Cyclic relative difference families with block size four and their applications

Chenya Zhao, Binwei Zhao, Yanxun Chang +3

Given a subgroup $H$ of a group $(G,+)$, a $(G,H,k,1)$ difference family (DF) is a set $\mathcal{F}$ of $k$-subsets of $G$ such that $\{f-f':f,f'\in F, f\neq f',F\in \mathcal F\}=G\…