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The order of Lebesgue constant of Lagrange interpolation on several intervals

We consider Lagrange interpolation on the set of finitely many intervals. This problem is closely related to the least deviating polynomial from zero on such sets. We will obtain lower and upper estimates for the corresponding Lebesgue constant. The case of two intervals of equal lengths is simpler, and an explicit construction for two non-symmetric intervals will be given only in a special case.

preprint2015arXivOpen access
A. L. LukashovJ. Szabados
math.CVmath.CA
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A. L. LukashovJ. Szabados

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