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arXiv 0705.2597math.AGmath.KT
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同调层的Adelic归结

Adelic resolution for homology sheaves

Sergey Gorchinskiy

摘要:

本文对通常的Ideles群进行了推广,即构造了模式上的$K$ -群层的三角复形.更一般地,这样的复形被定义为一个概型上的任意阿贝尔层。我们专注于的情况下,当层是与某些自然公理,满足$K$理论的同调论的预层。在这种情况下,它被证明是adelic复杂提供了一个flasque决议上述层和自然态射的Gersten复杂是一个拟同构。新的adelic决议的主要优点是,它是逆变和乘法相比,Gersten决议。特别是,这允许reprove,在周群的交集重合,以签署与自然产品在相应的$K$ -上同调群。另外,我们证明了在具有一定指数的$K$ -上同调群中,Weil配对可以表示为Massey三重积.

英文摘要:

A generalization of the usual ideles group is proposed, namely, we construct certain adelic complexes for sheaves of $K$-groups on schemes. More generally, such complexes are defined for any abelian sheaf on a scheme. We focus on the case when the sheaf is associated to the presheaf of a homology theory with certain natural axioms, satisfied by $K$-theory. In this case it is proven that the adelic complex provides a flasque resolution for the above sheaf and that the natural morphism to the Gersten complex is a quasiisomorphism. The main advantage of the new adelic resolution is that it is contravariant and multiplicative in contrast to the Gersten resolution. In particular, this allows to reprove that the intersection in Chow groups coincides up to sign with the natural product in the corresponding $K$-cohomology groups. Also, we show that the Weil pairing can be expressed as a Massey triple product in $K$-cohomology groups with certain indices.

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