Published online by Cambridge University Press: 24 October 2008
1. As long ago as 1878 Neumann gave a formula expressing the product of two Legendre polynomials as a sum of such polynomials. In the same year Adams gave an inductive proof, and obtained the result in the form
* Neumann, F. E., Beiträge zur Theorie der Kugelfunctionen (Leipzig, 1878), Part II, p. 86Google Scholar. See also Hobson, E. W., The theory of spherical and ellipsoidal harmonics (Cambridge, 1931), p. 85.Google Scholar
† Adams, J. C., Proc. Royal Soc. 27 (1878), 63CrossRefGoogle Scholar; also Collected Scientific Papers, 1, 487.Google Scholar
‡ Hobson, loc. cit., p. 21 (17).
* Whipple, F. J. W., “On well-poised series”, Proc. London Math. Soc. (2), 24 (1925), 247–263Google Scholar, formula (7.7). See also Whippley, , “A fundamental relation between generalized hypergeometric series”, Journal London Math. Soc. 1 (1926), 138–145CrossRefGoogle Scholar. When n > q we use a limiting form of the transformation owing to the presence of a negative integer in the denominator parameters.
† Hobson, loc. cit., p. 114 (51) and (52).
* Cf. Dougall, J., “A theorem of Sonine in Bessel functions, with two extensions to Spherical Harmonics”, Proc. Edin. Math. Soc. 37 (1919), 33–47CrossRefGoogle Scholar, formula (3). Dougall's formula gives the value of a similar type of integral taken between the limits 0, 1.
† Hobson, loc. cit., p. 87.
* Hobson, loc. cit., p. 113 (49), and p. 114 (50).
* Hobson, loc. cit., p. 234 (67).
† Hobson, loc. cit., p. 234 (68).
‡ Hobson, loc. cit., p. 204 (31).