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en.wikipedia.org/wiki/Approximation_theory
In mathematics, approximation theory is concerned with how functions can best be approximated with simpler functions, and with quantitatively characterizing the ...

www.journals.elsevier.com/journalofapproximationtheory
The Journal of Approximation Theory is devoted to advances in pure and applied approximation theory and related areas. These areas include, among others:

simple.wikipedia.org/wiki/Approximation_theory
Approximation theory is a field of mathematics which is concerned with approximating the values of a function. Usually, the approximation is only needed ...

mathworld.wolfram.com/ApproximationTheory.html
The mathematical study of how given quantities can be approximated by other (usually simpler) ones under appropriate conditions. Approximation theory also studies the ...

books.google.com/books/about/Approximation_Theory_and_Methods.html
Most functions that occur in mathematics cannot be used directly in computer calculations. Instead they are approximated by manageable functions such as polynomials ...

www4.ncsu.edu/~mtchu/Teaching/Lectures/MA530/chapter7.pdf
Chapter 7 Approximation Theory The primary aim of a general approximation is to represent nonarithmetic quantities by arithmetic quantities so that the accuracy can ...

www.open.ac.uk/postgraduate/modules/m832
Approximation theory is concerned with approximating functions of a given class using functions from another, usually more elementary, class. A simple example is the ...

www.math.vanderbilt.edu/~AT15
This conference is a continuation of the earlier conferences on approximation theory held in Austin (1973, 1976, 1980, 1992), College Station (1983, 1986, 1989, 1995 ...

en.wikipedia.org/wiki/Category:Approximation_theory
In mathematics, approximation theory is concerned with how functions can be approximated with other, simpler, functions, and with characterizing in a quantitative way ...

personal.bgsu.edu/~carother/Approx.html
This is a set of lecture notes for a short course on Approximation Theory that I have offered several times to graduate students at Bowling Green State University ...