2 problems

Let $B$ be a non-exceptional Hurwitz biset, and let $B^*$ denote its associated semigroup of elements. An element of $B^*$ is unobstructed if it has no Thurston obstruction. Conver…

Let $\mathcal F$ be a saturated fusion system on a finite $p$-group $S$, let $\Omega=\Lambda_{\mathcal F}$ be its minimal characteristic biset, and let $P\leq S$ and…