On a Class of Analytic Functions from the Quantum Theory of Collisions

The present investigation has its origin in the quantum theory of collisions. It appears appropriate, therefore, to give here a very short review of the subject even though some of the material to be covered in this section may be found in standard publications, such as the Theory of Atomic Collisions by N. F. Mott and H. S. W. Massey (Oxford University Press 1933).