Graph
A simple undirected graph is tuple
the vertex set and an edge set. This is normally referred to as . As this is undirected an edge is the same as the edge , so if we define an equivalence relation for all then it is fairer to say .
Representations
Visual representation
This is normally represented as a series of points and lines like the simple graph below.
Transclude of simple_graphThis graph would have formal definition
For representations in computer look at graph representations.