A distinct distance set (DD set) for a graph G is a vertex subset of G with the property that for ISI = s, we have (~) distinct distances of the pairs of vertices in S. In this article, it is shown that (a) For 6 ~< k ~< 18 there exists a tree T with DD(T) = k and din(T) = LB(k) < B~(Kk). where LB(
Distinct distance sets in a graph
โ Scribed by Richard A. Gibbs; Peter J. Slater
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 987 KB
- Volume
- 93
- Category
- Article
- ISSN
- 0012-365X
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โฆ Synopsis
The problem of labelling the complete graph K,, as near to graceful as possible is equivalent to the 'Golomb ruler problem' of finding as short a ruler as possible with n integer marks such that the distances between pairs of marks are all distinct. We generalize this to an association between labellings of K,, with m-tuples and 'distinct distance sets' in m-dimensional grids. More generally, we define distinct distance sets for any graph G and investigate the parameter DD(G) which is the maximum size of a distinct distance set in G.
๐ SIMILAR VOLUMES
Given positive integers m, k, and s with m > ks, let D m,k,s represent the set {1, 2, . . . , m} -{k, 2k, . . . , sk}. The distance graph G(Z, D m,k,s ) has as vertex set all integers Z and edges connecting i and j whenever |i -j| โ D m,k,s . The chromatic number and the fractional chromatic number
Taylor, H., A distinct distance set of 9 nodes in a tree of diameter 36, Discrete Mathematics 93 (1991) 167-168.
Let โซ be a distance-regular graph with l (1 , a 1 , b 1 ) ฯญ 1 and c s ฯฉ 1 ฯญ 1 for some positive integer s . We show the existence of a certain distance-regular graph of diameter s , containing given two vertices at distance s , as a subgraph in โซ .