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Last-modified: 2011-12-27 (火) 23:00:37

Definition Edit

  • Let S be a subset of a topological space (X, τ). The set of all λ-cluster points of S is called the λ-closure of S and is denoted by imgtex.fcgi?%5bres=100%5d%7b%5c%5b%20%5crm%7bCl%7d_%5clambda%28S%29%20%5c%5d%7d%25.png.

Reference Edit

  • Caldas Miguel, Jafari Saeid, On some low separation axioms via λ-open and λ-closure operator., Rend. Circ. Mat. Palermo (2) 54 (2005), no. 2, 195–208.