Lines,Trees, and Branch Spaces

In this paper we examine the interactions between the topology of certain linearly ordered topological spaces (LOTS) and the properties of trees in whose branch spaces they embed. As one example of the interaction between ordered spaces and trees, we characterize hereditary ultraparacompactness in a LOTS (or GO-space) X in terms of the possibility of embedding the space X in the branch space of a certain kind of tree.     

Extensions of perfect GO-spaces and -discrete dense sets

In this paper, we prove that if a perfect GO-space has a -discrete dense set, then has a perfect linearly ordered extension. This answers a problem raised by H. R. Bennett, D. J. Lutzer and S. Purisch. And the result is also a partial answer to an old problem posed by H. R. Bennett and D. J. Lutzer.

     

GO-空间乘积正规性的充要条件

本文得到了任意两个GO-空间乘积正规性的一个充要条件.     

On cleavability of continua over LOTS

It is shown that any continuum cleavable over a LOTS is embeddable into .

     

正则不可数基数反映GO-空间的性质

本文对“每一个GO-空间都是可数仿紧的”这一性质进行了推广,得到了“每一个GO-空间都是1:x∈［LX-X］}仿紧的”；论证了在一定条件下，一个拓扑空间和一个GO-空间乘积的正规性与这个拓扑空间和一个正则不可数基数的乘积正规性是等价的;并在这两个结论的基础上，又得出了一些重要的定理.     

两个GO-空间乘积的正规性

本文是在日本数学家Ｋｅｍｏｔｏ １９９３年所作的关于一个ＧＯ－空间（广义线性序空间）和一个正则不可数基数乘积正规性的结果的基础上作了进一步的推广，得到了两个ＧＯ－空间乘积的正规性的一个更一般的结果．     

When is a lots densely orderable?

We obtain sufficient conditions for a linearly ordered topological space (LOTS) to be densely orderable. As a consequence we obtain a characterization of those metrizable LOTS with connected ordered compactifications.     

Metrizably fibered generalized ordered spaces

In this paper we characterize generalized ordered spaces that are metrizably fibered in terms of certain quotient spaces and in terms of the existence of special open covers. We apply our results to give a new characterization of perfect generalized ordered spaces that have a σ-closed-discrete dense subset and to give examples of GO-spaces that are, or are not, metrizably fibered.