## Abstract Thomassen [J Graph Theory 7 (1983), 261β271] conjectured that for all positive integers __k__ and __m__, every graph of minimum degree at least __k__+1 contains a cycle of length congruent to 2__m__ modulo __k__. We prove that this is true for __k__β©Ύ2 if the minimum degree is at least 2
Bipartite graphs with cycles of all even lengths
β Scribed by Edward Schmeichel; John Mitchem
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 428 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
Let G = (X, Y, E) be a bipartite graph with X = Y = n. ChvΓ‘tal gave a condition on the vertex degrees of X and Y which implies that G contains a Hamiltonian cycle. It is proved here that this condition also implies that G contains cycles of every even length when n > 3.
π SIMILAR VOLUMES
A Halin graph is a plane graph H = T U C, where T is a plane tree with no vertex of degree t w o and at least one vertex of degree three or more, and C is a cycle connecting the endvertices of T in the cyclic order determined by the embedding of T We prove that such a graph on n vertices contains cy
It is easy to see that planar graphs without 3-cycles are 3-degenerate. Recently, it was proved that planar graphs without 5-cycles are also 3-degenerate. In this paper it is shown, more surprisingly, that the same holds for planar graphs without 6-cycles.
A graph is called weakly triangulated if it contains no chordless cycle on five or more vertices (also called hole) and no complement of such a cycle (also called antihole). Equivalently, we can define weakly triangulated graphs as antihole-free graphs whose induced cycles are isomorphic either to C
Bondy and Vince proved that every graph with minimum degree at least three contains two cycles whose lengths differ by one or two, which answers a question raised by Erdo Λs. By a different approach, we show in this paper that if G is a graph with minimum degree d(G) \ 3k for any positive integer k,