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Best Approximation by Linear Superpositions (Approximate Nomography)
S. Ya. Khavinson, Moscow Civil Engineering Institute, Russia
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Translations of Mathematical Monographs
1997; 175 pp; hardcover
Volume: 159
ISBN-10: 0-8218-0422-7
ISBN-13: 978-0-8218-0422-3
List Price: US$90 Member Price: US$72
Order Code: MMONO/159

This book deals with problems of approximation of continuous or bounded functions of several variables by linear superposition of functions that are from the same class and have fewer variables. The main topic is the space of linear superpositions $$D$$ considered as a subspace of the space of continuous functions $$C(X)$$ on a compact space $$X$$. Such properties as density of $$D$$ in $$C(X)$$, its closedness, proximality, etc. are studied in great detail. The approach to these and other problems based on duality and the Hahn-Banach theorem is emphasized. Also, considerable attention is given to the discussion of the Diliberto-Straus algorithm for finding the best approximation of a given function by linear superpositions.

Graduate students and mathematicians working in approximation theory and constructive function theory, and functional analysts working in deep and nontrivial applications.

Reviews

"A solid introduction to the theory of linear superpositions."

-- Journal of Approximation Theory

• Approximation of functions of two variables by sums $$\varphi (x) + \psi (y)$$