Harmonic structure of one-dimensional quadratic maps

We study here the ``harmonic structure'' of one-dimensional quadratic maps. The patterns of the structure can be generated with only one initial datum: the symbolic sequence C of the period-1 superstable orbit. All the patterns of the structure are F harmonics (Fourier harmonics). Rules to compose two patterns and rules to calculate F-harmonics are given. The harmonic-structure matrix which contains all the F harmonics in a very compact way by means of the harmonic notation is introduced.