An edge-labeling f of a graph G is an injection from E(G) to the set of integers. The edge-bandwidth of G is B H (G) min f {B H (f )}, where B H (f ) is the maximum difference between labels of incident edges of G. The theta graph Γ(l 1 , F F F ,l m ) is the graph consisting of m pairwise internally
Bandwidth of theta graphs with short paths
β Scribed by G.W. Peck; Aditya Shastri
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 628 KB
- Volume
- 103
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
Peck, G.W. and A. Shastri, Bandwidth of theta graphs with short paths, Discrete Mathematics 103 (1992) 177-187.
The bandwidth problem for a graph is that of labelling its vertices with distinct integers so that the maximum difference across an edge is minimized.
We here solve this problem for all theta graphs. These are graphs which consist of two terminal vertices and a number of paths of possibly varying length between these. Chvatalova and Opatrny (1988) resolved this question when each path has (edge) length at least 4 or all paths have length 3.
π SIMILAR VOLUMES
It is shown that, if t is an integer !3 and not equal to 7 or 8, then there is a unique maximal graph having the path P t as a star complement for the eigenvalue Γ2: The maximal graph is the line graph of K m,m if t ΒΌ 2mΓ1, and of K m,m ΓΎ1 if t ΒΌ 2m. This result yields a characterization of L(G ) wh
In this paper, we study the inapproximability of several well-known optimization problems in network optimization. We show-that the max directed vertex-disjoint paths problem cannot be approximated within ratio 2 log 1&= n unless NP DTIME[2 polylog n ], the max directed edge-disjoint paths problem c
## Abstract An edgeβcolored graph __H__ is properly colored if no two adjacent edges of __H__ have the same color. In 1997, J. BangβJensen and G. Gutin conjectured that an edgeβcolored complete graph __G__ has a properly colored Hamilton path if and only if __G__ has a spanning subgraph consisting
For a graph G, let ' 2 (G ) denote the minimum degree sum of a pair of nonadjacent vertices. We conjecture that if |V(G)| n i 1 k a i and ' 2 (G ) ! n k Γ 1, then for any k vertices v 1 , v 2 , F F F , v k in G, there exist vertex-disjoint paths P 1 , P 2 , F F F , P k such that |V (P i )| a i and v
## Abstract For a graph __G, p__(__G__) denotes the order of a longest path in __G__ and __c__(__G__) the order of a longest cycle. We show that if __G__ is a connected graph __n__ β₯ 3 vertices such that __d__(__u__) + __d__(__v__) + __d__(__w__) β§ n for all triples __u, v, w__ of independent verti