We give some introductory notes about wavelets,
motivating and deriving the basic relations that are used in this context.
These notes should be considered as in introduction to the literature.
They are intended to be used as lecture notes.
Therefore several exercises are provided that should be made to assimilate
We try to give answers to the questions:
What are wavelets?
What is their relation to Fourier analysis?
Where do the scaling function and the wavelet function come from?
Why can they be useful?
What is a wavelet transform?
Where and how are they applied?