%------------------------------------------------------------------------------
% File     : NUN082+1 : TPTP v7.4.0. 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   : 0.62 v7.3.0
% Syntax   : Number of formulae    :   19 (   1 unit)
%            Number of atoms       :   80 (   0 equality)
%            Maximal formula depth :   13 (   8 average)
%            Number of connectives :   95 (  34   ~;  26   |;  35   &)
%                                         (   0 <=>;   0  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of predicates  :    5 (   0 propositional; 1-3 arity)
%            Number of functors    :    0 (   0 constant; --- arity)
%            Number of variables   :   72 (   0 sgn;  47   !;  25   ?)
%            Maximal term depth    :    1 (   1 average)
% 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) ) ) )).

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