Subspaces of the Sorgenfrey line and their products

Subspaces of the Sorgenfrey line and their products
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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:
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通讯作者:
V. Chatyrko
V. Chatyrko
中科院分区:
--
文献类型:
--
作者:
V. Chatyrko

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本文研究了Sorgenfrey线9的子空间的乘积。使用D的一个想法。K.伯克和J. T.摩尔[2]我们证明了特别是以下内容:设Xi,i = 1,.,n,n;::1,是9的子空间,其中每个Xi是不可数的。然后Xl x. X X X!2可以嵌入9 n+1但不能嵌入9”,其中!2是具有自然拓扑的有理数空间。这个陈述加强了[2,定理2.1]。
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].