reserve AS for AffinSpace;
reserve a,b,c,d,a9,b9,c9,d9,p,q,r,x,y for Element of AS;
reserve A,C,K,M,N,P,Q,X,Y,Z for Subset of AS;

theorem Th46:
  K is being_line & M is being_line & X is being_plane & K c= X &
  M c= X & K<>M implies (K,M,A is_coplanar iff A c= X)
by Th26;
