The “Fourier” Theory of the Cardinal Function
The “Fourier” Theory of the Cardinal Function
The generalised Riesz-Fischer theorem states that if is convergent, with 1 < p ≤ 2, then is the Fourier series of a function of class . When p > 2 the series (2) is not necessarily a Fourier series; neither is it necessarily a Fourier D -series. It will be …