 For example, the edge density (i.e.average degree divided by number of vertices) of formula_59 is given by the integral
formula_112
This is because formula_7 is formula_114-valued, and each edge formula_115
in formula_59 
corresponds to a region formula_117
of area formula_118 where formula_7 equals formula_120.Similar reasoning shows that the number of triangles in formula_59 is equal to
formula_122

There are many different ways to measure the distance between two graphs.