Fourier analysis and wavelets are good subjects with which to try
another approach. The idea that information can be represented in
different forms-that a mathematical function or a physical signal can
become a Fourier transform or a wavelet transform, and that this trans-
formation is useful-has had an enormous impact, both intellectual and
practical, on our society.
This book is then both modest in scope and daring (not to say
foolhardy) in design. It is only a brief introduction to a vast subject
that itself is only a small part of mathematics; but I wanted to make
this subject accessible to those who have no mathematical background
to speak of, while giving enough details so that those who are more
sophisticated will find it useful.