On the application of the Van Hove theory to disordered systems

Abstract

It is pointed out that Van Hove's theory as applied to the random-lattice problem is equivalent to the wrong Σ (1) approximation of the Green-function diagrammatic method. It is also indicated that van Hove's theory together with the “geometric series” approximation applied to the theory of electron states of liquid metals is equivalent to the simple generalization of so-called quasi-crystalline approximation.