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azure kitsune
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Homework Statement
Show that the set of rational numbers in the interval (0, 1) cannot be expressed as the intersection of a countable collection of open sets.
Homework Equations
The Attempt at a Solution
This sounds like something requiring proof by contradiction. There must be a property of [tex]\mathbb{Q} \cap (0,1)[/tex] that I need, but I can't think of any. Can someone give me a hint?