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Incidences and pairs of dot products

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arxiv 1509.01072 v2 pith:UY2DVHNT submitted 2015-09-03 math.CO

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keywords alphabetamathbbcdotconnectionincidencespointsquestion
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abstract

Let $\mathbb{F}$ be a field, let $P \subseteq \mathbb{F}^d$ be a finite set of points, and let $\alpha,\beta \in \mathbb{F} \setminus \{0\}$. We study the quantity \[|\Pi_{\alpha, \beta}| = \{(p,q,r) \in P \times P \times P \mid p \cdot q = \alpha, p \cdot r = \beta \}.\] We observe a connection between the question of placing an upper bound on $|\Pi_{\alpha,\beta}|$ and a well-studied question on the number of incidences betwen points and hyperplanes, and use this connection to prove new and strengthened upper bounds on $|\Pi_{\alpha,\beta}|$ in a variety of settings.

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Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A Structural Condition on Point Sets with Few Distinct Dot Products

    math.CO 2025-10 reject novelty 6.0 of 10

    Any point set in the plane with o(n^{3/4}) distinct dot products must contain a line through the origin holding n^{1/2} points whose consecutive distance ratios cluster near 1.

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