reserve a,b,r for non unit non zero Real;
reserve X for non empty set,
        x for Tuple of 4,X;
reserve V             for RealLinearSpace,
        A,B,C,P,Q,R,S for Element of V;

theorem
  for T being RealLinearSpace st T = TOP-REAL 1
  for x,y,z being Element of T holds x,y,z are_collinear by Th25;
