20-relative neighborhood graphs are hamiltonian

For any two points p and q in the Euclidean plane, define LUN_pq = { v | v ∈ R², d_pv < d_pq and d_qv < d_pq}, where d_uv is the Euclidean distance between two points u and v . Given a set of points V in the plane, let LUN_pq(V) = V ∩ LUN_pq. Toussaint defined the relative neighborhood graph of V, denoted by RNG(V) or simply RNG, to be the undirected graph with vertices V such that for each pair p,q ∈ V, (p,q) is an edge of RNG(V) if and only if LUN_pq (V) = ?. The relative neighborhood graph has several applications in pattern recognition that have been studied by Toussaint. We shall generalize the idea of RNG to define the k-relative neighborhood graph of V, denoted by kRNG(V) or simply kRNG, to be the undirected graph with vertices V such that for each pair p,q ∈ V, (p,q) is an edge of kRNG(V) if and only if | LUN_pq(V) | < k, for some fixed positive number k. It can be shown that the number of edges of a kRNG is less than O(kn). Also, a kRNG can be constructed in O(kn₂) time. Let E_c = {e_pq| p ∈ V and q ∈ V}. Then G_c = (V,E_c) is a complete graph. For any subset F of E_c, define the maximum distance of F as max_epq∈Fd_pq. A Euclidean bottleneck Hamiltonian cycle is a Hamiltonian cycle in graph G_c whose maximum distance is the minimum among all Hamiltonian cycles in graph G_c. We shall prove that there exists a Euclidean bottleneck Hamiltonian cycle which is a subgraph of 20RNG(V). Hence, 20RNGs are Hamiltonian.     

Almost all Cayley graphs are hamiltonian

It has been conjectured that there is a hamiltonian cycle in every finite connected Cayley graph. In spite of the difficulty in proving this conjecture, we show that almost all Cayley graphs are hamiltonian. That is, as the order n of a groupG approaches infinity, the ratio of the number of hamiltonian Cayley graphs ofG to the total number of Cayley graphs ofG approaches 1.Supported by the National Natural Science Foundation of China, Xinjiang Educational Committee and Xinjiang University.     

Almost all regular graphs are hamiltonian

In a previous article the authors showed that almost all labelled cubic graphs are hamiltonian. In the present article, this result is used to show that almost all r-regular graphs are hamiltonian for any fixed r ? 3, by an analysis of the distribution of 1-factors in random regular graphs. Moreover, almost all such graphs are r-edge-colorable if they have an even number of vertices. Similarly, almost all r-regular bipartite graphs are hamiltonian and r-edge-colorable for fixed r ? 3. © 1994 John Wiley & Sons, Inc.     

Weighted domination of cocomparability graphs

It is shown in this paper that the weighted domination problem and its three variants, the weighted connected domination, total domination, and dominating clique problems are NP-complete on cobipartite graphs when arbitrary integer vertex weights are allowed and all of them can be solved in polynomial time on cocomparability graphs if vertex weights are integers and less than or equal to a constant c. The results are interesting because cocomparability graphs properly contain cobipartite graphs and the cardinality cases of the above problems are trivial on cobipartite graphs. On the other hand, an O(¦V¦²) algorithm is given for the weighted independent perfect domination problem of a cocomparability graph G = (V.E).     

Node packings on cocomparability graphs

We give a compact formulation for the clique inequalities defining the fractional node packing polytope on cocomparability graphs.     

Graphs that admit square 1-factorizations are hamiltonian Cayley graphs

A square 1-factorization of a graph is a 1-factorization in which the union of any two distinct 1-factors is a disjoint union of 4-cycles. We show that a graph admits a square 1-factorization if and only if it is a Cayley graph with group (₂) ⁿ for somen. The rest of the title follows since Cayley graphs of abelian groups are known to be hamiltonian.     

The graphs for which all strong orientations are hamiltonian

We show that the only nontrivial strongly orientable graphs for which every strong oreintation is Hamiltonian are complete graphs and cycles.     

Treewidth of cocomparability graphs and a new order-theoretic parameter

We show that the pathwidth of a cocomparability graphG equals its treewidth. The proof is based on a new notion, calledinterval width, for a partial orderP, which is the smallest width of an interval order contained inP, and which is shown to be equal to the treewidth of its cocomparability graph. We observe also that determining any of these parameters isNP-hard and we establish some connections between classical dimension notions of partial orders and interval width. In fact we develop approximation algorithms for interval width ofP whose performance ratios depend on the dimension and interval dimension ofP, respectively.This work was done while the second author stayed at the LIRMM within the PROCOPE program of the DAAD. Both authors acknowledge the support by the PROCOPE program. The second author also acknowledges partial support by the Deutsche Forschungsgemeinschaft under Grant No Mo446/3-1.     

Chromatic properties of hamiltonian graphs

We study the problem of the location of real zeros of chromatic polynomials for some families of graphs. In particular, a problem presented by Thomassen (see [On the number of hamiltonian cycles in bipartite graphs, Combin. Probab. Comput. 5 (1996) 437–442.]) is discussed and a result for hamiltonian graphs is presented. An open problem is stated for 2-connected graphs with a hamiltonian path.     

Extremal maximal uniquely hamiltonian graphs

Let G be a graph of order n with exactly one Hamiltonian cycle and suppose that G is maximal with respect to this property. We determine the minimum number of edges G can have.     

Tough graphs and hamiltonian circuits

The toughness of a graph G is defined as the largest real number t such that deletion of any s points from G results in a graph which is either connected or else has at most s/t components. Clearly, every hamiltonian graph is 1-tough. Conversely, we conjecture that for some t₀, every t₀-tough graph is hamiltonian. Since a square of a k-connected graph is always k-tough, a proof of this conjecture with t₀ = 2 would imply Fleischner's theorem (the square of a block is hamiltonian). We construct an infinite family of ($\text{3}\text{2}$)-tough nonhamiltonian graphs.     

Contractions and hamiltonian line graphs

Using the contraction method, we find a best possible condition involving the minimum degree for a triangle-free graph to have a spanning eulerian subgraph.     

Characterization of special hamiltonian graphs

We get a formula for the number of hamiltonian circuits of a graph through which we characterize the special hamiltonian graphs, that is containing a dominant circuit of minimal length.