If f(x) has a period of 2*pi and |f(x)-f(y)| <= c*|x-y|^a where a and c are positive constants, why are are n-th Fourier coefficients <= c*(pi/n)^a ?(adsbygoogle = window.adsbygoogle || []).push({});

Help or hints would be appreciated.

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# Basic question on fourier coefficients

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