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

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

This is a textbook on classical polynomial and rational approximation theory for the twenty-first century. Aimed at advanced undergraduates and graduate student

The study of linear positive operators is an area of mathematical studies with significant relevance to studies of computer-aided geometric design, numerical an

This excellent textbook introduces the basics of number theory, incorporating the language of abstract algebra. A knowledge of such algebraic concepts as group,