(Λ,sδ)-closed

Last-modified: 2011-04-16 (土) 15:32:15

Definition

  • A subset A of a topological space (X,τ) is called (Λ,sδ)-closed, if A=T∩C, where T is a Λ^s_δ-set and C is a δ-semiclosed set.

Reference

  • Caldas, M.; Ganster, M.; Georgiou, D. N.; Jafari, S.; Moshokoa, S. P., δ-semiopen sets in topology. (English summary), Proceedings of the 19th Summer Conference on Topology and its Applications., Topology Proc. 29 (2005), no. 2, 369–383.