approximation theory

noun

: 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

Word History

First Known Use

1924, in the meaning defined above

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