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Norm continuity of weakly continuous mappings into Banach spaces

机译:Banach空间中弱连续映射的范连续性

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摘要

Let T be the class of Banach spaces E for which every weakly continuous mapping from an α-favorable space to £ is norm continuous at the points of a dense subset. We show that: 1. T contains all weakly Lindeloef Banach spaces; 2. l~∞ not ∈ T, which brings clarity to a concern expressed by Haydon ([R. Haydon, Baire trees, bad norms and the Namioka property, Mathematika 42 (1995) 30-42], pp. 30-31) about the need of additional set-theoretical assumptions for this conclusion. Also, (l~∞/c_0) not ∈ T. 3. T is stable under weak homeomorphisms; 4. E ∈ T iff every quasi-continuous mapping from a complete metric space to (E, weak) is densely norm continuous; 5. E ∈ T iff every quasi-continuous mapping from a complete metric space to (E, weak) is weakly continuous at some point.
机译:令T为Banach空间E的类,对于该类,从α有利空间到£的每个弱连续映射在密集子集的点处都是范数连续的。我们证明:1. T包含所有弱Lindeloef Banach空间; 2. l〜∞not∈T,这使Haydon表达的关注变得清晰([R. Haydon,Baire树,不良规范和Namioka属性,Mathematika 42(1995)30-42],第30-31页)关于此结论需要额外的集合理论假设的信息。 (3)T在弱同胚性下是稳定的。 4.从完全度量空间到(E,弱)的每个拟连续映射都是E∈T iff,它是稠密范数连续的; 5. E∈T iff从完全度量空间到(E,weak)的每个拟连续映射在某个点都是弱连续的。

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