Then as h→+∞ with fixed z in ℜz>0 and fixed
The asymptotic expansions of Fsm(z,h) and Gsm(z,h)
in the same circumstances are also given by the right-hand sides of
(28.26.4) and (28.26.5), respectively.
For additional terms see Goldstein (1927).
See §28.8(iv). For asymptotic approximations for
Mν(3,4)(z,h) see also
Naylor (1984, 1987, 1989).