A graph complex on G is an abstract simplicial complex consisting of subsets of E.In particular, we may interpret such a complex as a family of subgraphs of G.

• 但是在检测工作上，若用人眼判断影像瑕疵，常会因为人为主观上或疲劳造成错误，因此在检测图形瑕疵，需用电脑进行图形比对及侦测瑕疵。