Let be a measurable subset of with and let be a real-valued measurable function on . Prove that for any , there exists a bounded measurable function on such that .

Again, how do I go about doing it? Thanks in advance.

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- Sep 25th 2011, 10:08 AMMarkeurMeasurable Functions (2)
Let be a measurable subset of with and let be a real-valued measurable function on . Prove that for any , there exists a bounded measurable function on such that .

Again, how do I go about doing it? Thanks in advance. - Sep 25th 2011, 01:35 PMTinybossRe: Measurable Functions (2)
Okay, so what's the main issue here? If you just let , then the measure of the set where they differ is certainly less than . But of course, then may not be bounded as required. So try defining , and looking at what happens to as goes to infinity.

- Sep 26th 2011, 06:39 AMMarkeurRe: Measurable Functions (2)
Okay managed to solved it. Though I used g(x) = f(x) if x lies in A, g(x) = 0 otherwise.

Thanks anyway.