Poncelet polygon density conjecture for pairs of conics

Let FbbFqFbbF_q be a finite field of characteristic greater than 33, and let nn be an integer coprime to qq. Let Γn\Gamma_n denote the set of ordered pairs of smooth conics satisfying the Poncelet nn-gon condition, and let Ψ\Psi denote the space of ordered pairs of smooth conics. For an integer nn, write d(n)d'(n) for the number of divisors of nn other than 11 and 22.

Poncelet polygon density conjecture. The density satisfies

ΓnΨ=d(n)q+O(q3/2).\frac{|\Gamma_n|}{|\Psi|}=\frac{d'(n)}{q}+O(q^{-3/2}).

This conjecture extends the proved odd-nn asymptotic to even integers, including a corrected version of Chipalkatti's tetragon conjecture. The preceding results establish the corresponding asymptotic for odd nn coprime to qq, while the general case remains open.

Sources & referencesView supporting material

Primary source

Tianhao Wang, “Counting pairs of conics over finite fields that satisfy the Poncelet n-gon condition”, arXiv:2309.16978 (2025).

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