ppl-空间、wppl-空间被完备映射逆象保持

ppl-space and wppl-space Preserved by the Inverse Image of Perfect Mapping

对ppl-空间、wppl-空间的映射性质进行了探讨,得到的主要结果为:ppl-空间、wppl-空间为完备映射的逆象所保持.

We investigate the property of the mapping in ppl- and wppl-space .The result is that the ppl- and wppl-space are preserved by the inverse image of perfect mapping.