What is an example of a subset $A$ of the real line $\mathbb{R}$ (equipped with the standard metric topology), such that the subsets $A$, $Int(A)$, $\overline{A}$, $\overline{Int(A)}$ and Int($\overline{A}$) are pairwise different?
2026-05-05 08:49:12.1777970952
Give an example of subset $B$ of the real line $\mathbb{R}$ so the subsets $A$, $Int(A)$, $\overline{A}$, dont intersect
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Let $B=\Bbb Q\cap(1,2),$ and let $A=(0,1)\cup B.$