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Published online by Cambridge University Press: 12 September 2008
Associate to a finite labeled graph G(V, E) its multiset of neighborhoods
(G) = {N(υ): υ ∈ V}. We discuss the question of when a list
is realizable by a graph, and to what extent G is determined by
(G). The main results are: the decision problem
is NP-complete; for bipartite graphs the decision problem is polynomially equivalent to Graph Isomorphism; forests G are determined up to isomorphism by
(G); and if G is connected bipartite and
(H) =
(G), then H is completely described.