Hilbert 函数的 Frobenius 扩张、Demailly 猜想与幂的簇
Frobenius dilation of Hilbert function, Demailly's conjecture, and varieties of powers
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- Troy University(特洛伊大学)
- Tulane University(杜兰大学)
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中文总结 AI 辅助
本文通过 Frobenius 扩张不等式和逆系统对偶,证明了 Demailly 猜想,并解决了三元 Waring 问题及幂的簇的非缺陷性。
中文摘要 AI 辅助
我们证明了在特征零中,由固定齐次形式的幂生成的理想的 Hilbert 函数满足一个 Frobenius 扩张不等式。通过 Emsalem--Iarrobino 逆系统对偶,该不等式给出了定量的 fat-point 插值估计,并为 Ha--Sivakumar 最近解决任意有限点集的 Demailly 猜想的定理提供了新的证明。一个固定特征版本控制了幂的簇的切空间,并结合平面插值和割线理论结果,证明了对于所有 $k\ge3$ 和 $d\ge2$,$V^k_{2,d}$ 是完全非缺陷的;特别地,它解决了 Lundqvist--Oneto--Reznick--Shapiro 猜想(由 Ottaviani 提出)的关于一般 $k$-秩的三元 Waring 问题。我们还证明了,对于素数幂指数 $q$,Nicklasson 猜想在三元情形下的任何失败都局限于 $2q-2$ 个连续次数。
英文摘要
We prove a Frobenius-dilation inequality for Hilbert functions of ideals generated by powers of fixed homogeneous forms in characteristic zero. Via Emsalem--Iarrobino inverse system duality, it yields quantitative fat-point postulation estimates and a new proof of the recent theorem of Ha--Sivakumar resolving Demailly's conjecture for arbitrary finite point sets. A fixed-characteristic version controls tangent spaces to varieties of powers and, together with plane interpolation and secant-theoretic results, proves complete nondefectivity of $V^k_{2,d}$ for all $k\ge3$ and $d\ge2$; in particular, it settles the ternary Waring problem for generic $k$-rank conjectured by Lundqvist--Oneto--Reznick--Shapiro (suggested by Ottaviani). We also show that, for a prime power exponent $q$, any failure of Nicklasson's conjecture in three variables is confined to $2q-2$ consecutive degrees.