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[Lebesgue measurability] Can anyone prove this? Let f : Rd → [0, ∞] be an unsigned...

[Lebesgue measurability] Can anyone prove this?
Let f : Rd → [0, ∞] be an unsigned function. Prove that the function f is measurable.


It is just an unsigned function. The question does not talk about if f is continuous or not. Thanks.
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