4 problems

Let ${\mathcal A}$ be a simplicial real line arrangement, and call it nontrivially monodromic when its Milnor fiber has nontrivial monodromy. The known arrangements referred to in…

Let ${\mathcal A}$ be a real arrangement, let $F$ be its Milnor fiber, and let monodromy mean the action induced on the homology of $F$. A nontrivial monodromy has prime-power orde…

Let ${\mathcal A}$ be a real affine line arrangement and let $\overline{{\mathcal A}}$ be its projective arrangement. A sharp pair of lines is a pair of projective lines satisfying…

Let ${\mathcal A}$ be a real affine line arrangement, and let $\Gamma({\mathcal A})$ be the graph whose vertices are the lines $H\in{\mathcal A}$, with an edge $(H,H')$ exactly whe…