𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Bandwidth of theta graphs with short paths

✍ 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.

✦ 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.


πŸ“œ SIMILAR VOLUMES


The edge-bandwidth of theta graphs
✍ Dennis Eichhorn; Dhruv Mubayi; Kevin O'Bryant; Douglas B. West πŸ“‚ Article πŸ“… 2000 πŸ› John Wiley and Sons 🌐 English βš– 129 KB

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

Line graphs of bipartite graphs with Ham
✍ Francis K. Bell πŸ“‚ Article πŸ“… 2003 πŸ› John Wiley and Sons 🌐 English βš– 115 KB

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 Γ€2: The maximal graph is the line graph of K m,m if t ΒΌ 2mΓ€1, and of K m,m ΓΎ1 if t ΒΌ 2m. This result yields a characterization of L(G ) wh

On the Inapproximability of Disjoint Pat
✍ Bin Ma; Lusheng Wang πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 230 KB

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

Characterization of edge-colored complet
✍ Jinfeng Feng; Hans-Erik Giesen; Yubao Guo; Gregory Gutin; Tommy Jensen; Arash Ra πŸ“‚ Article πŸ“… 2006 πŸ› John Wiley and Sons 🌐 English βš– 164 KB

## Abstract An edge‐colored graph __H__ is properly colored if no two adjacent edges of __H__ have the same color. In 1997, J. Bang‐Jensen and G. Gutin conjectured that an edge‐colored complete graph __G__ has a properly colored Hamilton path if and only if __G__ has a spanning subgraph consisting

Partitions of a graph into paths with pr
✍ Hikoe Enomoto; Katsuhiro Ota πŸ“‚ Article πŸ“… 2000 πŸ› John Wiley and Sons 🌐 English βš– 95 KB πŸ‘ 3 views

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

Relative length of long paths and cycles
✍ Hikoe Enomoto; Jan van den Heuvel; Atsushi Kaneko; Akira Saito πŸ“‚ Article πŸ“… 1995 πŸ› John Wiley and Sons 🌐 English βš– 601 KB

## 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__) ≧ n for all triples __u, v, w__ of independent verti