PF Member Careful pointed to the website of Gerardus 't Hooft, Dutch physicist and winner of 1999 Nobel Prize in Physics with Martinus J.G. Veltman. 't Hooft has a very interesting and useful website, which includes the following useful pdf file about 'Special Functions and Polynomials'. http://www.phys.uu.nl/~thooft/lectures/specialfct.pdf Includes: Legendre polynomials Associated Legendre polynomials Bessel and Hankel functions Spherical Bessel functions Hermite polynomials Laguerre polynomials Associated Laguerre polynomials Tschebyschev (Chebyshev) polynomials