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arXiv · 2010.10358

Non-real zeros of polynomials in a polynomial sequence satisfying a three-term recurrence relation

Innocent Ndikubwayo
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Abstract

This paper discusses the location of zeros of polynomials in a polynomial sequence $\{P_n(z)\}$ generated by a three-term recurrence relation of the form $P_n(z)+ B(z)P_{n-1}(z) +A(z) P_{n-k}(z)=0$ with $k>2$ and the standard initial conditions $P_{0}(z)=1, P_{-1}(z)=\ldots=P_{-k+1}(z)=0,$ where $A(z)$ and $B(z)$ are arbitrary coprime real polynomials. We show that there always exist polynomials in $\{P_n(z)\}$ with non-real zeros.

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Innocent Ndikubwayo. 2020-10-20. Non-real zeros of polynomials in a polynomial sequence satisfying a three-term recurrence relation. https://arxiv.org/abs/2010.10358

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