## TPTP Problem File: NUN082+1.p

View Solutions - Solve Problem

```%------------------------------------------------------------------------------
% File     : NUN082+1 : TPTP v8.1.2. Released v7.3.0.
% Domain   : Number Theory
% Problem  : Robinson arithmetic: There exists X * 1 = 0
% Version  : Especial.
% English  :

% Refs     : [BBJ03] Boolos et al. (2003), Computability and Logic
%          : [Smi07] Smith (2007), An Introduction to Goedel's Theorems
%          : [Lam18] Lampert (2018), Email to Geoff Sutcliffe
% Source   : [Lam18]
% Names    : xtimesoneidzero [Lam18]

% Status   : Theorem
% Rating   : 0.47 v8.1.0, 0.50 v7.5.0, 0.62 v7.3.0
% Syntax   : Number of formulae    :   19 (   1 unt;   0 def)
%            Number of atoms       :   80 (   0 equ)
%            Maximal formula atoms :    7 (   4 avg)
%            Number of connectives :   95 (  34   ~;  26   |;  35   &)
%                                         (   0 <=>;   0  =>;   0  <=;   0 <~>)
%            Maximal formula depth :   13 (   8 avg)
%            Maximal term depth    :    1 (   1 avg)
%            Number of predicates  :    5 (   5 usr;   0 prp; 1-3 aty)
%            Number of functors    :    0 (   0 usr;   0 con; --- aty)
%            Number of variables   :   72 (  47   !;  25   ?)
% SPC      : FOF_THM_RFO_NEQ

% Comments : Translated to FOL without equality.
%------------------------------------------------------------------------------
include('Axioms/NUM009+0.ax').
%------------------------------------------------------------------------------
fof(xtimesoneidzero,conjecture,
? [Y1,Y2] :
( ? [Y3] :
( r4(Y1,Y3,Y2)
& ? [Y4] :
( r1(Y4)
& r2(Y4,Y3) ) )
& ? [Y5] :
( id(Y2,Y5)
& r1(Y5) ) ) ).

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