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近环与斜括号

Near-Rings and Skew Braces

Riccardo Aragona, Norberto Gavioli, Martina Iannaccone, Giuseppe Nozzi

arXiv 2608.04874首次发表:更新:

AI 中文总结

本文推广Rump的根基环与括号对应关系,利用近环定义拓扑右斜括号,其乘法群可自然对应Nottingham群等典型群,实现了相关代数结构的拓展应用。

AI 中文摘要

本文将Rump关于根基环与括号的对应关系推广到更一般的情形,利用一类合适的近环。给定带有乘法单位元的右近环(R,+,∘),我们定义一个新运算,该运算生成一个幺半群。在通过滤子表达的自然相容性条件下,这个幺半群成为拓扑群,进而得到拓扑右斜括号。该推广可还原根基环括号,并成功应用于复合映射构成的近环。我们给出若干显式应用,证明Nottingham群、三角函数群、任意群的迭代 wreath 积、自由幂零群的IA-自同构群自然作为这类拓扑斜括号的乘法群出现。

英文摘要

This paper adapts Rump's correspondence between radical rings and braces to a more general setting, utilizing a suitable class of near-rings. Given a right near-ring $(R,+,\circ)$ with a multiplicative identity, we define a new operation that yields a monoid. Under natural compatibility conditions expressed via a filtration, this monoid becomes a topological group, yielding a topological right skew brace. This generalization recovers radical-ring braces and successfully applies to near-rings of maps under composition. We provide several explicit applications, demonstrating that the Nottingham group, groups of triangular functions, iterated wreath products of arbitrary groups, and groups of IA-automorphisms of free nilpotent groups naturally arise as multiplicative groups of such topological skew braces.

论文原文

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