- graphscope.nx.generators.expanders.chordal_cycle_graph(p, create_using=None)[source]#
Returns the chordal cycle graph on p nodes.
The returned graph is a cycle graph on p nodes with chords joining each vertex x to its inverse modulo p. This graph is a (mildly explicit) 3-regular expander 1.
p must be a prime number.
p (a prime number) – The number of vertices in the graph. This also indicates where the chordal edges in the cycle will be created.
create_using (NetworkX graph constructor, optional (default=nx.Graph)) – Graph type to create. If graph instance, then cleared before populated.
G – The constructed undirected multigraph.
- Return type
NetworkXError – If create_using indicates directed or not a multigraph.
Theorem 4.4.2 in A. Lubotzky. “Discrete groups, expanding graphs and invariant measures”, volume 125 of Progress in Mathematics. Birkhäuser Verlag, Basel, 1994.