Subspaces of the Sorgenfrey line and their products
Subspaces of the Sorgenfrey line and their products
复制标题
Sorgenfrey 系列及其产品的子空间
DOI:
10.21099/tkbjm/1496165070
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发表时间:
2006
期刊:
影响因子:
--
通讯作者:
V. Chatyrko
中科院分区:
文献类型:
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作者:
V. Chatyrko
In this article we study the products of subspaces of the Sorgenfrey line 9. Using an idea by D. K. Burke and J. T. Moore [2] we prove in particular the following: Let Xi, i = 1, ... ,n, n;::: 1, be subs paces of 9, where each Xi is uncountable. Then Xl x ... X Xn x !2 can be embedded in 9 n+1 but can not be embedded in 9", where !2 is the space of rational numbers with the natural topology. This statement strengthens [2, Theorem 2.1].