## TPTP Problem File: SET095+1.p

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```%--------------------------------------------------------------------------
% File     : SET095+1 : TPTP v8.0.0. Bugfixed v5.4.0.
% Domain   : Set Theory
% Problem  : Property 2 of singletons
% Version  : [Qua92] axioms : Reduced & Augmented > Complete.
% English  :

% Refs     : [Qua92] Quaife (1992), Automated Deduction in von Neumann-Bern
%          : [BL+86] Boyer et al. (1986), Set Theory in First-Order Logic:
% Source   : [Qua92]
% Names    :

% Status   : Theorem
% Rating   : 0.31 v7.5.0, 0.34 v7.4.0, 0.23 v7.3.0, 0.31 v7.2.0, 0.28 v7.1.0, 0.26 v7.0.0, 0.27 v6.4.0, 0.31 v6.3.0, 0.33 v6.2.0, 0.32 v6.1.0, 0.43 v6.0.0, 0.39 v5.5.0, 0.52 v5.4.0
% Syntax   : Number of formulae    :   44 (  16 unt;   0 def)
%            Number of atoms       :  102 (  19 equ)
%            Maximal formula atoms :    4 (   2 avg)
%            Number of connectives :   63 (   5   ~;   3   |;  26   &)
%                                         (  19 <=>;  10  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    7 (   4 avg)
%            Maximal term depth    :    4 (   1 avg)
%            Number of predicates  :    6 (   5 usr;   0 prp; 1-2 aty)
%            Number of functors    :   26 (  26 usr;   5 con; 0-3 aty)
%            Number of variables   :   88 (  83   !;   5   ?)
% SPC      : FOF_THM_RFO_SEQ