reserve L for Lattice,
  p,p1,q,q1,r,r1 for Element of L;
reserve x,y,z,X,Y,Z,X1,X2 for set;
reserve H,F for Filter of L;

theorem Th14:
  the carrier of L is Filter of L
proof
   the carrier of L =[#]L;
  hence thesis;
end;
