%--------------------------------------------------------------------------
% File     : GEO018-3 : TPTP v8.2.0. Released v1.0.0.
% Domain   : Geometry
% Problem  : Corollary 2 to symmetries of equidistance
% Version  : [Qua89] axioms : Augmented.
% English  : Show that if the distance from A to B equals the distance
%            from C to D, then the distance from B to A equals the
%            distance from D to C.

% Refs     : [SST83] Schwabbauser et al. (1983), Metamathematische Methoden
%          : [Qua89] Quaife (1989), Automated Development of Tarski's Geome
% Source   : [Qua89]
% Names    : D4.2 [Qua89]

% Status   : Unsatisfiable
% Rating   : 0.00 v7.0.0, 0.07 v6.4.0, 0.00 v6.2.0, 0.10 v6.1.0, 0.07 v6.0.0, 0.10 v5.3.0, 0.11 v5.2.0, 0.12 v5.0.0, 0.07 v4.1.0, 0.08 v4.0.1, 0.09 v3.7.0, 0.00 v3.3.0, 0.07 v3.2.0, 0.00 v3.1.0, 0.09 v2.7.0, 0.08 v2.6.0, 0.00 v2.0.0
% Syntax   : Number of clauses     :   23 (   9 unt;   5 nHn;  19 RR)
%            Number of literals    :   63 (   7 equ;  37 neg)
%            Maximal clause size   :    8 (   2 avg)
%            Maximal term depth    :    2 (   1 avg)
%            Number of predicates  :    3 (   2 usr;   0 prp; 2-4 aty)
%            Number of functors    :   12 (  12 usr;   7 con; 0-6 aty)
%            Number of variables   :   81 (   3 sgn)
% SPC      : CNF_UNS_RFO_SEQ_NHN

% Comments :
%--------------------------------------------------------------------------
%----Include Tarski geometry axioms
include('Axioms/GEO002-0.ax').
%--------------------------------------------------------------------------
cnf(d1,axiom,
    equidistant(U,V,U,V) ).

cnf(d2,axiom,
    ( ~ equidistant(U,V,W,X)
    | equidistant(W,X,U,V) ) ).

cnf(d3,axiom,
    ( ~ equidistant(U,V,W,X)
    | equidistant(V,U,W,X) ) ).

cnf(u_to_v_equals_w_to_x,hypothesis,
    equidistant(u,v,w,x) ).

cnf(prove_symmetry,negated_conjecture,
    ~ equidistant(v,u,x,w) ).

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