Furstenberg sets and Furstenberg schemes over finite fields

Abstract

We give a lower bound for the size of a subset of ${\mathbb{F}}_q^n$ containing a rich k-plane in every direction, a k-plane Furstenberg set. The chief novelty of our method is that we use arguments on non-reduced subschemes and flat families to derive combinatorial facts about incidences between points and k-planes in space.

16 pages

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