Abstract
In this paper, we prove some Turán-type inequalities for the polynomials all of whose zeros lie on a ray emanating from the origin, or symmetrically placed along this ray and having all their zeros in $$|z|\leq K$$, $$K\geq 1$$. Our results are the best possible, and examples of equality cases have been presented.
Publisher
Prof. Marin Drinov Publishing House of BAS (Bulgarian Academy of Sciences)