4 problems

Resonance Chen-group formula. For $k\ge 3$,

Graphic LCS formula.

Let $G=([[200~\ell], E)$ be a simple graph on $\ell$ vertices, and let $\mathcal{A}_G^q$ be its $q$-deformation of graphic arrangement. Write $\chi(\mathcal{A}_G^q,t)$ for its char…

Gentle graphic-arrangement conjecture. A graphic arrangement $\mathcal{A}(G)$ is gentle if and only if $G_{\mathrm{oct}}$ cannot be obtained from $G$ by a series of edge contractio…