Borovik-Poizat秩和稳定性
Borovik-Poizat rank and stability
摘要:
由于Borovik和Poizat,有一种公理化的处理群中的Morley秩。这些公理的基础上形成的代数治疗组有限莫利秩这是共同的今天。然而,存在分级结构,即在其上定义Borovik-Poizat分级函数的结构,其不是$\aleph_0$稳定的。Poizat提出的问题之间的关系,这一概念的排名和稳定理论在以下方面:``联合国小组德Borovik est一个结构稳定,alors qu'un univers rangé n' a aucune raison de l 'être. ''.尽管如此,我们表明,排名结构是超稳定的。
英文摘要:
There is an axiomatic treatment of Morley rank in groups, due to Borovik and Poizat. These axioms form the basis of the algebraic treatment of groups of finite Morley rank which is common today. There are, however, ranked structures, i.e. structures on which a Borovik-Poizat rank function is defined, which are not $\aleph_0$-stable. Poizat raised the issue of the relationship between this notion of rank and stability theory in the following terms: ``un groupe de Borovik est une structure stable, alors qu'un univers rangé n'a aucune raison de l'être ...''. Nonetheless, we show that a ranked structure is superstable.
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