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Amir Mafi

Amir Mafi

Academic rank: Professor
ORCID:
Education: PhD.
ScopusId: 14627657300
HIndex:
Faculty: Faculty of Science
Address:
Phone: 33624133

Research

Title
On the first generalized Hilbert coefficient and depth of associated graded rings
Type
JournalPaper
Keywords
Generalized Hilbert coefficient, minimal reduction, associated graded ring
Year
2020
Journal Bulletin of the Korean Mathematical Society
DOI
Researchers Amir Mafi ، Dler Naderi

Abstract

‎Let $(R,\frak{m})$ be a $d$-dimensional Cohen-Macaulay local ring with infinite residue field‎. ‎Let $I$ be an ideal of $R$ that has analytic spread $\ell(I)=d$‎, ‎satisfies the $G_d$ condition‎, ‎the weak Artin-Nagata property $AN_{d-2}^-$ and $\frak{m}$ is not an associated prime of $R/I$‎. ‎In this paper‎, ‎we show that if $j_1(I) = \lambda (I/J)‎ +‎\lambda [R/(J_{d-1}‎ :‎_{R} I+(J_{d-2}‎ :‎_{R}I+I)‎ ‎:_{R}{\frak{m}}^{\infty})]+1$,‎ ‎then $I$ has almost minimal $j$-multiplicity‎, ‎$G(I)$ is Cohen-Macaulay and $r_J(I)$ is at most 2‎, ‎where $J=(x_1‎, . . . ,‎x_d)$ is a general minimal reduction of $I$ and $J_i=(x_1‎, . . . ‎,x_i)$.‎ ‎In addition‎, ‎the last theorem is in the spirit of a result of Sally who has studied the depth of associated graded rings and minimal reductions for an $\frak{m}$-primary ideals‎.