Re: nice integral inequality



eugene wrote:
I have a problem which seems interesting to me, but i don't have any
idea how to approach it:
Let f:[0,1]->C -Lebesgue integrable. Prove that there exists a
measurabke subset of [0,1] such that
| int_0^1 f(x)dx | >= (1/pi) * int_0^1 |f(x)|dx.

What has this inequality to do with a measurable subset of [0,1]?

Best regards,

Jose Carlos Santos
.



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