For integers a and b, 0 s a s b, an [a,bl-graph G satisfies a s deg(x,G) s b for every vertex x of G, and an [a.bl-factor is a spanning subgraph its edges can be decomposed into [a,bl-factors. When both k and tare positive integers and s is a nonnegative integer, w e prove that every [(12k + 2)t +
Factorization of regular multigraphs into regular graphs
β Scribed by S. I. El-Zanati; M. J. Plantholt; S. K. Tipnis
- Publisher
- John Wiley and Sons
- Year
- 1995
- Tongue
- English
- Weight
- 618 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
A regular multigraph with maximum multiplicity r and degree rs cannot always be factored into r sβregular simple graphs. It is shown, however, that under general conditions a similar factorization can be achieved if we first allow the addition or deletion of a relatively small number of hamilton cycles. Based on this result, we give extensions of some known factorization results on simple graphs to new results on multigraphs. Β© 1995 John Wiley & Sons, Inc.
π SIMILAR VOLUMES
Given r 3 3 and 1 s A s r, we determine all values of k for which every r-regular graph with edge-connectivity A has a k-factor. Some of the earliest results in graph theory are due to Petersen [8] and concern factors in graphs. Among others, Petersen proved that a regular graph of even degree has a
Katerinis, P., Regular factors in regular graphs, Discrete Mathematics 113 (1993) 269-274. Let G be a k-regular, (k -I)-edge-connected graph with an even number of vertices, and let m be an integer such that 1~ m s k -1. Then the graph obtained by removing any k -m edges of G, has an m-factor.
## Abstract In this article, we obtain a sufficient condition for the existence of regular factors in a regular graph in terms of its third largest eigenvalue. We also determine all values of __k__ such that every __r__βregular graph with the third largest eigenvalue at most has a __k__βfactor.
The proof of the following theorem is given: A complete graph with n vertkes can he decomposed into r regular bichromatic factors if and only if n is even and greater thl;iirl 4 and there exists $1 natural number k with the properties that k < r anu. ak-l < n 5 Zk.