Definition of approximation theory
: a branch of mathematics that is concerned with finding or deriving the simplest function that matches a limited set of data The fading of interest in orthogonal polynomials is rightly reflected in a lack of courses being taught, says Chihara (Purdue U.-Calumet), and they are now taught in passing, if at all, in courses on approximation theory or mathematical physics. — Reference & Research Book News, 1 Aug. 2011
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First Known Use of approximation theory
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