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 ...

A mathematical theorem stating that a PERIODIC function f(x) which is reasonably continuous may be expressed as the sum of a series of sine or cosine terms (called the Fourier series), each of which ...

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.