Advanced. Not beginner friendly, very clunky.
One dimension in position representation:
In three dimensions In position representation, we define it by using the gradient, and so we see that
Position and Momentum from Wavefunctions by Faculty of Khan (2018)
Source. Proves in detail why the momentum operator is . The starting point is determining the time derivative of the expectation value of the position operator.Music notation engine. domain-specific language input. The LaTeX of music.
Dominating awesome list: https-github-com-nodiscc-awesome-linuxaudio
A large part of these projects are on SourceForge as of 2020, it is scary. They just die.
There are unlisted articles, also show them or only show them.