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A directed graph is a graph with directed edges. Loops and 2-cycles are usually allowed. See also the tag *quiver*.

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How can you compute the number of topological sorts in a DAG?

If you have a directed acyclic graph (DAG) $G$, a topological sort is just an ordering of the vertices such that if an edge $x \to y$ exists in $G$, then the index of $x$ is less than the index of $y$ …
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