EDB — 178

[178] Prerequisites:[0Q8]↺↻,[174]↺↻.Given $A\subset {ℝ}^n$ convex with non-empty interior, show that $\bar{A}=\overline{(A^{\circ })}$ (the closure of the interior of $A$). Then find a simple example of $A$ for which $\bar{A}\ne \overline{(A^{\circ })}$.