A simplicial complex is a space with a triangulation. Formally, a simplicial complex K in R^n is a collection of simplices in R^n such that 1. Every face of a simplex of K is in K, and 2. The intersection of any two simplices of K is a face of each of them (Munkres 1993, p. 7). Objects in the space made up of only the simplices in the triangulation of the space are called simplicial subcomplexes. When only simplicial complexes and simplicial subcomplexes are considered, defining homology is particularly easy (and, in fact, combinatorial because of its finite/counting nature). This kind of homology is called simplicial homology.

abstract simplicial complex | homology | nerve | simplex | simplicial homology | simplicial subcomplex | space | triangulation