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We consider real univariate degree real-rooted polynomials with non-vanishing coefficients. Descartes’ rule of signs implies that such a polynomial has positive and negative roots counted with multiplicity, where and are the numbers of sign changes and sign preservations in the sequence of its coefficients, . For , we give the exhaustive answer to the question: When the moduli of all roots are distinct and arranged on the real positive half-axis, in which positions can the moduli of the negative roots be depending on the signs of the coefficients?

生成讲解博客的中文版本

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