The separator-based derivations for arrangements of monomial groups

Abstract: We investigate derivation modules of hyperplane arrangements associated with the monomial groups $G(r,p,\ell)$. Motivated by Mühlherr's separator-based construction for graphic arrangements, we extend this approach by combining separators with integral expressions. For a subarrangement $\mathcal{A}<em>G$ defined by a graph $G$, we show that, when $p&lt;r$, the derivation module $\mathcal{D}(\mathcal{A}_G)$ is generated by the standard derivations $η_0,\dots,η</em>{κ(G)}$ together with a finite set of separator-based derivations. This result generalizes the complete graph case and provides new evidence toward the broader applicability of separator methods in the study of hyperplane arrangements.