Plummer, M.D., Extending matchings in planar graphs IV, Discrete Mathematics 109 (1992) 207-219. The structure of certain non-Zextendable planar graphs is studied first. In particular, 4-connected S-regular planar graphs which are not 2-extendable are investigated and examples of these are presented
Extending matchings in claw-free graphs
✍ Scribed by Michael D. Plummer
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 506 KB
- Volume
- 125
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
✦ Synopsis
Let G be a graph with a perfect matching and let n be an integer,
has a perfect matching for every pair of points u and v in V(G). It is proved that every 3-connected claw-free graph is bicritical and for n>2, every (2n+ l)-connected claw-free graph is n-extendable.
Matching extension in planar and toroidal claw-free graphs is then considered.
📜 SIMILAR VOLUMES
A graph G on at least 2n + 2 vertices in n-extendable if every set of n independent edges extends to (i.e., is a subset of) a perfect matching in G. It is known that no planar graph is 3-extendable. In the present paper we continue to study 2-extendability in the plane. Suppose independent edges el
## Abstract We say that __G__ is almost claw‐free if the vertices that are centers of induced claws (__K__~1,3~) in __G__ are independent and their neighborhoods are 2‐dominated. Clearly, every claw‐free graph is almost claw‐free. It is shown that (i) every even connected almost claw‐free graph has
We say that a simple graph G is induced matching extendable, shortly IM-extendable, if every induced matching of G is included in a perfect matching of G. The main results of this paper are as follows: (1) For every connected IM-extendable graph 2 |V (G)| -2; the equality holds if and only if G ∼
## Abstract The circular chromatic number of a graph is a well‐studied refinement of the chromatic number. Circular‐perfect graphs form a superclass of perfect graphs defined by means of this more general coloring concept. This article studies claw‐free circular‐perfect graphs. First, we prove that