Products of Lindeloef spaces with points $G_delta$
Products of Lindeloef spaces with points $G_delta$
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Lindeloef 空间与点 $G_delta$ 的乘积
DOI:
10.1016/j.topol.2018.11.019
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发表时间:
2019
影响因子:
0.6
通讯作者:
Usuba Toshimichi
中科院分区:
文献类型:
--
作者:
Usuba Toshimichi
We show that if CH holds and either (i) there exists an ω 1-Kurepa tree, or (ii)□(ω 2) holds, then there are regular T 1 Lindelöf spaces X 0 and X 1 with points G δ such that the extent of X 0× X 1 is strictly greater than 2 ω.