On cross-2-intersecting families

Yanhong Chen, Anshui Li, Biao Wu +1

Two families $\mathcal{A}\subseteq \left(\genfrac{}{}{0ex}{}{[n]}{k}\right)$ and $\mathcal{B}\subseteq \left(\genfrac{}{}{0ex}{}{[n]}{\ell }\right)$ are called cross-$t$-intersecting if $|A\cap B|\ge t$ for all $A\in \mathcal{A}$, $B\in\m…