Python solver for timeless Schrodinger equation for well with arbitrary shape
more pictures https://imgur.com/a/jlhK7OZ
wiki https://en.wikipedia.org/wiki/Dynamical_billiards#Quantum_chaos
Finite difference method
https://www.youtube.com/playlist?list=PLLYQF5WvJdJWIfJ1UFYA2DvM4VT2Ef_86
https://www.youtube.com/playlist?list=PL2W0zf0OhkIkphlIqEnBQBm3FQpYZCjss
Pictures of spherical box 10 - 20 energy levels
Pictures of circular well (80 - 120 energy levels)
https://www.ks.uiuc.edu/Services/Class/PHYS480/EM.pdf
http://oak.ucc.nau.edu/jws8/cubePDE/CubePaperSIADS.pdf
https://en.wikipedia.org/wiki/Spherical_harmonics
http://www.gregegan.net/SCIENCE/SymmetricWaves/SymmetricWaves.html