reserve L for Lattice;
reserve X,Y,Z,V for Element of L;
reserve L for D_Lattice;
reserve X,Y,Z for Element of L;
reserve L for 0_Lattice;
reserve X,Y,Z for Element of L;

theorem
  X [= Y & Y "/\" Z = Bottom L implies X "/\" Z = Bottom L by Th9,LATTICES:9;
