On the p3-hull number of kneser graphs

Luciano N. Grippo, Adrián Pastine, Pablo Torres, Mario Valencia-Pabon, Juan C. Vera

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This paper considers an infection spreading in a graph; a vertex gets infected if at least two of its neighbors are infected. The P3-hull number is the minimum size of a vertex set that eventually infects the whole graph. In the specific case of the Kneser graph K(n, k), with n ≥ 2k + 1, an infection spreading on the family of k-sets of an n-set is considered. A set is infected whenever two sets disjoint from it are infected. We compute the exact value of the P3-hull number of K(n, k) for n > 2k + 1. For n = 2k + 1, using graph homomorphisms from the Knesser graph to the Hypercube, we give lower and upper bounds. Mathematics Subject Classifications: 05C76, 52A37, 05C85.
Original languageEnglish
Article numberP3.32
JournalElectronic Journal of Combinatorics
Volume28
Issue number3
DOIs
Publication statusPublished - Jul 2021

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