Definition
- A subset S of a topological space (X,τ) is called a λ-closed if S = L∩F, where L is a Λ-set and F is closed.
Reference
- Arenas Francisco G., Dontchev Julian, Ganster Maximilian, On λ-sets and the dual of generalized continuity., Questions Answers Gen. Topology 15 (1997), no. 1, 3-13.