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Prove that the

i) int(A) is a regular open set for every closed set A

ii) closure(U) is a regular close set for every open set U

For i) is this a valid solution. We have to show that int(A)=int[closure(intA)] Since A is closed set, then A=closure[int(A)] then int(A)=int(A) ???

3 Answers 3