高复杂性的弱可数决定空间
Weakly countably determined spaces of high complexity
摘要:
证明了存在复杂度高于余解析的弱可数决定空间。另一方面,我们还证明了余分析集可以用存在一个余尾适当闭集族来刻画。因此,由这些族构造的巴拿赫空间至多具有余解析复杂性。
英文摘要:
We prove that there exist weakly countably determined spaces of complexity higher than coanalytic. On the other hand, we also show that coanalytic sets can be characterized by the existence of a cofinal adequate family of closed sets. Therefore the Banach spaces constructed by means of these families have at most coanalytic complexity.
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