Farnik–Szemberg–Szpond–Tutaj-Gasinska conjecture on Seshadri constants

Let XX be a surface with Picard group ZH\mathbb{Z}H, where HH is an ample divisor and H2H^2 is not a perfect square. Let (q,p)(q,p) be a primitive solution of

p2H2q2=1.p^2-H^2q^2=1.

For a point xXx\in X, let ε(H,x)\varepsilon(H,x) denote the Seshadri constant of HH at xx, and set

ε(H,1)=maxxXε(H,x).\varepsilon(H,1)=\max_{x\in X}\varepsilon(H,x).

Farnik–Szemberg–Szpond–Tutaj-Gasinska conjecture. One has

ε(H,1)qpH2.\varepsilon(H,1)\geq\frac{q}{p}H^2.

This conjecture concerns lower bounds for Seshadri constants on surfaces of Picard rank one. The supplied context gives no evidence of a resolution, so its status remains open.

Sources & referencesView supporting material

Primary source

Jonas Baltes, “Hilbert Schemes and Seshadri Constants”, arXiv:2409.09694 (2024).

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