1984Transactions of the American Mathematical SocietyRequires access

Real Zeros of Derivatives of Meromorphic Functions and Solutions of Second Order Differential Equations

Simon Hellerstein, Li‐Chien Shen, Jack Williamson

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Abstract

We classify all functions $F$ meromorphic in the plane with only real zeros and real poles which satisfy the additional conditions that $F’$ has no zeros and $F''$ only real zeros. We apply this classification, in combination with some earlier results, to the study of the reality of zeros of solutions of the equation $w'' + H(z)w = 0,H$ entire.

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What this paper is about

We classify all functions $F$ meromorphic in the plane with only real zeros and real poles which satisfy the additional conditions that $F’$ has no zeros and $F''$ only real zeros. We apply this classification, in combination with some earlier results, to the study of the reality of zeros of solutions of the equation $w'' + H(z)w = 0,H$ entire.

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OpenAlex reports 9 citations for this work. Citation counts describe recorded attention and do not establish research quality.

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Available abstract

We classify all functions $F$ meromorphic in the plane with only real zeros and real poles which satisfy the additional conditions that $F’$ has no zeros and $F''$ only real zeros. We apply this classification, in combination with some earlier results, to the study of the reality of zeros of solutions of the equation $w'' + H(z)w = 0,H$ entire.

Key concepts: Meromorphic function, Mathematics, Complex plane, Order (exchange), Entire function, Plane (geometry), Pole–zero plot, Differential equation

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