Tropical linear series and matroids
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912569948635136 |
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| author | Chang, Chih-Wei Dupraz, Matthew Iriarte, Hernan Jensen, David Karp, Dagan Payne, Sam Wang, Jidong |
| author_facet | Chang, Chih-Wei Dupraz, Matthew Iriarte, Hernan Jensen, David Karp, Dagan Payne, Sam Wang, Jidong |
| contents | We study a notion of tropical linear series on metric graphs that combines two essential properties of tropicalizations of linear series on algebraic curves: the Baker-Norine rank and the independence rank. Our main results relate the local and global geometry of these tropical linear series to the combinatorial geometry of matroids and valuated matroids, respectively. As an application, we characterize exactly when the tropicalization of the canonical linear series on a single curve is equal to the locus of realizable tropical canonical divisors determined by Möller, Ulirsch, and Werner. We also illustrate our results with a wealth of examples; in particular, we show that the Bergman fan of every matroid appears as the local fan of a tropical linear series on a metric graph. The paper concludes with a list of ten open questions for future investigation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20062 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Tropical linear series and matroids Chang, Chih-Wei Dupraz, Matthew Iriarte, Hernan Jensen, David Karp, Dagan Payne, Sam Wang, Jidong Algebraic Geometry Combinatorics 14T05 We study a notion of tropical linear series on metric graphs that combines two essential properties of tropicalizations of linear series on algebraic curves: the Baker-Norine rank and the independence rank. Our main results relate the local and global geometry of these tropical linear series to the combinatorial geometry of matroids and valuated matroids, respectively. As an application, we characterize exactly when the tropicalization of the canonical linear series on a single curve is equal to the locus of realizable tropical canonical divisors determined by Möller, Ulirsch, and Werner. We also illustrate our results with a wealth of examples; in particular, we show that the Bergman fan of every matroid appears as the local fan of a tropical linear series on a metric graph. The paper concludes with a list of ten open questions for future investigation. |
| title | Tropical linear series and matroids |
| topic | Algebraic Geometry Combinatorics 14T05 |
| url | https://arxiv.org/abs/2508.20062 |