On Point countable Sequential Neighborhood Networks

In this paper we prove that a space X with point countable sequential neighborhood network if and only if it is α 4 space with point countable cs network.

关于Lanev空间

本文给出非-空间的Lasnev空间的一个特征。作为它的推论,我们证明了一个Lasnev空间是一个?-空间当且仅当它具有点可数cs-网。