## TPTP Problem File: SEV439+1.p

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```%------------------------------------------------------------------------------
% File     : SEV439+1 : TPTP v7.5.0. Released v6.4.0.
% Domain   : Set Theory
% Problem  : Ordinal numbers
% Version  : [Pas05] axioms.
% English  :

% Refs     : [Pas05] Pastre (2005), Email to G. Sutcliffe
% Source   : [TPTP]
% Names    :

% Status   : Satisfiable
% Rating   : 1.00 v6.4.0
% Syntax   : Number of formulae    :   19 (   1 unit)
%            Number of atoms       :   65 (   4 equality)
%            Maximal formula depth :   11 (   6 average)
%            Number of connectives :   49 (   3   ~;   3   |;  16   &)
%                                         (  17 <=>;  10  =>;   0  <=;   0 <~>)
%                                         (   0  ~|;   0  ~&)
%            Number of predicates  :    9 (   0 propositional; 1-3 arity)
%            Number of functors    :   13 (   3 constant; 0-3 arity)
%            Number of variables   :   56 (   0 sgn;  53   !;   3   ?)
%            Maximal term depth    :    3 (   1 average)
% SPC      : FOF_SAT_RFO_SEQ