Guozhu Shang

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For r > 0 let A P(D r) denote the set of 2π-periodic functions which are analytic on the closed rectangle } be a set of nodes in the interval [0, 2π) such that t n,1 < t n,2 < · · · < t n,n , and let T Z n f denote the trigonometric interpolation operator which interpolates f ∈ A P[0, 2π ] on the set Z n. Finally, set h = lim sup n→∞ n n j=1 sin t − t n, j(More)
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