Erdős--Ko--Rado theorems in ${\ell }_2$-norm for three finite spaces

Qian Bao, Yaojun Chen, Yanbo Zhang

Let $\mathcal{F}$ be a $k$-uniform hypergraph. The famous Erdős--Ko--Rado (1961) theorem determines the maximum size and extremal structure for $\mathcal{F}$ being $t$-intersectin…