A Fejér kernel is a summability kernel used to express the effect of Cesàro summation on Fourier series.
Questions tagged [fejer-kernel]
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Third condition in definition of summability kernel?
https://en.wikipedia.org/wiki/Summability_kernel
The third condition of the definition involving $\delta$, I don't understand what it is trying to say.
Why would the integral go to 0, when condition 1 says otherwise?
MinYoung Kim
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