closed discrete collection

Definition

• Let (X,τ) be a topological space. A collection Y of points of X is said to be closed discrete if every x ∈ X has a neighborhood U such that card(U∩Y)≦1.

Reference

• Willam G. Fleissner, On λ collection Hausdorff spaces, Topology Proceedings 2, (1977, 445-456.