Erratum in the paper
T. H. Koornwinder,
"Jacobi functions and analysis on noncompact semisimple Lie groups",
in: "Special functions: Group theoretical aspects and applications",
R.A. Askey, T.H. Koornwinder and W. Schempp (eds.),
Reidel, Dordrecht, 1984, pp. 1-85.

On p.29, in (4.15) and in the formula on the sixth line belwo (4.15)
replace the exponent of (2 sh t) by k+l and replace the exponent of
(2 ch t) by k-l.