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Very Well-Covered Graphs with the Erd\H{o}s-Ko-Rado Property
- Source :
- Involve 16 (2023) 35-47
- Publication Year :
- 2021
-
Abstract
- A family of independent $r$-sets of a graph $G$ is an $r$-star if every set in the family contains some fixed vertex $v$. A graph is $r$-EKR if the maximum size of an intersecting family of independent $r$-sets is the size of an $r$-star. Holroyd and Talbot conjecture that a graph is $r$-EKR as long as $1\leq r\leq\frac{\mu(G)}{2}$, where $\mu(G)$ is the minimum size of a maximal independent set. It is suspected that the smallest counterexample to this conjecture is a well-covered graph. Here we consider the class of very well-covered graphs $G^*$ obtained by appending a single pendant edge to each vertex of $G$. We prove that the pendant complete graph $K_n^*$ is $r$-EKR when $n \geq 2r$ and strictly so when $n>2r$. Pendant path graphs $P_n^*$ are also explored and the vertex whose $r$-star is of maximum size is determined.<br />Comment: 10 pages
- Subjects :
- Mathematics - Combinatorics
05C35
Subjects
Details
- Database :
- arXiv
- Journal :
- Involve 16 (2023) 35-47
- Publication Type :
- Report
- Accession number :
- edsarx.2106.09067
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.2140/involve.2023.16.35