%------------------------------------------------------------------------------
% File     : NUN086+2 : TPTP v9.0.0. Released v7.3.0.
% Domain   : Number Theory
% Problem  : Robinson arithmetic: 0 * 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    : zerotimesoneeqzero [Lam18]

% Status   : Theorem
% Rating   : 0.27 v9.0.0, 0.31 v8.2.0, 0.28 v7.5.0, 0.31 v7.4.0, 0.20 v7.3.0
% Syntax   : Number of formulae    :   12 (   0 unt;   0 def)
%            Number of atoms       :   50 (  18 equ)
%            Maximal formula atoms :    6 (   4 avg)
%            Number of connectives :   52 (  14   ~;  10   |;  28   &)
%                                         (   0 <=>;   0  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    9 (   7 avg)
%            Maximal term depth    :    1 (   1 avg)
%            Number of predicates  :    5 (   4 usr;   0 prp; 1-3 aty)
%            Number of functors    :    0 (   0 usr;   0 con; --- aty)
%            Number of variables   :   48 (  23   !;  25   ?)
% SPC      : FOF_THM_RFO_SEQ

% Comments : Translated to FOL with equality.
%------------------------------------------------------------------------------
include('Axioms/NUM008+0.ax').
%------------------------------------------------------------------------------
fof(zerotimesoneeqzero,conjecture,
    ? [Y1] :
      ( ? [Y2] :
          ( ? [Y3] :
              ( r1(Y3)
              & r2(Y3,Y2) )
          & ? [Y4] :
              ( r1(Y4)
              & r4(Y4,Y2,Y1) ) )
      & ? [Y5] :
          ( r1(Y5)
          & Y1 = Y5 ) ) ).

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