a trigonometric polynomial of grade N without negative frequencies.
I wanna show that
Where meas the convolution of the Fejer Kernel and T.
might be easy..but I just can't work out the right conversion for this property..
from there on I get carried away in the wrong direction. is the derivative right?
Also..the Fejer Kernel can be expressed as the mean arithmetic value of the dirichtlet kernel so:
Where is the Dirichtlet Kernel