＜λ-collectionwise Hausdorff

Definition

• A topological space (X,τ) is said to be collectionwise Hausdorff (cwH) if every closed discrete? collection Y of points of X, |Y|<λ, can be screened.

Reference

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