%------------------------------------------------------------------------------
% File     : Metis---2.4
% Problem  : SET062-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : metis --show proof --show saturation %s

% Computer : n007.cluster.edu
% Model    : x86_64 x86_64
% CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory   : 8042.1875MB
% OS       : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit  : 600s
% DateTime : Tue Jul 19 03:32:01 EDT 2022

% Result   : Unsatisfiable 1.97s 2.14s
% Output   : CNFRefutation 1.97s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :    4
%            Number of leaves      :    3
% Syntax   : Number of clauses     :    8 (   6 unt;   2 nHn;   5 RR)
%            Number of literals    :   10 (   0 equ;   3 neg)
%            Maximal clause size   :    2 (   1 avg)
%            Maximal term depth    :    2 (   1 avg)
%            Number of predicates  :    3 (   2 usr;   1 prp; 0-2 aty)
%            Number of functors    :    3 (   3 usr;   2 con; 0-2 aty)
%            Number of variables   :    6 (   3 sgn)

% Comments : 
%------------------------------------------------------------------------------
cnf(not_subclass_members1,axiom,
    ( member(not_subclass_element(X,Y),X)
    | subclass(X,Y) ) ).

cnf(existence_of_null_class,axiom,
    ~ member(Z,null_class) ).

cnf(prove_null_class_is_subclass_1,negated_conjecture,
    ~ subclass(null_class,x) ).

cnf(refute_0_0,plain,
    ~ member(not_subclass_element(null_class,X_309),null_class),
    inference(subst,[],[existence_of_null_class:[bind(Z,$fot(not_subclass_element(null_class,X_309)))]]) ).

cnf(refute_0_1,plain,
    ( member(not_subclass_element(null_class,X_309),null_class)
    | subclass(null_class,X_309) ),
    inference(subst,[],[not_subclass_members1:[bind(X,$fot(null_class)),bind(Y,$fot(X_309))]]) ).

cnf(refute_0_2,plain,
    subclass(null_class,X_309),
    inference(resolve,[$cnf( member(not_subclass_element(null_class,X_309),null_class) )],[refute_0_1,refute_0_0]) ).

cnf(refute_0_3,plain,
    subclass(null_class,x),
    inference(subst,[],[refute_0_2:[bind(X_309,$fot(x))]]) ).

cnf(refute_0_4,plain,
    $false,
    inference(resolve,[$cnf( subclass(null_class,x) )],[refute_0_3,prove_null_class_is_subclass_1]) ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.12  % Problem  : SET062-7 : TPTP v8.1.0. Bugfixed v2.1.0.
% 0.12/0.13  % Command  : metis --show proof --show saturation %s
% 0.12/0.34  % Computer : n007.cluster.edu
% 0.12/0.34  % Model    : x86_64 x86_64
% 0.12/0.34  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.34  % Memory   : 8042.1875MB
% 0.12/0.34  % OS       : Linux 3.10.0-693.el7.x86_64
% 0.12/0.34  % CPULimit : 300
% 0.12/0.34  % WCLimit  : 600
% 0.12/0.34  % DateTime : Sat Jul  9 18:01:31 EDT 2022
% 0.12/0.35  % CPUTime  : 
% 0.12/0.35  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 1.97/2.14  % SZS status Unsatisfiable for /export/starexec/sandbox/benchmark/theBenchmark.p
% 1.97/2.14  
% 1.97/2.14  % SZS output start CNFRefutation for /export/starexec/sandbox/benchmark/theBenchmark.p
% See solution above
% 1.97/2.14  
%------------------------------------------------------------------------------