Tuesday, January 19, 2016

measure theory - Prove that limntoinftyintinftyinftysin(nt)f(t)dt=0.

I am trying to prove that lim for every Lebesgue integrable function f on \mathbb{R} . My first thoughts were to use Dominated Convergence Theorem but I realised that there is no pointwise limit of the sequence of functions f_n = \sin(nt) f(t) . I do not know how to proceed.


Any help would be appreciated. Thanks!

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