# §33.1 Special Notation

(For other notation see Notation for the Special Functions.)

 nonnegative integers. real variables. nonnegative real variable. real parameters. logarithmic derivative of ; see §5.2(i). Dirac delta; see §1.17. derivatives with respect to the variable.

The main functions treated in this chapter are first the Coulomb radial functions , , (Sommerfeld (1928)), which are used in the case of repulsive Coulomb interactions, and secondly the functions , , , (Seaton (1982, 2002a)), which are used in the case of attractive Coulomb interactions.

## ¶ Alternative Notations

1. Curtis (1964a):

, .

2. Greene et al. (1979):

, , .