A unifying approach suitable for graduate students and mathematicians. It will serve as a textbook and as a convenient reference.

Richard Beals is Professor Emeritus of Mathematics at Yale University.

Preface; 1. Orientation; 2. Gamma, beta, zeta; 3. Second order differential equations; 4. Orthogonal polynomials; 5. Discrete orthogonal polynomials; 6. Confluent hypergeometric functions; 7. Cylinder functions; 8. Hypergeometric functions; 9. Spherical functions; 10. Asymptotics; 11. Elliptic functions; References; Index.