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A hyperbolic polynomial (HP) is a real univariate polynomial with all roots real. By Descartes’ rule of signs a HP with all coefficients nonvanishing has exactly positive and exactly negative roots counted with multiplicity, where and are the numbers of sign changes and sign preservations in the sequence of its coefficients. For and , we discuss the question: When the moduli of all the roots of a HP are arranged in the increasing order on the real half-line, at which positions can be the moduli of its positive roots depending on the positions of the sign changes in the sequence of coefficients?

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