Algebraic Topology: Homotopy and Homology
《Algebraic Topology: Homotopy and Homology》 · 第 64 页 · Definition 5.1
A cell complex \(K\) on a space \(X\) is a collection \(K=\{e_\alpha^n\}\) of subsets of \(X\); the set \(e_\alpha^n\) is called a cell of dimension \(n\).