2 problems

Let $m>3$, and consider the voltage group $\mathbb Z_m$. For parameters $a,b$, define the two parameter sets $F_1(m;a,b)$ and $F_2(m;a,b)$ by … for $a\geq b$ and…

A self-dual geometric configuration is a geometric configuration equipped with a duality mapping its points and lines to one another; its rank is the order of the self-duality. Grü…