打开Sorgenfrey line的图片
Open images of the Sorgenfrey line
摘要:
我们给出了描述豪斯多夫连续开放图像的Sorgenfrey线:这些正是那些空间,有一个Sorgenfrey基地。利用这种描述,我们证明了没有一个包含Sorgenfrey线的拷贝的Hausdorff紧空间是它的连续开像;特别是双箭头空间不是Sorgenfrey线的连续开像。
英文摘要:
We give a description of Hausdorff continuous open images of the Sorgenfrey line: these are precisely those spaces that have a Sorgenfrey base. Using this description we prove that no Hausdorff compact space that contains a copy of the Sorgenfrey line is a continuous open image of it; in particular the double-arrow space is not a continuous open image of the Sorgenfrey line.
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