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31 Heun FunctionsNotation

§31.1 Special Notation

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

x, y real variables.
z, \zeta, w, W complex variables.
j, k, \ell, m, n nonnegative integers.
a complex parameter, |a|\geq 1,a\neq 1.
q,\alpha,\beta,\gamma,\delta,\epsilon,\nu complex parameters.

The main functions treated in this chapter are \mathit{H\!\ell}\left(a,q;\alpha,\beta,\gamma,\delta;z\right), (s_{1},s_{2})\mathit{Hf}_{m}\left(a,q_{m};\alpha,\beta,\gamma,\delta;z\right), (s_{1},s_{2})\mathit{Hf}_{m}^{\nu}\left(a,q_{m};\alpha,\beta,\gamma,\delta;z\right), and the polynomial \mathit{Hp}_{n,m}\left(a,q_{n,m};-n,\beta,\gamma,\delta;z\right). These notations were introduced by Arscott in Ronveaux (1995, pp. 34–44). Sometimes the parameters are suppressed.