GREY SUBSETS OF POLISH SPACES
GREY SUBSETS OF POLISH SPACES
复制标题
波兰空间的灰色子集
DOI:
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发表时间:
2011
期刊:
影响因子:
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通讯作者:
Julien Melleray
中科院分区:
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作者:
Itay Ben;Julien Melleray
Abstract We develop the basics of an analogue of descriptive set theory for functions on a Polish space X. We use this to define a version of the small index property in the context of Polish topometric groups, and show that Polish topometric groups with ample generics have this property. We also extend classical theorems of Effros and Hausdorff to the topometric context.