论文标题
一个新的小陶氏空间
A new small Dowker space
论文作者
论文摘要
事实证明,如果存在卢津套装,或者如果棍子原理或钻石(b)持有,则猜测原则的强烈实例$ \ clubsuit_ {ad} $在第一个无可统的红衣主教中持有。特别是,上述任何假设都需要存在大小$ \ aleph_1 $的陶氏空间。
It is proved that if there exists a Luzin set, or if either the stick principle or diamond(b) hold, then a strong instance of the guessing principle $\clubsuit_{AD}$ holds at the first uncountable cardinal. In particular, any of the above hypotheses entails the existence of a Dowker space of size $\aleph_1$.