Construct a function $f : \mathbb{R} → \mathbb{R}$, which is not Lebesgue measurable, but $f^{−1}(\{x\})$ is Lebesgue measurable for every $x \in \mathbb{R}$.
2026-03-30 11:54:25.1774871665
Construct a non Lebesgue measurable function with given condition.
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