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Set of subdigraphs
Formulation 0
Let $G_X = (X, \mathcal{E}_X)$ be a D2696: Digraph.
The set of subdigraphs of $G_X$ is the D11: Set \begin{equation} \{ G_E = (E, \mathcal{E}_E) \mid E \subseteq X \text{ and } \mathcal{E}_E \subseteq \mathcal{E}_X \} \end{equation}