- Lebesgue constant
Two kinds of constants are usually called

**Lebesgue constants**(afterHenri Lebesgue ):

* In the process ofinterpolation , the Lebesgue constants (with respect to a set of nodes) measure the precision of thepolynomial interpolation at those nodes in regard with the best polynomial approximation.

* Inapproximation theory , the Lebesgue constants are related toFourier series .

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