(thing) by rp Thu Jun 22 2000 at 17:01:31
A directed graph is a set of nodes (or vertices) with a set of ordered pairs of nodes called the arrows.

The custom is to use the unqualified term 'graph' for the unordered variant.

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(idea) by artemis entreri Fri Dec 29 2000 at 2:00:58

In combinatorics, a directed graph or digraph is a graph in which the edges have an explicit direction, thus the set of edges becomes a set of ordered pairs.

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