number of formulae    :   27 (  26 unit)
%            Number of atoms       :   28 (  27 equality)
%            Maximal formula depth :    4 (   3 average)
%            Number of connectives :    1 (   0   ~;   0   |;   0   &)
%                                         (   1 <=>;   0  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of predicates  :    2 (   0 propositional; 2-2 arity)
%            Number of functors    :   14 (   2 constant; 0-2 arity)
%            Number of variables   :   45 (   0 sgn;  45   !;   0   ?)
%            Maximal term depth    :    6 (   3 average)
% SPC      : FOF_THM_RFO_SEQ