Let $A$ be a subset of $\mathbb{R}^n$ (with $n\geq 1$, endowed with its usual topology) homeomorphic to $\mathbb{R}^n$. Is $A$ an open subset of $\mathbb{R}^n$?
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Let $A$ be a subset of $\mathbb{R}^n$ (with $n\geq 1$, endowed with its usual topology) homeomorphic to $\mathbb{R}^n$. Is $A$ an open subset of $\mathbb{R}^n$?