Favaron, MahΓ©o, and SaclΓ© proved that the residue of a simple graph G is a lower bound on its independence number Ξ±(G). For k β N, a vertex set X in a graph is called k-independent, if the subgraph induced by X has maximum degree less than k. We prove that a generalization of the residue, the k-resi
k-Bounded classes of dominant-independent perfect graphs
β Scribed by Zverovich, Igor E.
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 253 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0364-9024
No coin nor oath required. For personal study only.
β¦ Synopsis
Let Ξ±(G), Ξ³(G), and i(G) be the independence number, the domination number, and the independent domination number of a graph G, respectively. For any k β₯ 0, we define the following hereditary classes: Ξ±i
where ISub(G) is the set of all induced subgraphs of a graph G. In this article, we present a finite forbidden induced subgraph characterization for Ξ±i(k) and Ξ±Ξ³(k) for any k β₯ 0. We conjecture that iΞ³(k) also has such a characterization. Up to the present, it is known only for iΞ³(0) (domination perfect graphs
π SIMILAR VOLUMES
Let Ξ²(G) and Ξ(G) be the independence number and the upper domination number of a graph G, respectively. A graph G is called Ξ-perfect if Ξ²(H) = Ξ(H), for every induced subgraph H of G. The class of Ξ-perfect graphs generalizes such well-known classes of graphs as strongly perfect graphs, absorbantl
We consider the well-known upper bounds Β΅(G) β€ |V (G)|-β(G), where β(G) denotes the maximum degree of G and Β΅(G) the irredundance, domination or independent domination numbers of G and give necessary and sufficient conditions for equality to hold in each case. We also describe specific classes of gr