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arXiv 0708.4396math.AG
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Grothendieck簇环中某些环面类的计算

The computation of the classes of some tori in the Grothendieck ring of varieties

Karl Rökaeus

摘要:

我们根据Grothendieck簇环的λ结构建立了Grothendieck簇环中某些环面类的公式。更明确地说,我们将看到,如果L* 是n维可分k-代数L中可逆元素的环面,则L* 的类可以表示为L的谱在λ-运算下的像的交替和乘以Lefschetz类的幂。这个公式是从环面的上同调提出的,说明了一种可以用于其他情况的启发式方法。为了证明这个公式,需要在Grothendieck环上进行一些相当明确的计算。为了能够使这些我们介绍一个同态从伯恩赛德环的绝对伽罗瓦群的k,格罗滕迪克环的品种超过k。在这个过程中,我们得到了一些关于零维簇生成的子环的结构信息。

英文摘要:

We establish a formula for the classes of certain tori in the Grothendieck ring of varieties, in terms of its lambda-structure. More explicitly, we will see that if L* is the torus of invertible elements in the n-dimensional separable k-algebra L, then the class of L* can be expressed as an alternating sum of the images of the spectrum of L under the lambda-operations, multiplied by powers of the Lefschetz class. This formula is suggested from the cohomology of the torus, illustrating a heuristic method that can be used in other situations. To prove the formula will require some rather explicit calculations in the Grothendieck ring. To be able to make these we introduce a homomorphism from the Burnside ring of the absolute Galois group of k, to the Grothendieck ring of varieties over k. In the process we obtain some information about the structure of the subring generated by zero-dimensional varieties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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