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Generalizations of Joints Problem

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arxiv 1606.08525 v1 pith:HDFN723D submitted 2016-06-28 math.CO

Generalizations of Joints Problem

classification math.CO
keywords jointsnumberalmostboundmathbbplanesproblemsharp
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We generalize the joints problem to sets of varieties and prove almost sharp bound on the number of joints. As a special case, given a set of $N$ $2$-planes in $\mathbb{R}^6$, the number of points at which three $2$-planes intersect and span $\mathbb{R}^6$ is at most $CN^{3/2+\epsilon}$. We also get almost sharp bound on the number of joints with multiplicities. The main tools are polynomial partitioning and induction on dimension.

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