Degree versions of the Erdos-Ko-Rado Theorem and Erdos hypergraph matching conjecture

preprint2016arXivOpen access

Abstract

We use an algebraic method to prove a degree version of the celebrated Erd\H os-Ko-Rado theorem: given n>2kn>2k, every intersecting kk-uniform hypergraph HH on nn vertices contains a vertex that lies on at most (n−2k−2)\binom{n-2}{k-2} edges. This result can be viewed as a special case of the degree version of a well-known conjecture of Erdős on hypergraph matchings. Improving the work of Bollobás, Daykin, and Erd\H os from 1976, we show that given integers n,k,sn, k, s with n≥3k2sn\ge 3k^2 s, every kk-uniform hypergraph HH on nn vertices with minimum vertex degree greater than (n−1k−1)−(n−sk−1)\binom{n-1}{k-1}-\binom{n-s}{k-1} contains ss disjoint edges.

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