reserve n,m for Nat;
reserve p,q,r for Element of Nat_Lattice;
reserve p,q,r for Element of Nat_Lattice;
reserve m,n for NatPlus;
reserve p,q for Element of NatPlus_Lattice;

theorem
  for L being Lattice holds L is SubLattice of L
proof
  let L be Lattice;
  thus the carrier of L c= the carrier of L;
  thus thesis by Lm5;
end;
