$ K_2$ for the simplest integral group rings and topological applications

$ K_2$ for the simplest integral group rings and topological applications
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DOI:
10.1070/sm2003v194n01abeh000704
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发表时间:
2003-02
影响因子:
0.8
通讯作者:
P. Akhmet’ev
P. Akhmet’ev
中科院分区:
数学3区
文献类型:
--
作者:
P. Akhmet’ev

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我们计算群,其中是一个基本群的群环,系数在域中,是秩为2的最简单的初等阿贝尔群。使用这些计算,我们从下面的值估计,其中是群的整群环。这种计算在伪同位素理论中产生了某些推论,因为该群被证明是不平凡的。在微分拓扑结构进行了讨论,导致计算值的不变量。
We calculate the group , where is the group ring of a fundamental group with coefficients in the field and is the simplest elementary Abelian group of rank 2. Using these calculations we estimate from below the value , where is the integral group ring of the group . This calculation yields certain corollaries in the theory of pseudo-isotopies, since the group turns out to be non-trivial. Constructions in differential topology are discussed that lead to calculations of -valued invariants.