%------------------------------------------------------------------------------
% File     : LAT177-1 : TPTP v8.2.0. Released v3.1.0.
% Domain   : Lattice Theory
% Problem  : Huntington equation H79_dual implies H6
% Version  : [McC05] (equality) axioms : Especial.
% English  :

% Refs     : [McC05] McCune (2005), Email to Geoff Sutcliffe
% Source   : [McC05]
% Names    :

% Status   : Unsatisfiable
% Rating   : 0.77 v8.2.0, 0.83 v8.1.0, 0.85 v7.5.0, 0.88 v7.4.0, 0.87 v7.3.0, 0.84 v7.1.0, 0.83 v7.0.0, 0.84 v6.3.0, 0.88 v6.2.0, 0.93 v6.1.0, 0.94 v6.0.0, 0.95 v5.4.0, 1.00 v3.1.0
% Syntax   : Number of clauses     :   10 (  10 unt;   0 nHn;   1 RR)
%            Number of literals    :   10 (  10 equ;   1 neg)
%            Maximal clause size   :    1 (   1 avg)
%            Maximal term depth    :    6 (   2 avg)
%            Number of predicates  :    1 (   0 usr;   0 prp; 2-2 aty)
%            Number of functors    :    5 (   5 usr;   3 con; 0-2 aty)
%            Number of variables   :   20 (   2 sgn)
% SPC      : CNF_UNS_RFO_PEQ_UEQ

% Comments :
%------------------------------------------------------------------------------
%----Include Lattice theory (equality) axioms
include('Axioms/LAT001-0.ax').
%------------------------------------------------------------------------------
cnf(equation_H79_dual,axiom,
    join(X,meet(Y,join(Z,meet(X,U)))) = join(X,meet(join(X,meet(Y,join(X,Z))),join(Z,U))) ).

cnf(prove_H6,negated_conjecture,
    meet(a,join(b,meet(a,c))) != meet(a,join(meet(a,join(b,meet(a,c))),meet(c,join(a,b)))) ).

%------------------------------------------------------------------------------