For A in F_q^2 with |A| at most p^{4/3}, some point of A determines Ω(|A|^{2/3}) distinct distances, improving the earlier Ω(|A|^{20/37}) bound.
Bisectors and pinned distances
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abstract
We prove, under suitable conditions, a lower bound on the number of pinned distances determined by small subsets of two-dimensional vector spaces over fields. For finite subsets of the Euclidean plane we prove an upper bound for their bisector energy.
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math.CO 1years
2019 1verdicts
CONDITIONAL 1representative citing papers
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Bisector energy and pinned distances in positive characteristic
For A in F_q^2 with |A| at most p^{4/3}, some point of A determines Ω(|A|^{2/3}) distinct distances, improving the earlier Ω(|A|^{20/37}) bound.