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arXiv 2102.03181math.CT
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关于范畴的自同构

On automorphisms of categories

Grigori Zhitomirski

摘要:

设V是某种类型的代数簇。B. G.普洛特金在这个问题上有很多成果。B. Plotkin和作者(B。Plotkin,G. Zhitomirski,On automorphisms of categories of自由代数of some varieties,J. Algebra 306(2)(2006)344-367).其方法是在一个给定的簇的语言中找出所有确定这样的V-代数的项,这些V-代数同构于一个给定的C-代数并且与它有相同的底层集,但这个方法只能应用于使所有对象同构的自同构。本文的目的是提出另一种方法,是从上述限制自由。该方法基于两个主要定理。设C是一个范畴,它被赋予一个集范畴的忠实代表函子.定理1利用拟内自同构的新概念,给出了C的自同构的一般描述。定理5给出了如何得到自由V-代数范畴的自同构的完整刻画。调查结束时有两个例子。其中第一个显示了我们的方法在已知情况下的偏好(所有半群的品种)和第二个演示获得新的结果(所有模的品种在任意环的单位和后果的环没有零因子)。

英文摘要:

Let V be a variety of algebras of some type. An interest to describing automorphisms of the category C of finitely generated free V-algebras was inspired in connection with development of universal algebraic geometry founded by B. Plotkin. There are a lot of results on this subject. A common method of getting such results was suggested and applied by B. Plotkin and the author (B. Plotkin , G. Zhitomirski, On automorphisms of categories of free algebras of some varieties, J. Algebra 306(2) (2006) 344-367). The method is to find all terms in the language of a given variety which determine such V-algebras that are isomorphic to a given C-algebra and have the same underlying set with it. But this method can be applied only to automorphisms which take all objects to isomorphic ones. The aim of the present paper is to suggest another method that is free from the mentioned restriction. This method is based on two main theorems. Let C be a category supplied with a faithful representative functor to the category of sets. Theorem 1 gives a general description of automorphisms of C, using a new notion of a quasi-inner automorphism. Theorem 5 shows how to obtain the full description of automorphisms of the category of finitely generated free V-algebras. The investigation ends with two examples. The first of them shows the preference of our method in a known situation (the variety of all semigroups) and the second one demonstrates obtaining new results (the variety of all modules over arbitrary ring with unit and the consequence for the rings without zero divisors).

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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