On $r$-cross $t$-intersecting families for weak compositions

Kok Bin Wong, Cheng Yeaw Ku

Let ${\mathbb{N}}_0$ be the set of non-negative integers, and let $P(n,l)$ denote the set of all weak compositions of $n$ with $l$ parts, i.e., $P(n,l)=\{ (x_1,x_2,\dots, x_l)\in\math…