In this paper we prove that a space X with point-countable sequential neighborhood network if and only if it is α4-spac......

In this paper, spaces with a locally countable sn-network are discussed. It is shown that a space with a locally countab......

In this paper the relation between the σ-images of metrical spaces and spaces with σ-locally finite cs-network, or spa......

利用σ-映射与m ssc-映射建立了具有σ-局部有限cs-网、σ-局部有限cs＊-网的空间以及X-空间与度量空间确定映象之间的联系,得到了具......