Quantum Systems with Several Degrees of Freedom

The multi-dimensional physical systems with low number of the degrees of freedom take a special place in the development of new analytical and approximate methods for theoretical physics. The approaches used for the systems with the large number of the degrees of freedom and applied to the statistical physics and to the theory of the quantum field are not useable for multi-dimensional systems. For the latter, the alternative approaches are used, which split the variables in Schrodinger equation.