Question: Let (u: mathbb{R} ightarrow mathbb{R}) be differentiable. Explain why (u) and (u^{prime}=d u / d x) are measurable.

Let \(u: \mathbb{R} ightarrow \mathbb{R}\) be differentiable. Explain why \(u\) and \(u^{\prime}=d u / d x\) are measurable.

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