Decompositions of locally compact contraction groups, series and extensions

Decompositions of locally compact contraction groups, series and extensions
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局部紧收缩群、级数和扩张的分解

DOI:
10.1016/j.jalgebra.2020.11.007
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发表时间:
2021
期刊:
影响因子:
0.9
通讯作者:
G. A. Willis
G. A. Willis
中科院分区:
数学3区
文献类型:
--
作者:
Glöckner;G. A. Willis

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局部紧收缩群是一对 (G, α),其中 G 是局部紧群,α: G→ G 是自同构,使得 α n (x)→ e 逐点为 n→∞。我们证明,局部紧收缩群之间的每一个满射、连续、等变同态都承认一个等变连续全局截面。因此,具有阿贝尔核的局部紧收缩群的扩展可以通过连续等变上同调来描述。对于每个素数 p,我们使用 2-cocycles 构造不可数的成对非同构完全不连通、局部紧收缩群 (G, α),它们是 F p= Z/p Z 上形式洛朗级数域的加性群本身的中心扩展 {0}→ F p ((t))→ G→ F p ((t))→{0}。相比之下,仅存在可数个局部紧缩群(直到同构),它们是挠群和阿贝尔群,如下从阿贝尔局部紧缩群的分类。
A locally compact contraction group is a pair (G, α), where G is a locally compact group and α: G→ G an automorphism such that α n (x)→ e pointwise as n→∞. We show that every surjective, continuous, equivariant homomorphism between locally compact contraction groups admits an equivariant continuous global section. As a consequence, extensions of locally compact contraction groups with abelian kernel can be described by continuous equivariant cohomology. For each prime number p, we use 2-cocycles to construct uncountably many pairwise non-isomorphic totally disconnected, locally compact contraction groups (G, α) which are central extensions {0}→ F p ((t))→ G→ F p ((t))→{0} of the additive group of the field of formal Laurent series over F p= Z/p Z by itself. By contrast, there are only countably many locally compact contraction groups (up to isomorphism) which are torsion groups and abelian, as follows from a classification of the abelian locally compact contraction groups.
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影响因子: 0.7
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