small-world networks
Dunbar's number – Suggested cognitive limit important in sociology and anthropology Erdős number – Closeness of someone's association with mathematician Paul Erdős Erdős–Rényi (ER) model – Two closely related models for generating random graphs
Percolation theory – Mathematical theory on behavior of connected clusters in a random graph Network on a chip – Electronic communication subsystem on an integrated circuit – systems on chip modeled on small-world networks