一般拓扑学基础 张德学 《一般拓扑学基础》 · 第 153 页 · Exercise 7.28 For a vertex \(p\) of a simplicial complex \(K\), the closed star of \(p\) is the subcomplex consisting of all faces of simplices in \(\operatorname{st}(p)\). 查看原书页面
