On the basis of the observation that a 3-regular graph has a perfect matching if and only if its line graph has a triangle-free 2 -factorisation, we show that a connected 4-regular graph has a triangle-free 2 -factorisation, provided it has no more than two cut-vertices belonging to a triangle. This
On Petersen's graph theorem
β Scribed by Nathan Linial
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 399 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
β¦ Synopsis
In thiq paper we prove the following: let G be a graph with k edges, wihich js (k -l)-edgeconnectd, and with all valences 3k k. Let 1 c r~ k be an integer, then (3 -tins a spanning subgraph H, so that all valences in H are ar, with no more than r~/r:] edges. The proof is based on a useful extension of Tutte's factor theorem [4,5], due to JN&Z [3]. For other extensions of Petersen's theorem, see [6,7, $1.
π SIMILAR VOLUMES
Goemans, M.X., A generalization of Petersen's theorem, Discrete Mathematics 115 (1993) 277-282. Petersen's theorem asserts that any cubic graph with at most 2 cut edges has a perfect matching. We generalize this classical result by showing that any cubic graph G = (V, E) with at most 1 cut edge has
Petersen's theorem is a classic result in matching theory from 1891, stating that every 3-regular bridgeless graph has a perfect matching. Our work explores efficient algorithms for finding perfect matchings in such graphs. Previously, the only relevant matching algorithms were for general graphs, a
## Abstract A graph Ξ is locally Petersen if, for each point __t__ of Ξ, the graph induced by Ξ on all points adjacent to __t__ is isomorphic to the Petersen graph. We prove that there are exactly three isomorphism classes of connected, locally Petersen graphs and further characterize these graphs
Any 3-edge-connected graph with at most 10 edge cuts of size 3 either has a spanning closed trail or it is contractible to the Petersen graph.