Base-ortho-compact space is also base-ortho-compact under the finite-to-one open mapping.
5、基-ortho紧空间在有限对一开映射下的象是基-ortho紧空间。
参考来源 - ortho紧、基·2,447,543篇论文数据，部分数据来源于NoteExpress
三商映射是完备映射和开映射的共同推广。
Tri quotient maps are a common generalization of perfect maps and open maps.
然后将自动打开映射编辑器（请参见图 8）。
给出了强ps -不定开映射和强ps -不定闭映射的概念，并且讨论了它们的一些性质。
The concepts of strong PS-irresolute open mapping and strong PS-irresolute closed mapping are introduced in L-spaces and their properties are researched.
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