English

On Descartes' rule of signs for hyperbolic polynomials

Classical Analysis and ODEs 2024-01-09 v1

Abstract

We consider univariate real polynomials with all roots real and with two sign changes in the sequence of their coefficients which are all non-vanishing. One of the changes is between the linear and the constant term. By Descartes' rule of signs, such degree dd polynomials have 22 positive and d2d-2 negative roots. We consider the sequences of the moduli of their roots on the real positive half-axis. When the moduli are distinct, we give the exhaustive answer to the question at which positions can the moduli of the two positive roots be.

Keywords

Cite

@article{arxiv.2304.02307,
  title  = {On Descartes' rule of signs for hyperbolic polynomials},
  author = {Vladimir Petrov Kostov},
  journal= {arXiv preprint arXiv:2304.02307},
  year   = {2024}
}