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
Regular Graphs, Eigenvalues and Regular Factors
β Scribed by Hongliang Lu
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 97 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0364-9024
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β¦ Synopsis
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 rβregular graph with the third largest eigenvalue at most has a kβfactor.
π SIMILAR VOLUMES
In this paper the expectation and variance of the number of 2-factors in random r-regular graphs for any fixed r 2 3 is analyzed and the asymptotic distribution of this variable is determined.
## Abstract We show that every connected __K__~1,3~βfree graph with minimum degree at least __2k__ contains a __k__βfactor and construct connected __K__~1,3~βfree graphs with minimum degree __k__ + __0__(β__k__) that have no __k__βfactor.
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 +
We show that any k-regular bipartite graph with 2n vertices has at least \ (k&1) k&1 k k&2 + n perfect matchings (1-factors). Equivalently, this is a lower bound on the permanent of any nonnegative integer n\_n matrix with each row and column sum equal to k. For any k, the base (k&1) k&1 Γk k&2 is l