## TPTP Problem File: SEV515+1.p

View Solutions - Solve Problem

```%------------------------------------------------------------------------------
% File     : SEV515+1 : TPTP v7.5.0. Released v7.0.0.
% Domain   : Set Theory
% Problem  : The conclusion of Russell's paradox
% Version  : Especial.
% English  :

% Refs     : [Pel16] Pelletier (2016), Email to Geoff Sutcliffe
%          : [PSH17] Pelletier et al. (2017), Automated Reasoning for the D
% Source   : [Pel16]
% Names    : 15 [PSH17]
%          : n01.p [Pel16]

% Status   : Theorem
% Rating   : 0.00 v7.0.0
% Syntax   : Number of formulae    :    5 (   0 unit)
%            Number of atoms       :   36 (   0 equality)
%            Maximal formula depth :   11 (   7 average)
%            Number of connectives :   35 (   4   ~;  14   |;  14   &)
%                                         (   3 <=>;   0  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of predicates  :    5 (   0 propositional; 2-2 arity)
%            Number of functors    :    0 (   0 constant; --- arity)
%            Number of variables   :   15 (   0 sgn;  10   !;   5   ?)
%            Maximal term depth    :    1 (   1 average)
% SPC      : FOF_THM_RFO_NEQ

% Comments : Translated from RM3 using the truth evaluation approach [PSH17].
%------------------------------------------------------------------------------
fof(nc1,conjecture,
( ! [A] :
? [B] :
( ( g_true_only(B,A)
& ( g_both(B,B)
| g_true_only(B,B) ) )
| ( g_both(B,A)
& ( g_false_only(B,B)
| g_true_only(B,B) ) )
| ( g_false_only(B,A)
& ( g_false_only(B,B)
| g_both(B,B) ) ) )
| ( ? [A] :
( ? [B] :
( g_both(B,A)
& g_both(B,B) )
& ~ ? [B] :
( ( g_true_only(B,A)
& ( g_both(B,B)
| g_true_only(B,B) ) )
| ( g_both(B,A)
& ( g_false_only(B,B)
| g_true_only(B,B) ) )
| ( g_false_only(B,A)
& ( g_false_only(B,B)
| g_both(B,B) ) ) ) )
& ~ ? [A] :
! [B] :
( ( g_true_only(B,A)
& g_false_only(B,B) )
| ( g_false_only(B,A)
& g_true_only(B,B) ) ) ) )).

fof(true_only_g,axiom,(
! [X_2,X_1] :
( g_true_only(X_2,X_1)
<=> ( g_true(X_2,X_1)
& ~ g_false(X_2,X_1) ) ) )).

fof(both_g,axiom,(
! [X_2,X_1] :
( g_both(X_2,X_1)
<=> ( g_true(X_2,X_1)
& g_false(X_2,X_1) ) ) )).

fof(false_only_g,axiom,(
! [X_2,X_1] :
( g_false_only(X_2,X_1)
<=> ( g_false(X_2,X_1)
& ~ g_true(X_2,X_1) ) ) )).

fof(exhaustion_g,axiom,(
! [X_2,X_1] :
( g_true_only(X_2,X_1)
| g_both(X_2,X_1)
| g_false_only(X_2,X_1) ) )).

%------------------------------------------------------------------------------
```