Supersolvability and Freeness for $\psi$-graphical Arrangements

Lili Mu, Richard P. Stanley

Let $G$ be a simple graph on the vertex set $\{v_1,\dots ,v_n\}$ with edge set $E$. Let $K$ be a field. The graphical arrangement ${\mathcal{A}}_G$ in $K^n$ is the arrangement $x_i-x_…