Huneke's conjecture on tight Hilbert coefficients and F-rationality

Let (R,m)(R,\frak{m}) be an excellent Noetherian local ring of characteristic p>0p>0 such that its completion R^\widehat{R} is reduced and satisfies (S2)(S_2). For a parameter ideal QRQ\subseteq R, let e1(Q)e_1^*(Q) denote the first tight Hilbert coefficient. Huneke's conjecture. If

e1(Q)=0e_1^*(Q)=0

for some, and hence for all, parameter ideals QRQ\subseteq R, then RR is FF-rational. The conjecture asks whether vanishing of the first tight Hilbert coefficient characterizes FF-rationality under these hypotheses; the paper's abstract indicates that this implication is proved for Buchsbaum local rings satisfying (S2)(S_2), while the general case remains the question posed by Huneke.

Sources & referencesView supporting material

Primary source

Duong Thi Huong, Nguyen Tuan Long and Pham Hung Quy, “The vanishing of the first tight Hilbert coefficient for Buchsbaum rings”, arXiv:2401.06756 (2025).

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