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Approximation theory

theory of getting acceptably close inexact mathematical calculations

Approximation theory is a field of mathematics which is concerned with approximating the values of a function. Usually, the approximation is only needed for a range of values or domain. A good approximation will only have a small error in the domain of interest.

There are different ways in which this approximation is done: common ones are using a combination of simpler functions or using polynomials.

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