Nagata's Kähler packing conjecture for blow-ups of the projective plane

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Let σ:X→CP2\sigma:X\to\mathbb{CP}^2 be the blow-up at points x1,…,xkx_1,\ldots,x_k, with ll the Poincaré dual of a line and eqe_q the Poincaré duals of the exceptional divisors. For k≥9k\geq 9, Nagata's Kähler conjecture. If the points x1,…,xkx_1,\ldots,x_k are chosen sufficiently general, then for every ϵ<1k\epsilon<\frac{1}{\sqrt{k}} there is a Kähler form representing the cohomology class

σ∗l−ϵ∑q=1keq.\sigma^*l-\epsilon\sum_{q=1}^k e_q.

This is the Kähler formulation of Nagata's conjecture, arising from symplectic packing problems for the projective plane. Its relation to the algebraic-geometric inequality in the second candidate makes the two statements equivalent formulations rather than distinct conjectures.

References

Primary source

Thomas Eckl, “Kähler packings and Seshadri constants on projective complex surfaces”, arXiv:1409.3664 (2016).

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