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 directed graphs with 3 or 4 vertices and undirected graphd with 3 to 6 vertices.

## Arguments

- size
The number of vertices in the graph.

- number
The isomorphism class.

- directed
Whether to create a directed graph (the default).

## See also

Other graph isomorphism:
`canonical_permutation()`

,
`count_isomorphisms()`

,
`count_subgraph_isomorphisms()`

,
`isomorphic()`

,
`isomorphism_class()`

,
`isomorphisms()`

,
`subgraph_isomorphic()`

,
`subgraph_isomorphisms()`