I have been taught an harmonic wave in physics follows either a sine or cosine function.
https://en.wikipedia.org/wiki/Harmonic_function
Are there any Harmonic functions other than Sine and Cosine?
Why is the specific case of the Power Mean with P = -1 called an Harmonic Mean?
Are the variables somehow in a "good" relation between each other?
Sine, Cosine, Harmonic Functions, Harmonic Series, Harmonic Number, Harmonic Analysis, Harmonic Conjugates.
How are these exactly related? Why the term harmonic? Is any good relationship expressed?