OrthogonalPolynomialsandSpecialFunctions(OPSF)is a veryoldbranchof mathematics having a very rich history. Many famous mathematicians have contributed to the subject: Euler s work on the gamma function, Gauss s and Riemann s work onthe hypergeometricfunctions andthe hypergeometric di?erentialequation, Abel s andJacobi sworkonelliptic functions, andsoon. Usuallythespecialfunctionshavebeenintroducedto solveaspeci?cproblem, and many of them occurred in solving the di?erential equations describing a physical problem, e.g., the astronomerBessel introduced the functions named...