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arXiv 1805.04073math.RAmath.CTmath.GR
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分次代数的范畴与弱等价

Categories and weak equivalences of graded algebras

Alexey Gordienko, Ofir Schnabel

AI总结:

本文研究了分次代数分次弱等价的概念,引入了为每个分次分配支撑的 oplax 2-函子,并证明泛分次群函子既无左伴随也无右伴随。

摘要:

在研究分次代数的结构(如分次理想、分次子空间、根等)或分次多项式恒等式时,分次群本身并不发挥重要作用,而是可以被任何实现相同分次的群所替代。由此我们引入分次弱等价的概念:如果存在分次代数之间的同构,将每个分次分量映射到某个分次分量上,则两个分次是弱等价的。代数上的每个群分次可以与许多不同群 G 的 G-分次弱等价,然而事实证明,其中存在一个被称为该分次的泛群的独特群。在本文中,我们研究与分次弱等价概念相关的范畴和函子。特别地,我们引入了一个 oplax 2-函子,它为每个分次分配其支撑,并证明泛分次群函子既没有左伴随也没有右伴随。

英文摘要:

When one studies the structure (e.g. graded ideals, graded subspaces, radicals, ...) or graded polynomial identities of graded algebras, the grading group itself does not play an important role, but can be replaced by any other group that realizes the same grading. Here we come to the notion of weak equivalence of gradings: two gradings are weakly equivalent if there exists an isomorphism between the graded algebras that maps each graded component onto a graded component. Each group grading on an algebra can be weakly equivalent to G-gradings for many different groups G, however it turns out that there is one distinguished group among them called the universal group of the grading. In this paper we study categories and functors related to the notion of weak equivalence of gradings. In particular, we introduce an oplax 2-functor that assigns to each grading its support and show that the universal grading group functor has neither left nor right adjoint.

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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