
theorem
  for T being naturally_generated non empty with_equivalence TopRelStr,
      A being Subset of T holds
    BndAp A = Fr A
  proof
    let T be naturally_generated non empty with_equivalence TopRelStr,
        A be Subset of T;
    UAp A = Cl A & Int A = LAp A by UApCl,LApInt;
    hence thesis;
  end;
