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Textbook in PDF format

For this inexpensive paperback edition of a groundbreaking classic, the author has extensively rearranged, rewritten, and enlarged the material. Book is unique in its emphasis on the frequency approach and its use in the solution of problems. Contents include: Fundamentals and Algorithms Polynomial Approximation — Classical Theory Fourier Approximation — Modern Theory and Exponential Approximation.
Сontents.
Fundamentals and algorithms.
Polynomial approximation - Classical theory.
Fourier approximation - Modern theory.
Exponential approximation.
Miscellaneous