reserve n for Element of NAT,
  i for Integer,
  a, b, r for Real,
  x for Point of TOP-REAL n;

theorem
  CircleMap(R^1(1/2)) is being_homeomorphism
proof
  reconsider r = 0 as Integer;
  CircleMap(R^1(1/2+r)) is open;
  hence thesis by TOPREALA:16;
end;
