Approximation Theory, including: Euler-maclaurin Formula, Chebyshev Polynomials, Hilbert Matrix, Trigonometric Polynomial, Modulus Of Continuity, ... Approximation, Bramble-hilbert Lemma

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More info: In mathematics, approximation theory is concerned with how functions can best be approximated with simpler functions, and with quantitatively characterizing the errors introduced thereby. Note that what is meant by best and simpler will depend on the application.