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Concerning a Problem of K. Kuratowski
Nguyen, Van-Trinh (2006-05-15)
Suppose (S,T) is a topological space and A is any subset of S. Then the functions f and g from the power set of S, P(S), into P(S) are defined as: f(A) is the closure of A and g(A) is the complement of A. In this thesis, ...