A graph with no edges
See also
Other deterministic constructors:
graph_from_atlas(),
graph_from_edgelist(),
graph_from_literal(),
make_(),
make_chordal_ring(),
make_circulant(),
make_full_citation_graph(),
make_full_graph(),
make_full_multipartite(),
make_graph(),
make_lattice(),
make_ring(),
make_star(),
make_tree(),
make_turan()
