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Let p<sub>n</sub>（z）=∑<sub>k-0</sub><sup>n</sup> a<sub>k</sub>z<sup>k</sup> be a polynomial of degree n such that |p<sub>n</sub>（z）|≤M for |z|≤1. It is well.known that for 0≤u【v≤n, |a