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δ-semiopen

Last-modified: 2011-04-16 (土) 15:53:44

Deinition Edit

  • A subset A of a topological space (X,τ) is said to be δ-semiopen set if there exists a δ-open set U of X such U ⊂ X ⊂ Cl(U).

Reference Edit

  • 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.