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pre-D_0

Last-modified: 2010-12-08 (水) 02:38:54

Definition Edit

  • A topological space (X,τ) is said to be pre-D_0 if for any distinct pair of points x and y of X , there exists a pD-set of X containing x but not y or a pD-set of X containing y but not x.

Reference Edit

  • Caldas, M.; Georgiou, D. N.; Jafari, S. , Characterizations of low separation axioms via α-open sets and α-closure operator., (English summary) Bol. Soc. Parana. Mat. (3) 21 (2003), no. 1-2, 97–111.