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Location of the critical points of certain polynomials

Somjate ChaiyaAimo Hinkkanen — 2013

Annales Universitatis Mariae Curie-Skłodowska, sectio A – Mathematica

Let 𝔻 denote the unit disk { z : | z | < 1 } in the complex plane . In this paper, we study a family of polynomials P with only one zero lying outside 𝔻 ¯ .  We establish  criteria for P to satisfy implying that each of P and P '   has exactly one critical point outside 𝔻 ¯ .

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