Let $M = (X, \mathcal{T}, d)$ be a D1107: Metric space such that
| (i) | $E \subseteq X$ is a D78: Subset of $X$ |
| (ii) | $E$ is a D17: Finite set |
Then
\begin{equation}
X \setminus E \in \mathcal{T}
\end{equation}