Quasi-Hilbert rings and Ratliff-Rush filtrations
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| Format: | Preprint |
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2025
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| _version_ | 1866917168943202304 |
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| author | Puthenpurakal, Tony J. Sahoo, Samarendra |
| author_facet | Puthenpurakal, Tony J. Sahoo, Samarendra |
| contents | Let $A$ be a non Gorenstein Cohen Macaulay ring of dimension $d\geq 1$, $I$ an ideal of $A$, and suppose $ω_A$ is a canonical $A$-module. Set $$r(I,ω_A) = \bigcup_{n \geq 0} (I^{n+1} ω_A : I^{n} ω_A) \subseteq A .$$ We show that the ideal $r(I,-)$ is $ω_A$ invariant. Motivated by this property, we introduce a new class of rings, which we call quasi Hilbert rings. We provide several examples of quasi Hilbert rings and discuss a number of their applications. Let $A$ be a local ring with maximal ideal $\mathfrak{m}$. We prove that $A$ is quasi Hilbert iff $\widehat{A}$ is quasi Hilbert, where $\widehat{A}$ is the completion of $A$ w.r.t. $\mathfrak{m}.$ If $d\geq 2$ and $x\in \mathfrak{m}\setminus \mathfrak{m}^2$ is an $A\bigoplus ω_A$ superficial element, we prove that if $A$ is quasi Hilbert, then so is $A/(x)$. Writing $\widetilde{I}$ for the Ratliff Rush closure of an ideal $I$, we also provide sufficient conditions ensuring the vanishing of $r(I^n,ω_A)/\widetilde{I^n}$ for all $n\geq 1.$ |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_21168 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quasi-Hilbert rings and Ratliff-Rush filtrations Puthenpurakal, Tony J. Sahoo, Samarendra Commutative Algebra Primary 13A30, 13C14, Secondary 13A02, 13D40, 13D45 Let $A$ be a non Gorenstein Cohen Macaulay ring of dimension $d\geq 1$, $I$ an ideal of $A$, and suppose $ω_A$ is a canonical $A$-module. Set $$r(I,ω_A) = \bigcup_{n \geq 0} (I^{n+1} ω_A : I^{n} ω_A) \subseteq A .$$ We show that the ideal $r(I,-)$ is $ω_A$ invariant. Motivated by this property, we introduce a new class of rings, which we call quasi Hilbert rings. We provide several examples of quasi Hilbert rings and discuss a number of their applications. Let $A$ be a local ring with maximal ideal $\mathfrak{m}$. We prove that $A$ is quasi Hilbert iff $\widehat{A}$ is quasi Hilbert, where $\widehat{A}$ is the completion of $A$ w.r.t. $\mathfrak{m}.$ If $d\geq 2$ and $x\in \mathfrak{m}\setminus \mathfrak{m}^2$ is an $A\bigoplus ω_A$ superficial element, we prove that if $A$ is quasi Hilbert, then so is $A/(x)$. Writing $\widetilde{I}$ for the Ratliff Rush closure of an ideal $I$, we also provide sufficient conditions ensuring the vanishing of $r(I^n,ω_A)/\widetilde{I^n}$ for all $n\geq 1.$ |
| title | Quasi-Hilbert rings and Ratliff-Rush filtrations |
| topic | Commutative Algebra Primary 13A30, 13C14, Secondary 13A02, 13D40, 13D45 |
| url | https://arxiv.org/abs/2512.21168 |