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The formal definition is: | The formal definition is: | ||
If v and w are vertices, an edge is an unordered pair {v,w}, while a directed edge, called an arc, is an ordered pair (v,w) or (w,v). | If v and w are vertices, an edge is an unordered pair {v,w}, while a directed edge, called an arc, is an ordered pair (v,w) or (w,v). | ||
[[Category: ISM Terminology]] | |||