摘要
构造了一个反例回答了基数不等式|X|<2^(c(X)Δ(X))不仅对于正则空间类不成立,甚至对Tychonoff空间类亦不成立。
In this note, we give an example of a c.c.c.Tychonoff space with a Gδ-diagonal such that it's cardinality is arbitrary large, and negatively answer a question posed by Ginsburg and Woods in AMS.
