Every square-integrable function on an interval can be written as a linear combination of e^inx (Fourier series).
Are there any other orthogonal and complete set of functions for square integrable functions besides e^inx?
Are there any orthogonal and complete set of functions that work for every function on a finite interval?
Is there some overview of different orthogonal complete set of functions with different conditions on the function, besides square integrable?
And the functions should be linearly independent too.