theorem
  for V being RightMod of R holds LattStr (# Submodules(V), SubJoin(V),
    SubMeet(V) #) is 01_Lattice
proof
  let V be RightMod of R;
  LattStr (# Submodules(V), SubJoin(V), SubMeet(V) #) is lower-bounded
  upper-bounded Lattice by Th48,Th49;
  hence thesis;
end;
