In this article, we consider the following problem: Given a bipartite graph G and a positive integer k, when does G have a 2-factor with exactly k components? We will prove that if , then, for any bipartite graph H = (U 1 , U 2 ; F ) with |U 1 | β€ n, |U 2 | β€ n and β(H) β€ 2, G contains a subgraph i
Proof of a conjecture on cycles in a bipartite graph
β Scribed by Wang, Hong
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 244 KB
- Volume
- 31
- Category
- Article
- ISSN
- 0364-9024
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β¦ Synopsis
It was conjectured in [Wang, to appear in The Australasian Journal of Combinatorics] that, for each integer k β₯ 2, there exists
. This conjecture is also verified for k = 2, 3 in [Wang, to appear; Wang, manuscript]. In this article, we prove this conjecture to be true if n β₯ 3k, i.e., M (k) β€ 3k. We will also show that, if n β₯ 3k, then for any k independent edges e 1 , . . . , e k of G, there exist k vertex-disjoint cycles C 1 , . . . , C k of length at most 6 in G such that e i β E(C i ) for all i β {1, . . . , k}.
π SIMILAR VOLUMES
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Several problems concerning the distribution of cycle lengths in a graph have been proposed by P. ErdΓΆs and colleagues. In this note two variations of the following such question are answered. In a simple graph where every vertex has degree at least three, must there exist two cycles whose lengths d