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| Format: | Preprint |
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2026
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| Online-Zugang: | https://arxiv.org/abs/2605.06956 |
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| author | Alvarenga, Roberto Lozano, Murillo Salehyan, Parham |
| author_facet | Alvarenga, Roberto Lozano, Murillo Salehyan, Parham |
| contents | The Bourbaki degree of a plane projective curve $F$, denoted by $\mathrm{Bour}(F)$, was introduced in \cite{Marcos} by Jardim, Nejad and Simis. It is defined as the degree of $R/I_ε$, where $R = k[x,y,z]$ is the graded polynomial ring, with $k$ algebraically closed, and $I_ε\subseteq R$ is the Bourbaki ideal associated with a minimal generator $ε$ of the module of first syzygies of the Jacobian ideal $J_F$. In this work, we propose the definition of the local Bourbaki degree at a point $P \in \mathbb{P}^2$, denoted by $\mathrm{Bour}_P(F)$, and prove that $\mathrm{Bour}(F) = \sum_{P \in \mathbb{P}^2}\mathrm{Bour}_P(F).$
Furthermore, we present results that follow from this local definition, which are instrumental in determining the Bourbaki degree and in establishing whether a curve is (nearly) free. In addition, we provide examples of computing the Bourbaki degree via the local formula - an approach that is computationally advantageous, as it, generically, demands fewer calculations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_06956 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The Local Bourbaki Degree of a Plane Projective Curve Alvarenga, Roberto Lozano, Murillo Salehyan, Parham Algebraic Geometry The Bourbaki degree of a plane projective curve $F$, denoted by $\mathrm{Bour}(F)$, was introduced in \cite{Marcos} by Jardim, Nejad and Simis. It is defined as the degree of $R/I_ε$, where $R = k[x,y,z]$ is the graded polynomial ring, with $k$ algebraically closed, and $I_ε\subseteq R$ is the Bourbaki ideal associated with a minimal generator $ε$ of the module of first syzygies of the Jacobian ideal $J_F$. In this work, we propose the definition of the local Bourbaki degree at a point $P \in \mathbb{P}^2$, denoted by $\mathrm{Bour}_P(F)$, and prove that $\mathrm{Bour}(F) = \sum_{P \in \mathbb{P}^2}\mathrm{Bour}_P(F).$ Furthermore, we present results that follow from this local definition, which are instrumental in determining the Bourbaki degree and in establishing whether a curve is (nearly) free. In addition, we provide examples of computing the Bourbaki degree via the local formula - an approach that is computationally advantageous, as it, generically, demands fewer calculations. |
| title | The Local Bourbaki Degree of a Plane Projective Curve |
| topic | Algebraic Geometry |
| url | https://arxiv.org/abs/2605.06956 |