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Balanced independent sets and colorings of hypergraphs
Abhishek Dhawan · 2023-11-03 · via math.CO updates on arXiv.org

A $k$-uniform hypergraph $H = (V, E)$ is $k$-partite if $V$ can be partitioned into $k$ sets $V_1, \ldots, V_k$ such that every edge in $E$ contains precisely one vertex from each $V_i$. We call such a graph $n$-balanced if $|V_i| = n$ for each $i$. An independent set $I$ in $H$ is balanced if $|I\cap V_i| = |I\cap V_j|$ for each $1 \leq i, j \leq k$, and a coloring is balanced if each color class induces a balanced independent set in $H$. In this paper, we provide a lower bound on the balanced independence number $α_b(H)$ in terms of the average degree $D = |E|/n$, and an upper bound on the balanced chromatic number $χ_b(H)$ in terms of the maximum degree $Δ$. Our results recover those of recent work of Chakraborti for $k = 2$.