WEIERSTRASS POINTS WITH FIRST TWO NON-GAPS EQUAL TO n AND n + 2

WEIERSTRASS POINTS WITH FIRST TWO NON-GAPS EQUAL TO n AND n + 2
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前两个非间隙等于 n 和 n 2 的 Weierstrass 点

DOI:
10.2206/kyushujm.68.139
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发表时间:
2014
影响因子:
0.4
通讯作者:
Takaomi Kato
Takaomi Kato
中科院分区:
数学4区
文献类型:
--
作者:
M. Coppens;Takaomi Kato

文献摘要

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我们研究平滑曲线 C 上的 Weierstrass 点,其前两个非间隙等于 n 和 n + 2。如果 C 的亏格 g 满足 g > [(n2 − 1)/2],则已知 C 是曲线的两片覆盖。在本文中,我们主要关注点 P ∈ C 使得 |nP |是一支基点自由铅笔且 |(n + 2)P |是一个无基点的简单网络,因此必然 g ≤ [(n2 − 1)/2],并研究 C 上此类 Weierstrass 点的数量界限。
We study Weierstrass points on a smooth curve C whose first two non-gaps equal n and n + 2. If the genus g of C satisfies g > [(n2 − 1)/2], then it is known that C is a two-sheeted covering of a curve. In this paper, we mainly concentrate on a point P ∈ C such that |nP | is a base point free pencil and |(n + 2)P | is a base point free simple net, whence necessarily g ≤ [(n2 − 1)/2], and study bounds for numbers of such Weierstrass points on C.