Daily Archives: November 6, 2015

2015-20 Dense function

Prove or disprove the following statement:

There exists a function \( f : \mathbb{R} \to \mathbb{R} \) such that

(1) \( f \equiv 0 \) almost everywhere, and

(2) for any nonempty open interval \(I\), \( f(I) = \mathbb{R} \).

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