Complete Characterization on Maximum Pairwise Cross Intersecting Families (I)

Yang Huang, Yuejian Peng

The families $\mathcal{A}$ and $\mathcal{B}$ are cross intersecting if $A\cap B\ne \varnothing$ for any $A\in \mathcal{A}$ and $B\in \mathcal{B}$. Let $t\ge 2$ and $k_1\geq k_2\geq…