Fermi-Dirac Distribution Law
f(ε) is the population of the state with energy ε, μ is the Fermi level (??), kb is the Boltzmann constant, T is the temperature
The Bose-Einstein distribution law gives the population of states with energies ε in a system of fermions (particles with half-integer spin).
Thermal Physics, C Kittel, H Kromer, W H Freeman & Co, 2nd edition, 1985