On the number of a SDRs of a valued (t,n)-family

Dawei He, Changhong Lu

A system of distinct representatives (SDR) of a family $F=(A_1,\cdots ,A_n)$ is a sequence $(x_1,\cdots ,x_n)$ of $n$ distinct elements with $x_i\in A_i$ for $1\le i\le n$.…