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Last-modified: 2011-12-27 (火) 18:56:05

Definition Edit

  • Let (X,τ) be a topological space. A subset S of X is called a Λ-set if it is equal to the intersection of all open supersets of S.

Reference Edit

  • Caldas Miguel, Jafari Saeid, Navalagi Govindappa, More on λ-closed sets in topological spaces.,Rev. Colombiana Mat. 41 (2007), no. 2, 355-369.