The finite-field exceptional-set estimate in the plane

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Let A⊂Fp2A\subset \mathbb{F}_p^2 satisfy

#A=pa.\#A=p^a.

For 0<s<max⁡{1,a}0<s<\max\{1,a\}, let Es(A)E_s(A) be the exceptional set defined for projection to lines, with n=1n=1 and k=1k=1. The finite-field exceptional-set conjecture. Then

#Es(A)≤Cϵ,a,spϵ+max⁡{0,2s−a}.\#E_s(A)\leq C_{\epsilon,a,s}p^{\epsilon+\max\{0,2s-a\}}.

This is the finite-field counterpart of the planar Euclidean projection conjecture and allows an ϵ \epsilon-loss in the exponent. The source does not provide evidence of resolution, so the conjecture remains open.

References

Primary source

Paige Bright and Shengwen Gan, “Exceptional set estimates in finite fields”, arXiv:2302.13193 (2023).

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