Weierstrass semigroups at totally ramified places of degree one on generalized Kummer extensions
Year: 2026
Type: preprint
Abstract: We explicitly describe the set of gaps and the Weierstrass semigroup at a totally ramified place of degree one on a generalized Kummer extension defined by the affine equation $y^m = f(x)$ over $K$, an algebraic extension of $\mathbb{F}_q$, where $f(x)\in K(x)$ and $K$ is not required to contain a primitive $m$-th root of unity. For the different totally ramified places of degree one, our description takes a unified form. Then we provide a necessary and sufficient condition for the Weierstrass semigroup at a totally ramified place of degree one to be symmetric. Furthermore, we investigate the minimal generating set of the Weierstrass semigroups at many totally ramified places of degree one. We not only explicitly describe the minimal generating set, but also provide functions whose coefficients of pole divisors lie in the minimal generating set. Finally, we apply our results to generalized Kummer extensions with the same multiplicities, as well as function fields of GGS curves and subcovers of the BM curve.
Source: arXiv (Cornell University)
Authors: Zhang, Huachao, Zhao, Chang-An
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Award: G7532033765
OpenAlex ID: W7161293591