The first edition, published in 1906, was a work on “Fourier's Series and Integrals and the Mathematical Theory of the Conduction of Heat”. The second edition followed in 1921, in two volumes.

We’ve seen many graphical and animated explainers for the Fourier series. We suppose it is because it is so much fun to create the little moving pictures, and, as a bonus, it really helps ...

The book starts with a discussion of statistical correlation, before introducing Fourier series and building to the fast Fourier transform (FFT) and related periodogram techniques. The theory is ...