2 problems

Solomon–Terao order-degree conjecture. If $\eta\in U_{d+1}({\mathcal{A}})$, then $ST_{d+1}({\mathcal{A}};x)$ is monic of degree

Let ${\mathcal{A}}$ be a hyperplane arrangement in a vector space of dimension $\ell$, and let $\Psi({\mathcal{A}};x,t)$ denote its Solomon–Terao polynomial. A polynomial is palind…