Favaron, Mahéo, and Saclé proved that the residue of a simple graph G is a lower bound on its independence number α(G). For k ∈ 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
On the residue of a graph
✍ Scribed by O. Favaron; M. Mahéo; J.-F. Saclé
- Publisher
- John Wiley and Sons
- Year
- 1991
- Tongue
- English
- Weight
- 915 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0364-9024
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✦ Synopsis
Abstract
The residue R of a simple graph G of degree sequence S: d~1~ ⩾ d~2~ ⩾ …︁ ⩾ d~n~ is the number of zeros obtained by the iterative process consisting of deleting the first term d~1~ of S, subtracting 1 from the d~1~ following ones, and sorting down the new sequence. The depth is the number n ‐ R of steps in this algorithm. We prove here some conjectures given by the computer program GRAFFITI, in particular, magnified image.
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