**Graph theory** is the study of special structures called graphs.

## Terminology

- Graph - a graph is used to represent pairwise relations between objects. It is usually represented as an ordered pair
*G*= (*V*,*E*) of a set of its "vertices"*V*containing the objects in it, and a multiset of its "edges"*E*, which is the relation between the edges.

## External links

- Graph on Programming Wiki

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