%--------------------------------------------------------------------------
% File     : MSC007-2.002 : TPTP v9.0.0. Bugfixed v2.1.0.
% Domain   : Miscellaneous
% Problem  : Cook pigeon-hole problem
% Version  : [Pel88] axioms : Especial.
% English  : Suppose there are N holes and N+1 pigeons to put in the
%            holes. Every pigeon is in a hole and no hole contains more
%            than one pigeon. Prove that this is impossible. The size is
%            the number of pigeons.

% Refs     : [CR79]  Cook & Reckhow (1979), The Relative Efficiency of Prop
%          : [Pel86] Pelletier (1986), Seventy-five Problems for Testing Au
%          : [Pel88] Pelletier (1988), Errata
% Source   : [Pel86]
% Names    : Pelletier 73 (Size 4) [Pel86]

% Status   : Unsatisfiable
% Rating   : 0.00 v2.0.0
% Syntax   :

% Comments : This problem is incorrect in [Pel86] and is corrected in [Pel88].
%          : tptp2X: -ftptp -s2 MSC007-2.g
% Bugfixes : v2.1.0 - Replaced by a new SOTA size.
%--------------------------------------------------------------------------