Let G be a connected graph, where k 2. S. Smith conjectured that every two longest cycles of G have at least k vertices in common. In this note, we show that every two longest cycles meet in at least ck 3Â5 vertices, where cr0.2615. ## 1998 Academic Press In this note, we provide a lower bound on
Nonseparating cycles in K-Connected graphs
✍ Scribed by Carsten Thomassen
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 192 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
We show that every k‐connected graph with no 3‐cycle contains an edge whose contraction results in a k‐connected graph and use this to prove that every (k + 3)‐connected graph contains a cycle whose deletion results in a k‐connected graph. This settles a problem of L. Lovász.
📜 SIMILAR VOLUMES
## Abstract In this article, we prove the following theorem. Let __k__ ≥ 3 be an integer, __G__ be a __k__‐connected graph with minimum degree __d__ and __X__ be a set of __k__ + 1 vertices on a cycle. Then __G__ has a cycle of length at least min {2d,|V(G)|} passing through __X__. This result give
Moon and Moser in 1963 conjectured that if G is a 3-connected planar graph on n vertices, then G contains a cycle of length at least Oðn log 3 2 Þ: In this paper, this conjecture is proved. In addition, the same result is proved for 3-connected graphs embeddable in the projective plane, or the torus
## Abstract For a graph __G__, a subset __S__ of __V__(__G__) is called a shredder if __G__ − __S__ consists of three or more components. We show that if __k__ ≥ 4 and __G__ is a __k__‐connected graph, then the number of shredders of cardinality __k__ of __G__ is less than 2|__V__(__G__)|/3 (we sho
## Abstract In this paper, we show that every 3‐connected claw‐free graph on n vertices with δ ≥ (__n__ + 5)/5 is hamiltonian. © 1993 John Wiley & Sons, Inc.
## Abstract M. Matthews and D. Sumner have proved that of __G__ is a 2‐connected claw‐free graph of order __n__ such that δ ≧ (__n__ − 2)/3, then __G__ is hamiltonian. We prove that the bound for the minimum degree δ can be reduced to __n__/4 under the additional condition that __G__ is not in __F_