Hardy spaces in the disc are related to Fourier series.

It is called a Fourier series if the terms and have the form:

This class of functions can be expanded in Fourier series.

This is fundamental to the study of Fourier series.

This fact is a central one in Fourier series.

A complex-number form of Fourier series is also commonly used.

See Fourier series for more information, including the historical development.

He is best known for starting the investigation of Fourier series.

The same condition also occurs in the uniqueness problem for Fourier series.

The distorted signal can be described by a Fourier series in f.