The isomorphism class is a non-negative integer number.
Graphs (with the same number of vertices) having the same isomorphism
class are isomorphic and isomorphic graphs always have the same
isomorphism class. Currently it can handle only graphs with 3 or 4
vertices.

Usage

isomorphism_class(graph, v)

Arguments

graph

The input graph.

v

Optionally a vertex sequence. If not missing, then an induced
subgraph of the input graph, consisting of this vertices, is used.