English

On the random version of the Erd\H{o}s matching conjecture

Combinatorics 2018-06-26 v2

Abstract

The Kneser hypergraph KGn,kr{\rm KG}^r_{n,k} is an rr-uniform hypergraph with vertex set consisting of all kk-subsets of {1,,n}\{1,\ldots,n\} and any collection of rr vertices forms an edge if their corresponding kk-sets are pairwise disjoint. The random Kneser hypergraph KGn,kr(p){\rm KG}^r_{n,k}(p) is a spanning subhypergraph of KGn,kr{\rm KG}^r_{n,k} in which each edge of KGn,kr{\rm KG}^r_{n,k} is retained independently of each other with probability pp. The independence number of random subgraphs of KGn,k2{\rm KG}^2_{n,k} was recently addressed in a series of works by Bollob{\'a}s, Narayanan, and Raigorodskii (2016), Balogh, Bollob{\'a}s, and Narayanan (2015), Das and Tran (2016), and Devlin and Kahn (2016). It was proved that the random counterpart of the Erd\H{o}s-Ko-Rado theorem continues to be valid even for very small values of pp. In this paper, generalizing this result, we will investigate the independence number of random Kneser hypergraphs KGn,kr(p){\rm KG}^r_{n,k}(p). Broadly speaking, when kk is much smaller that nn, we will prove that the random analogue of the Erd\H{o}s matching conjecture is true even for extremely small values of pp.

Keywords

Cite

@article{arxiv.1802.09871,
  title  = {On the random version of the Erd\H{o}s matching conjecture},
  author = {Meysam Alishahi and Ali Taherkhani},
  journal= {arXiv preprint arXiv:1802.09871},
  year   = {2018}
}

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11 pages