The mathematical description of quantum systems by reduced density matrices of a canonical ensemble

Mathematical description of quantum systems by the method of reduced density matrices of a canonical ensemble

Method of m-particle density matrices of the canonical ensemble in the description of states of quantum systems

Mathematical description of the states of bose and fermi systems by the method of partial density matrices of the canonical ensemble

DENSITY MATRICES IN QUANTUM MECHANICS

Reduced density matrices of a system of N coupled oscillators 2. eigenstructure of the 1-particle matrix for the canonical ensemble

A complete classification of quantum ensembles having a given density matrix