Simplex : 单纯 (plural Simplices)
Simplicial Complex: 单纯復形 built by various Simplices under some rules.
Definitions of Simplex :
Theorem: SO SIMPLE !!!
Follow the entire Algebraic Topology from University of New South Wales (3rd / 4th Year Math) :
Algebraic Topology: a beginner’s course – N J Wildberger: