Let Πn = Πn(it, cosα), where n ≧ 2 is an integer, t ≠0 is real and 0 ≦ α ≦ π, be the class of trigonometrical polynomials Φn with real coefficients and of order ≦ n, such that |Φn(x)| ≦ 1 for all ...
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