Let $T = (X, \mathcal{T})$ be a D465: Hausdorff topological space such that
| (i) | $E \subseteq X$ is a D17: Finite set |
Then
| (1) | $E$ is a D98: Closed set in $T$ |
| (2) | $X \setminus E$ is a D97: Open set in $T$ |