Year: 2026
Type: preprint
Abstract: Let $z(n)$ be the maximum number of edges in a tripartite $3$-uniform hypergraph with $n$ vertices in each part and no copy of $K_{2,2,2}^{(3)}$ (a ``box''). Erdős (1964) proved that $z(n) = O(n^{11/4})$, whereas the best previous lower bound, due to Katz, Krop, and Maggioni (2002), was $Ω(n^{8/3})$. For each $q = 2^m$, we construct a box-free hypergraph with $q^4$ vertices in each part and $q^{11}$ edges, showing that $z(n) = Θ(n^{11/4})$. The construction uses the power map $τ(s) = s^{q^2-q+1}$ on $\F_{q^3}$, which sends the fibers of $s \mapsto τ(s+1) + τ(s)$ to pairwise skew affine lines over $\F_q$.
Source: arXiv (Cornell University)
Author: Menezes, Dean
Subfield: Discrete Mathematics and Combinatorics
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7214019362
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