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BERNSTEIN INEQUALITIES FOR POLYNOMIALS WITH CONSTRAINED ROOTS

We prove Bernstein type inequalities for algebraic polynomials on the finite interval I := [−1, 1] and for trigonometric polynomials on R when the roots of the polynomials are outside of a certain domain of the complex plane. The case of real vs. complex coefficients are handled separately. In case of trigonometric polynomials with real coefficients and root restriction, the Lpsituation will also be considered. In most cases, the sharpness of the estimates will be shown.