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arXiv 0808.0108math.QAmath.GT
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Yang-Baxter变形与Rack上同调

Yang-Baxter deformations and rack cohomology

Michael Eisermann

摘要:

每个机架$Q$提供杨-巴克斯特方程的集合论解$c_Q$。本文研究了环$\A$上Yang-Baxter算子空间中的$c_Q$的形变理论,这是Freyd和Yetter于1989年提出的一个问题.作为我们的主要结果,我们分类变形的模块化的情况下,以前一直留在悬念,并建立$c_Q$的每一个变形是规范等效的准对角。非正式地说,在准对角变形中,只有行为等效的元素相互作用。在极端的情况下,当$Q$的所有元素在行为上都是不同的,杨-巴克斯特上同调因此坍缩到它的对角部分,我们将其识别为rack上同调。后者已被深入研究,近年来,在模块化的情况下,是已知的生产非平凡的和拓扑有趣的杨巴克斯特变形。

英文摘要:

Every rack $Q$ provides a set-theoretic solution $c_Q$ of the Yang-Baxter equation. This article examines the deformation theory of $c_Q$ within the space of Yang-Baxter operators over a ring $\A$, a problem initiated by Freyd and Yetter in 1989. As our main result we classify deformations in the modular case, which had previously been left in suspense, and establish that every deformation of $c_Q$ is gauge-equivalent to a quasi-diagonal one. Stated informally, in a quasi-diagonal deformation only behaviourally equivalent elements interact. In the extreme case, where all elements of $Q$ are behaviourally distinct, Yang-Baxter cohomology thus collapses to its diagonal part, which we identify with rack cohomology. The latter has been intensively studied in recent years and, in the modular case, is known to produce non-trivial and topologically interesting Yang-Baxter deformations.

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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