Venezuela Ap. 47567, Caracas Favaron, O., P. Mago and 0. Ordaz, On the bipartite independence number of a balanced bipartite graph, Discrete Mathematics 121 (1993) 55-63. The bipartite independence number GI aIp of a bipartite graph G is the maximum order of a balanced independent set of G. Let 6 b
Hamiltonian properties and the bipartite independence number
✍ Scribed by Oscar Ordaz; Denise Amar; André Raspaud
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 412 KB
- Volume
- 161
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
✦ Synopsis
By using the notion of compatibility of subgraphs with a perfect matching developed for digraphs in [1], we show that if, in a balanced bipartite graph G of minimum degree 6, the maximum cardinality ebip of a balanced independent subset satisfies ~bip ~< 26 --4, then G is hamiltonian-biconnected, and if Ctbip ~< 26 --2, G contains a hamiltonian path. Moreover, we give some properties of balanced bipartite graphs which are not hamiltonian, and which satisfy ~bip ~ 26 -2.
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Let G=(V 1 , V 2 ; E ) be a bipartite graph with |V 1 |= |V 2 | =n 2k, where k is a positive integer. Suppose that the minimum degree of G is at least k+1. We show that if n>2k, then G contains k vertex-disjoint cycles. We also show that if n=2k, then G contains k&1 quadrilaterals and a path of orde
## Abstract Given a graph __G__ and an integer __k__ ≥ 1, let α(__G, k__) denote the number of __k__‐independent partitions of __G__. Let 𝒦^−s^(__p,q__) (resp., 𝒦~2~^−s^(__p,q__)) denote the family of connected (resp., 2‐connected) graphs which are obtained from the complete bipartite graph __K~p,q
We prove that in every connected graph the independence number is at least as large as the average distance between vertices. Theorem. For every connected graph G , we have a ( G ) 2 D ( G ) , with equality if and only if G is a complete graph.