Problems and theorems in analysis

PÓLYA, George - SZEGÖ, Gabor. Problems and theorems in analysis. II. Theory of functions. Zeros. Polynomials. Determinants. Number theory. Geometry. Reprint of the 1976 edition. Berlin : Springer-Verlag, 1998. xi, 391 s. Classics in Mathematics. ISBN 3-5406-3686-2.