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On fiber cones of ${\mathfrak m}$-primary ideals

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A. V. Jayanthan, Tony J. Puthenpurakal, J. K. Verma

Commutative Algebra · Submitted 25 Aug 2004

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Two formulas for the multiplicity of the fiber cone $F(I)=\oplus_{n=0}^{\infty} I^n/\m I^n$ of an $\m$-primary ideal of a $d$-dimensional Cohen-Macaulay local ring $(R,\m)$ are derived in terms of the mixed multiplicity $e_{d-1}(\m | I),$ the multiplicity $e(I)$ and superficial elements.

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arXiv IDmath/0408346 (version 2)
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CitationA. V. Jayanthan, J. K. Verma, Tony J. Puthenpurakal. "On fiber cones of ${\mathfrak m}$-primary ideals." arXiv:math/0408346 (2004). https://pith.science/paper/XXEI4MDC
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arXiv listing abstract v2. Results and the main claim are underlined; .

Two formulas for the multiplicity of the fiber cone $F(I)=\oplus_{n=0}^{\infty} I^n/\m I^n$ of an $\m$-primary ideal of a $d$-dimensional Cohen-Macaulay local ring $(R,\m)$ are derived in terms of the mixed multiplicity $e_{d-1}(\m | I),$ the multiplicity $e(I)$ and superficial elements. As a consequence, the Cohen-Macaulay property of $F(I)$ when $I$ has minimal mixed multiplicity or almost minimal mixed multiplicity is characterized in terms of reduction number of $I$ and lengths of certain ideals. We also characterize Cohen-Macaulay and Gorenstein property of fiber cones of $\m$-primary ideals with a $d$-generated minimal reduction $J$ satisfying (i) $\ell(I^2/JI)=1$ or (ii) $\ell(I\m/J\m)=1.$

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#sentencerolethe authors' own workstates the main conclusionstrength
s0 Two formulas for the multiplicity of the fiber cone $F(I)=\oplus_{n=0}^{\infty} I^n/\m I^n$ of an $\m$-primary ideal of a $d$-dimensional Cohen-Macaulay local ring $(R,\m)$ are derived in terms of the mixed multiplicity $e_{d-1}(\m | I),$ the multiplicity $e(I)$ and superficial elements. result 0.76 0.95 0.50 asserted 1.00
s1 As a consequence, the Cohen-Macaulay property of $F(I)$ when $I$ has minimal mixed multiplicity or almost minimal mixed multiplicity is characterized in terms of reduction number of $I$ and lengths of certain ideals. result 0.92 0.92 0.25 asserted 1.00
s2 We also characterize Cohen-Macaulay and Gorenstein property of fiber cones of $\m$-primary ideals with a $d$-generated minimal reduction $J$ satisfying (i) $\ell(I^2/JI)=1$ or (ii) $\ell(I\m/J\m)=1.$ result 0.82 0.93 0.21 asserted 1.00

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Original abstract

Two formulas for the multiplicity of the fiber cone $F(I)=\oplus_{n=0}^{\infty} I^n/\m I^n$ of an $\m$-primary ideal of a $d$-dimensional Cohen-Macaulay local ring $(R,\m)$ are derived in terms of the mixed multiplicity $e_{d-1}(\m | I),$ the multiplicity $e(I)$ and superficial elements. As a consequence, the Cohen-Macaulay property of $F(I)$ when $I$ has minimal mixed multiplicity or almost minimal mixed multiplicity is characterized in terms of reduction number of $I$ and lengths of certain ideals. We also characterize Cohen-Macaulay and Gorenstein property of fiber cones of $\m$-primary ideals with a $d$-generated minimal reduction $J$ satisfying (i) $\ell(I^2/JI)=1$ or (ii) $\ell(I\m/J\m)=1.$

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