closed discrete collection
Last-modified: 2011-04-16 (土) 14:54:27
- 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.
- Willam G. Fleissner, On λ collection Hausdorff spaces, Topology Proceedings 2, (1977, 445-456.