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arXiv 1901.03070math.GR
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关于扩张Schur乘子的两个群函子

On two group functors extending Schur multipliers

Heiko Dietrich, Primoz Moravec

摘要:

Liedtke(2008)引入了群函子$K$和$\tilde K$,它们用于描述复代数曲面的某些不变量。他证明,这些函子是连接到理论的中心扩展和舒尔乘数。在这项工作中,我们涉及$K$和$\tilde K$的一个组函子$τ$中产生的建设的非阿贝尔外部广场的一组。与$\tilde K$相比,存在构造$τ$的有效算法,特别是对于多环群。在计算机代数系统GAP的支持下,我们研究了$K(G,3)$何时是$τ(G)$的商,以及$τ(G)$和$\tilde K(G,3)$何时同构。

英文摘要:

Liedtke (2008) has introduced group functors $K$ and $\tilde K$, which are used in the context of describing certain invariants for complex algebraic surfaces. He proved that these functors are connected to the theory of central extensions and Schur multipliers. In this work we relate $K$ and $\tilde K$ to a group functor $τ$ arising in the construction of the non-abelian exterior square of a group. In contrast to $\tilde K$, there exist efficient algorithms for constructing $τ$, especially for polycyclic groups. Supported by computations with the computer algebra system GAP, we investigate when $K(G,3)$ is a quotient of $τ(G)$, and when $τ(G)$ and $\tilde K(G,3)$ are isomorphic.

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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