Is there a homeomorphism between $\mathbb{R}\setminus \mathbb{Q}$ and $\mathbb{R}^2\setminus \mathbb{Q}^2$, where both are given their usual topologies coming from $\mathbb{R}$ and $\mathbb{R}^2$ respectively? Here $\mathbb{Q}$ denotes the rational numbers.
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The duplicate (and its duplicate) are a nice reference why the two spaces are not homeomorphic. – Asaf Karagila Mar 02 '16 at 06:21