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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2505.23274 |
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| _version_ | 1866908384223035392 |
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| author | Zhang, Huachao Zhao, Chang-An |
| author_facet | Zhang, Huachao Zhao, Chang-An |
| contents | For a Kummer extension defined by the affine equation $y^{m}=\prod_{i=1}^{r} (x-\a_i)^{λ_i}$ over
an algebraic extension $K$ of a finite field $\fq$, where $\la_i\in \Z\backslash\{0\}$ for $1\leq i\leq r$, $\gcd(m,q) = 1$, and $\a_1,\cdots,\a_r\in K$ are pairwise distinct elements,
we propose a simple and efficient method to find all pure gaps at many totally ramified places.
We introduce a bottom set of pure gaps and indicate that the set of pure gaps is completely determined by the bottom set.
Furthermore, we demonstrate that a pure gap can be deduced from a known pure gap by easily verifying only one inequality.
Then, in the case where $λ_1 = λ_2 = \cdots = λ_r$, we fully determine an explicit description of the set of pure gaps at many totally ramified places,
This includes the scenario in which the set of these places contains the infinite place.
Finally, we apply these results to construct multi-point algebraic geometry codes with good parameters.
As one of the examples, a presented code with parameters $[74, 60, \geq 10]$ over $\mathbb{F}_{25}$ yields a new record. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_23274 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pure Gaps at Many Places and Multi-point AG Codes from Arbitrary Kummer Extensions Zhang, Huachao Zhao, Chang-An Information Theory For a Kummer extension defined by the affine equation $y^{m}=\prod_{i=1}^{r} (x-\a_i)^{λ_i}$ over an algebraic extension $K$ of a finite field $\fq$, where $\la_i\in \Z\backslash\{0\}$ for $1\leq i\leq r$, $\gcd(m,q) = 1$, and $\a_1,\cdots,\a_r\in K$ are pairwise distinct elements, we propose a simple and efficient method to find all pure gaps at many totally ramified places. We introduce a bottom set of pure gaps and indicate that the set of pure gaps is completely determined by the bottom set. Furthermore, we demonstrate that a pure gap can be deduced from a known pure gap by easily verifying only one inequality. Then, in the case where $λ_1 = λ_2 = \cdots = λ_r$, we fully determine an explicit description of the set of pure gaps at many totally ramified places, This includes the scenario in which the set of these places contains the infinite place. Finally, we apply these results to construct multi-point algebraic geometry codes with good parameters. As one of the examples, a presented code with parameters $[74, 60, \geq 10]$ over $\mathbb{F}_{25}$ yields a new record. |
| title | Pure Gaps at Many Places and Multi-point AG Codes from Arbitrary Kummer Extensions |
| topic | Information Theory |
| url | https://arxiv.org/abs/2505.23274 |