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Nagata Conjecture


The Nagata conjecture for plane curves predicts the strict degree-multiplicity inequality

 dsqrt(r)>sum_(i=1)^rm_i

for a nonzero effective complex projective plane curve of degree d>=1 at r>=10 very general distinct points with prescribed nonnegative integer multiplicities m_i no larger than the actual multiplicities. Repeated or reducible components and unequal multiplicities are allowed. Very general means outside a countable union of proper Zariski-closed subsets of the ordered configuration space.

Tevelev (2026) gives an expanded human exposition of a proof attributed to OpenAI. His stated theorem treats the equal-multiplicity case: a degree-d plane curve with multiplicity at least m>=1 at r>=10 very general points satisfies d>msqrt(r). The notes explain the argument rather than claim a new proof. This reference does not by itself verify every companion claim in the original announcement, including the higher-dimensional statements about Seshadri constants.

Bruce (2026, Theorem D) reports a proof of the strict inequality for every r>=10 at very general points of P^2. The argument uses degeneration to a nodal curve and interpolation of Laurent polynomials, giving a tropical reworking of earlier AI-generated arguments.


See also

Algebraic Blow-Up, Nagata-Biran-Szemberg Conjecture, Plane Curve, Seshadri Constant

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References

Bruce, J. "A Tropical Viewpoint on the Nagata-Biran-Szemberg Conjecture." 30 Oct 2026. https://arxiv.org/abs/2610.41931v1.Ciliberto, C.; Harbourne, B.; Miranda, R.; and Roé, J. "Variations on Nagata's Conjecture." In A Celebration of Algebraic Geometry (Ed. B. Hassett, J. McKernan, J. Starr, and R. Vakil). Providence, RI: Amer. Math. Soc., pp. 185-203, 2013. https://www.math.colostate.edu/~miranda/preprints/CHMR130122clayStyle.pdf.Tevelev, J. "On OpenAI's Proof of the Nagata Conjecture." 21 Oct 2026. https://arxiv.org/abs/2610.30050.

Cite this as:

Weisstein, Eric W. "Nagata Conjecture." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/NagataConjecture.html

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