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arXiv 1003.4829math.AG
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一条代数上但不被根有理一致化的新曲线

A New Curve Algebraically but not Rationally Uniformized by Radicals

Gian Pietro Pirola, Cecilia Rizzi, Enrico Schlesinger

摘要:

我们给出了一个新的例子,曲线C代数,但不是理性的,一致化的自由基。这意味着C没有映射到具有可解伽罗瓦群的投影线P^1上,而存在映射到C上的曲线C',并且具有到具有可解伽罗瓦群的投影线P^1的有限态射。我们在亏格为2的一般曲线的第二对称积中构造亏格为9的曲线C。它也是一个不满足Abramovich和Harris的条件S(4,2,9)的亏格9曲线的例子。

英文摘要:

We give a new example of a curve C algebraically, but not rationally, uniformized by radicals. This means that C has no map onto the projective line P^1 with solvable Galois group, while there exists a curve C' that maps onto C and has a finite morphism to P^1 with solvable Galois group. We construct such a curve C of genus 9 in the second symmetric product of a general curve of genus 2. It is also an example of a genus 9 curve that does not satisfy condition S(4,2,9) of Abramovich and Harris.

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