Translated (by M.E. Alferieff) from the 1981 Russian edition, this book offers first-year graduate students a solid text. Beginning with a study of the simplest problem, it goes on to examine areas in
A pioneer of many modern developments in approximation theory, Achieser begins this text with approximation problems in linear normalized spaces and the ideas of P. L. Tchebysheff. He then examines th
This classic textbook introduces linear operators in Hilbert Space, and presents the geometry of Hilbert space and the spectral theory of unitary and self-adjoint operators. Invaluable for every math
