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Whitney inequality

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In mathematics, the Whitney inequality gives an upper bound for the error of best approximation of a function by polynomials in terms of the moduli of smoothness. It was first proved by Hassler Whitney in 1957, and is an important tool in the field of approximation theory for obtaining upper estimates on the errors of best approximation.
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    • Statement of the theorem 

    • Proof 

    • Whitney constants and Sendov's conjecture