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arXiv 0806.0832math.RA
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Watts定理的推广:模范畴上的右正合函子

A generalization of Watts's Theorem: Right exact functors on module categories

A. Nyman, S. Paul Smith

摘要:

Watts定理指出与直和交换的右正合函子F:Mod R-->Mod S同构于- \otimes_R B,其中B是R-S-双模FR.本文的主要结果是:若A是余完备阿贝尔范畴,F:Mod R --> A是与直和交换的右正合函子,则F同构于- \otimes_R B,其中B是A中的一个合适的R-模,即,由A中的对象B和环同态f组成的对(B,f):R --> Hom_A(B,B)。这一点的一部分是为了给符号- \otimes_R B赋予意义。这是由阿廷和张抽象希尔伯特计划的文件。本文件是他们的文件第一部分中的一些想法的自然扩张。

英文摘要:

Watts's Theorem says that a right exact functor F:Mod R-->Mod S that commutes with direct sums is isomorphic to -\otimes_R B where B is the R-S-bimodule FR. The main result in this paper is the following: if A is a cocomplete abelian category and F:Mod R --> A is a right exact functor commuting with direct sums, then F is isomorphic to - \otimes_R B where B is a suitable R-module in A, i.e., a pair (B,f) consisting of an object B in A and a ring homomorphism f:R --> Hom_A(B,B). Part of the point is to give meaning to the notation -\otimes_R B. That is done in the paper by Artin and Zhang on Abstract Hilbert Schemes. The present paper is a natural extension of some of the ideas in the first part of their paper.

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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