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arXiv 1805.02112math.NTmath.AG
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关于代数函数域的本原元与$X_0(N)$模型

On primitive elements of algebraic function fields and models of $X_0(N)$

Iva Kodrnja, Goran Muić

摘要:

本文是我们以前工作的继续,我们研究了从$X_0(N)$,$N \ge 1$到$\mathbb P^2$的映射,这些映射是通过具有相同权的模形式构造的,并且这样的映射是双有理的(见[12])。本文的方法是基于有限可分域扩张中的本原元理论。我们证明,在大多数情况下,所构造的地图是双有理的,我们认为,这样得到的方程的图像在$\mathbb P^2$是最简单的可能。

英文摘要:

This paper is a continuation of our previous works where we study maps from $X_0(N)$, $N \ge 1$, into $\mathbb P^2$ constructed via modular forms of the same weight and criteria that such a map is birational (see [12]). In the present paper our approach is based on the theory of primitive elements in finite separable field extensions. We prove that in most of the cases the constructed maps are birational, and we consider those such that the resulting equation of the image in $\mathbb P^2$ is simplest possible.

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