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An application of ramsey’s theorem to groups with homogeneous theory

 

作者: Francis Oger,  

 

期刊: Communications in Algebra  (Taylor Available online 2000)
卷期: Volume 28, issue 6  

页码: 2977-2981

 

ISSN:0092-7872

 

年代: 2000

 

DOI:10.1080/00927870008827003

 

出版商: Gordon and Breach Science Publishers Ltd.

 

数据来源: Taylor

 

摘要:

For any integersn>m≥ 2, we say that a complete theoryTis (m, n)-homogeneous if, for each modelMofT, two n-tuples ⱥ,ƀ inMhave the same type if the corresponding m-tuples from ⱥ and ƀ have the same type. It was conjectured by H. Kikyo that, ifMis an infinite group, with possibly additional structure, then the theory ofMis not (m, n)-homogeneous. We prove a general result on structures with (m, n)-homogeneous theory which implies that, ifMis a counterexample to this conjecture, then there exists an integerhsuch that each abelian subgroup ofMhas at mosthelements. It follows that there exist an integerksuch thatMk= 1, and an integerlsuch that each finite subgroup ofMhas at mostlelements.

 

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