Abstract
For a system of identical particles in a pure bound state, the density matrices of positive orders and have the same nonzero eigenvalues with the same multiplicities. If the number of nonzero eigenvalues is finite, these density matrices are unitarily equivalent.
- Received 8 September 1960
DOI:https://doi.org/10.1103/PhysRev.121.659
©1961 American Physical Society