 26C05 Polynomials: analytic properties, etc.
 26C10 Polynomials: location of zeros.
 26C15 Rational functions.
 30B70 Continued fractions.
 30C10 Polynomials.
 30C15 Zeros of polynomials, rational functions, and other analytic functions.
 30E05 Moment problems, interpolation problems.
 30E10 Approximation in the complex domain
 31A15 Potentials and capacity, harmonic measure, extremal length.
 33C45 Orthogonal polynomials and functions of hypergeometric type.
 33C47 Other special orthogonal polynomials and functions.
 33D45 Basic orthogonal polynomials and functions.
 42C05 Orthogonal functions and polynomials, general theory.
 41A17 Inequalities in approximation.
 41A20 Approximation by rational functions.
 41A21 Padé approximation.
 41A25 Rate of convergence, degree of approximation.
