Perfect Mappings and Spaces of Countable Type
نویسندگان
چکیده
منابع مشابه
Relative Ranks of Lipschitz Mappings on Countable Discrete Metric Spaces
Let X be a countable discrete metric space and let XX denote the family of all functions on X. In this article, we consider the problem of finding the least cardinality of a subset A of XX such that every element of XX is a finite composition of elements of A and Lipschitz functions on X. It follows from a classical theorem of Sierpiński that such an A either has size at most 2 or is uncountabl...
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ژورنال
عنوان ژورنال: Canadian Journal of Mathematics
سال: 1970
ISSN: 0008-414X,1496-4279
DOI: 10.4153/cjm-1970-138-3