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arXiv 2005.08564math.GTmath.GRmath.QA
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Quandle上同调,扩张与自同构

Quandle cohomology, extensions and automorphisms

Valeriy Bardakov, Mahender Singh

摘要:

本文建立了quandles的上同调、扩张和自同构之间的新关系。我们得到了一个四项正合序列,它涉及quandle的交换扩张的quandle 1-上圈,第二quandle上同调和某些自同构群。还建立了这个序列的一个非交换的对应的动力上同调类,并给出了它在quandle自同构提升中的一些应用。将群的共轭、群的核和群的广义Alexander quandle构造为quandle范畴到群范畴的某个适当函子的伴随函子,证明了这些函子将群的扩张映射为quandle的扩张.最后,我们构造了从群的第二上同调到其核的第二上同调的自然群同态和共轭quandles。

英文摘要:

The paper establishes new relationship between cohomology, extensions and automorphisms of quandles. We derive a four term exact sequence relating quandle 1-cocycles, second quandle cohomology and certain group of automorphisms of an abelian extension of quandles. A non-abelian counterpart of this sequence involving dynamical cohomology classes is also established, and some applications to lifting of quandle automorphisms are given. Viewing the construction of the conjugation, the core and the generalised Alexander quandle of a group as an adjoint functor of some appropriate functor from the category of quandles to the category of groups, we prove that these functors map extensions of groups to extensions of quandles. Finally, we construct some natural group homomorphisms from the second cohomology of a group to the second cohomology of its core and conjugation quandles.

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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