New applications of the Lambert and generalized Lambert functions to ferromagnetism and quantum mechanics

The applications of the recent results obtained in the theory of generalized Lambert functions, to the mean field theory of ferromagnetism are presented. As a consequence, all the predictions of the Weiss theory of ferromagnetism can be explicitly and exactly formulated. In several quantum mechanical problems involving delta function potentials, the solutions of the transcendental eigenvalue equations are expressed in terms of two parameters generalized Lambert functions. Some others, till unnoticed examples of eigenvalue equations whose solutions can be written using the Lambert W function, are also presented.