On the colorability of bi-hypergraphs

Meiqiao Zhang, Fengming Dong, Ruixue Zhang

A {\it mixed hypergraph} $\mathcal{H}=(\mathcal{V},\mathcal{C},\mathcal{D})$ consists of the vertex set $\mathcal{V}$ and two families of subsets of $2^{\mathcal{V}}$: the family $\mathcal{C}$ of co-edge…