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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2403.09175 |
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| _version_ | 1866909411036889088 |
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| author | A, Vanmathi Sarkar, Parangama |
| author_facet | A, Vanmathi Sarkar, Parangama |
| contents | We study the asymptotic behaviour of $v$-number and local $v$-numbers of Noetherian generalized symbolic power filtrations $\mathcal I=\{I_n\}$ in a Noetherian $\mathbb N$-graded domain and show that they are quasi-linear type. We provide sufficient conditions for the existence of the limits $\lim\limits_{n\to\infty}\frac{v(I_n)}{n}$ and $\lim\limits_{n\to\infty}\frac{v_\mathfrak p(I_n)}{n}$ for all $\mathfrak p\in\overline A(\mathcal I)$. We explicitly compute local $v$-numbers and $v$-numbers of symbolic powers of cover ideals of complete bipartite graphs, complete graphs, cycles, $K_m^s$ and compare them with their Castelnuovo-Mumford regularity. We give an example of a bipartite graph $\mathcal H$ that is not a complete bipartite graph and $v(J(\mathcal H))>bight(I(\mathcal H))-1$. This answers a question in [25, Question 3.12]. We show that for both connected bipartite graphs and connected non-bipartite graphs, the difference between the regularity and the $v$-number of the cover ideals can be arbitrarily large. This strengthens and gives an alternative proof of[25,Theorem 3.10]. We provide a counterexample to a conjecture [12, Conjecture 5.4] due to A. Ficarra and E. Sgroi. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09175 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | $v$-numbers of symbolic power filtrations A, Vanmathi Sarkar, Parangama Commutative Algebra We study the asymptotic behaviour of $v$-number and local $v$-numbers of Noetherian generalized symbolic power filtrations $\mathcal I=\{I_n\}$ in a Noetherian $\mathbb N$-graded domain and show that they are quasi-linear type. We provide sufficient conditions for the existence of the limits $\lim\limits_{n\to\infty}\frac{v(I_n)}{n}$ and $\lim\limits_{n\to\infty}\frac{v_\mathfrak p(I_n)}{n}$ for all $\mathfrak p\in\overline A(\mathcal I)$. We explicitly compute local $v$-numbers and $v$-numbers of symbolic powers of cover ideals of complete bipartite graphs, complete graphs, cycles, $K_m^s$ and compare them with their Castelnuovo-Mumford regularity. We give an example of a bipartite graph $\mathcal H$ that is not a complete bipartite graph and $v(J(\mathcal H))>bight(I(\mathcal H))-1$. This answers a question in [25, Question 3.12]. We show that for both connected bipartite graphs and connected non-bipartite graphs, the difference between the regularity and the $v$-number of the cover ideals can be arbitrarily large. This strengthens and gives an alternative proof of[25,Theorem 3.10]. We provide a counterexample to a conjecture [12, Conjecture 5.4] due to A. Ficarra and E. Sgroi. |
| title | $v$-numbers of symbolic power filtrations |
| topic | Commutative Algebra |
| url | https://arxiv.org/abs/2403.09175 |