In the general form the Heun equation can be written as

(d^2 H)/dy^2+(a _ 1/(y - y1) + a _ 2/(y - y2) + a _ 3/(y - y3))dH/dy+((a _ 4 y - q)/((y - y1) (y - y2) (y - y3)))=0
where a _ 1,a _ 2,a _ 3,a _ 4, q, y1, y2  and y3
are constants, or in a canonical form as (Bateman & Erdélyi 1955)
(-q + x α β) H[x] + (x^2 (1 + α + β) + a γ - x (1 + α + β - δ + a (γ + δ))) H^'[x] + (-1 + x) x (-a + x) H^''[x] = 0
where α,β, γ,δ,α,q, are constants.


Converted by Mathematica  (February 28, 2003)