\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
Hausdorff separation in practice. For \(a = 1\) and \(b = 4\) in \(\mathbb{R}\), exhibit two disjoint neighborhoods \(V_a, V_b\) of \(a, b\) by giving explicit radii.
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