Furstenberg set problem and exceptional set estimate in prime fields: dimension two implies higher dimensions

Abstract

We study Furstenberg set problem, and exceptional set estimate for Marstrand's orthogonal projection in prime fields for all dimensions. We define the Furstenberg index $\mathbf{F}(s,t;n,k)$ and the Marstrand index $\mathbf{M}(a,s;n,k)$. It is shown that the two-dimensional result for Furstenberg set problem implies all higher dimensional results.