2 problems

For an approximation function $\psi:\mathbb{N}\to[0,\infty)$, consider the set of $\psi$-approximable points in dimension one with inhomogeneous parameter $\gamma=0$, with the addi…

Faben–Jerrum's conjecture. Let $H$ be a graph. If its involution-free reduction $H^*$ has at most one vertex, then $\oplus\operatorname{HomsTo}(H)$ is in $\mathrm{P}$; otherwise,…