A set, or sequence, A⊆(S,ρ) is said to cluster at a point p∈S (not necessarily p∈A), and p is called its cluster point or accumulation point, iff every globe \(G_...A set, or sequence, A⊆(S,ρ) is said to cluster at a point p∈S (not necessarily p∈A), and p is called its cluster point or accumulation point, iff every globe Gp about p contains infinitely many points (respectively, terms of A. (Thus only infinite sets can cluster.
