arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0901.4092math.FAmath.LO
收藏

关于可分巴拿赫空间间一致同胚关系的复杂性

On the complexity of the uniform homeomorphism relation between separable Banach spaces

Su Gao, Steve Jackson, Bünyamin Sari

摘要:

在解析等价关系的Borel约化层次中,考虑了可分巴拿赫空间之间一致同胚关系的复杂性的判定问题.我们证明了完全$K_σ$等价关系是Borel可约的一致同胚关系,并且我们还确定了该关系在某些小类巴拿赫空间上的可能复杂性.此外,我们确定了巴拿赫空间之间的局部等价关系的精确复杂性,即它是用$K_σ$双可约的。最后,我们构造了一类相互一致同胚的巴拿赫空间,使得实数可数集的相等关系可Borel约化为该类上的同构关系.

英文摘要:

We consider the problem of determining the complexity of the uniform homeomorphism relation between separable Banach spaces in the Borel reducibility hierarchy of analytic equivalence relations. We prove that the complete $K_σ$ equivalence relation is Borel reducible to the uniform homeomorphism relation, and we also determine the possible complexities of the relation when restricted to some small classes of Banach spaces. Moreover, we determine the exact complexity of the local equivalence relation between Banach spaces, namely that it is bireducible with $K_σ$. Finally, we construct a class of mutually uniformly homeomorphic Banach spaces such that the equality relation of countable sets of real numbers is Borel reducible to the isomorphism relation on the class.

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。

↑