%------------------------------------------------------------------------------
% File     : REL013-1 : TPTP v8.2.0. Released v4.0.0.
% Domain   : Relation Algebra
% Problem  : Zero is annihilator
% Version  : [Mad95] (equational) axioms.
% English  :

% Refs     : [Mad95] Maddux (1995), Relation-Algebraic Semantics
%          : [Hoe08] Hoefner (2008), Email to G. Sutcliffe
% Source   : [Hoe08]
% Names    :

% Status   : Unsatisfiable
% Rating   : 0.13 v8.2.0, 0.19 v8.1.0, 0.16 v7.5.0, 0.18 v7.4.0, 0.24 v7.3.0, 0.23 v7.2.0, 0.25 v7.1.0, 0.18 v7.0.0, 0.15 v6.4.0, 0.29 v6.3.0, 0.30 v6.2.0, 0.40 v6.1.0, 0.27 v6.0.0, 0.14 v5.5.0, 0.25 v5.4.0, 0.22 v5.3.0, 0.40 v5.2.0, 0.25 v5.1.0, 0.33 v5.0.0, 0.40 v4.1.0, 0.22 v4.0.1, 0.25 v4.0.0
% Syntax   : Number of clauses     :   14 (  13 unt;   0 nHn;   1 RR)
%            Number of literals    :   15 (  15 equ;   2 neg)
%            Maximal clause size   :    2 (   1 avg)
%            Maximal term depth    :    5 (   2 avg)
%            Number of predicates  :    1 (   0 usr;   0 prp; 2-2 aty)
%            Number of functors    :    9 (   9 usr;   4 con; 0-2 aty)
%            Number of variables   :   25 (   0 sgn)
% SPC      : CNF_UNS_RFO_PEQ_NUE

% Comments : tptp2X -f tptp:short -t cnf:otter REL013+1.p
%------------------------------------------------------------------------------
%----Include axioms of relation algebra
include('Axioms/REL001-0.ax').
%------------------------------------------------------------------------------
cnf(goals_14,negated_conjecture,
    ( composition(sk1,zero) != zero
    | composition(zero,sk1) != zero ) ).

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