This is the cause of the repulsive short-range twelfth-power term in the Lennard-Jones potential, as well as the degeneracy pressure that keeps white dwarfs stable.
A requirement of this result is satisfied by constructing wavefunctions with a Slater determinant. This is the cause of the repulsive short-range twelfth-power term in the Lennard-Jones potential, as well as the degeneracy pressure that keeps white dwarfs stable. Ehrenfest posited that this result is what gives matter volume, since it prevents atoms from being placed too close together. Wavefunctions must be antisymmetric under exchange due to this principle, which only applies to fermions. It explains why two electrons in the same orbital must have opposite spin, since they cannot occupy the same state. For 10 points, name this "exclusion" principle named for an Austrian physicist.
A requirement of this result is satisfied by constructing wavefunctions with a Slater determinant.
Pauli {exclusion principle} [prompt on "exclusion" principle]