Editing Incidence structure (section)

===Graphs===
Any [[Graph (discrete mathematics)|graph]] (which need not be [[simple graph|simple]]; [[Loop (graph theory)|loops]] and [[multiple edges]] are allowed) is a uniform incidence structure with two points per line. For these examples, the vertices of the graph form the point set, the edges of the graph form the line set, and incidence means that a vertex is an endpoint of an edge.