Nagata–Biran conjecture that if X is a smooth algebraic surface and L is an ample line bundle on X of degree d, then for sufficiently large…
Nagata–Biran conjecture that if X is a smooth algebraic surface and L is an ample line bundle on X of degree d, then for sufficiently large r, the Seshadri constant satisfies \varepsilon(p_1,\ldots,p_r;X,L) = d/\sqrt{r}.
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Source: List of unsolved problems in mathematics (CC BY-SA 4.0)