bead on a wire, 3D harmonic oscillator

helium revisited, two-fold degeneracy, and a short-cut

linear and cubic perturbations of the simple harmonic oscillator

time-independent, non-degenerate, perturbation theory, delta function perturbation of a square well

Fermi-Dirac, Bose-Einstein distributions, expansion rate of the Universe, black body spectrum, Bose condensation

white dwarfs continued, neutron stars, most probable configuration

free electron gas, Fermi surface, white dwarfs

identical particles, atoms, and the periodic table

adding together the spin of two spin half particles, Clebsch-Gordan coefficients

spin operators, Lamor precession, Stern-Gerlach revisited