Let $\emptyset$ be the D13: Empty set.
Let $X$ be a D11: Set such that
Let $X$ be a D11: Set such that
(i) | $\mathcal{P}(X)$ is the D80: Power set of $X$ |
Then
\begin{equation}
\mathcal{P}(X) \neq \emptyset
\end{equation}