Last-modified: 2011-11-11 (金) 15:08:38
- For a subset A of X, the intersection of all β-closed sets of X containing A is called the β-closure (in short β-cl(A)) of A.
- Basu, C. K.; Afsan, B. M. Uzzal; Ghosh, M. K., A class of functions and separation axioms with respect to an operation. (English summary), Hacet. J. Math. Stat. 38 (2009), no. 2, 103-118.