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arXiv 0903.3428math.LO
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抽象初等类的分类理论

Introduction to: classification theory for abstract elementary class

Saharon Shelah

摘要:

初等类的分类理论处理结构的一阶(初等)类(即,固定一阶句子的集合T,我们用初等子模型的概念研究T的模型类)。它试图找到分界线,证明它们的后果,证明“低端”(特别是稳定和超稳定理论)的“结构定理、正定理”,并证明“高端”的“非结构、复杂性定理”。它从非同构模型的类别和数量开始。它可能被认为是模型论的核心部分,然而,对于非初等类来说,拥有这样的(非平凡的)理论会更好。还要注意的是,代数中考虑的许多结构类不是一阶的;这些类的某些族接近一阶(比如有某种紧性)。但在这里,我们将讨论更一般情况下的分类理论,而不假定一阶情况的知识(在大多数情况下,根本不假定模型论的知识)。本文介绍了即将出版的《抽象初等类的分类理论》一书

英文摘要:

Classification theory of elementary classes deals with first order (elementary) classes of structures (i.e. fixing a set T of first order sentences, we investigate the class of models of T with the elementary submodel notion). It tries to find dividing lines, prove their consequences, prove "structure theorems, positive theorems" on those in the "low side" (in particular stable and superstable theories), and prove "non-structure, complexity theorems" on the "high side". It has started with categoricity and number of non-isomorphic models. It is probably recognized as the central part of model theory, however it will be even better to have such (non-trivial) theory for non-elementary classes. Note also that many classes of structures considered in algebra are not first order; some families of such classes are close to first order (say have kind of compactness). But here we shall deal with a classification theory for the more general case without assuming knowledge of the first order case (and in most parts not assuming knowledge of model theory at all). The present paper includes an introduction to the forthcoming book on Classification Theory for Abstract Elementary Classes

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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