The field of approximation theory has become so vast that it intersects with every other branch of analysis and plays an increasingly important role in applicat

Most functions that occur in mathematics cannot be used directly in computer calculations. Instead they are approximated by manageable functions such as polynom

This book is intended as a self-contained introduction for non-specialists, or as a reference work for experts, to the particular area of approximation theory t

A pioneer of many modern developments in approximation theory, N. I. Achieser designed this graduate-level text from the standpoint of functional analysis. The