*定義 [#g0c400ee] In topological spaces, a subset A is called semiclosed if &ref(http://www.eaflux.com/imgtex/imgtex.fcgi?%5bres=100%5d%7b$%5cmathrm%7bintcl%7dA%5csubset%20A$%7d%25.png);.
*定義 [#g0c400ee] In topological spaces, a subset A is called semiclosed if &ref(http://www.eaflux.com/imgtex/imgtex.fcgi?%5bres=100%5d%7b$%5cmathrm%7bintcl%7dA%5csubset%20A$%7d%25.png);.