Best Approximation by Linear Superpositions (Approximate Nomography)

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This work 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 sub-space of the space of continous 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 ...

Best Approximation by Linear Superpositions (Approximate Nomography) 1997, American Mathematical Society(RI)

ISBN-13: 9780821804223

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