Proper map
（重定向自Proper mapping）
In mathematics, a function between topological spaces is called proper if inverse images of compact subsets are compact. In algebraic geometry, the analogous concept is called a proper morphism.
网站首页 情感咨询 情感美文 情感百科 情感生活 学习充电 旧版美文
依恋情感网英汉例句词典收录3870147条英语例句词条，基本涵盖了全部常用英语单词的释义及例句，是英语学习的有利工具。