选择、仿紧性与Compactness
Selections, Paracompactness and Compactness
摘要：
本文利用下半连续闭值映射到完备度量化（或离散）空间的选择，刻画了Lindelof数、空间的紧度和仿紧空间的余零维核的紧度.
英文摘要：
In the present paper, the Lindelof number and the degree of compactness of spaces and of the cozero-dimensional kernel of paracompact spaces are characterized in terms of selections of lower semi-continuous closed-valued mappings into complete metrizable (or discrete) spaces.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
