##### Exponential polynomials in the oscillation theory
Supposing that $A(z)$ is an exponential polynomial of the form $$A(z)=H_0(z)+H_1(z)e^{\zeta_1z^n}+\cdots +H_m(z)e^{\zeta_mz^n},$$ where $H_j$'s are entire and of order $<n$, it is demonstrated that the function $H_0(z)$ and the geometric location of the leading coefficients $\zeta_1,\ldots,\zeta_m$ play a key role in the oscillation of solutions of the differential equation $f''+A(z)f=0$. The key tools consist of value distribution properties of exponential polynomials, and elementary properties of the Phragm\'en-Lindel\"of indicator function. In addition to results in the whole complex plane, results on sectorial oscillation are proved.
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07/18/19 06:03PM
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mathCVb: Janne Heittokangas, Katsuya Ishizaki, Ilpo Laine, Kazuya Tohge : Exponential polynomials in the oscillation theory https://t.co/1x1aDPh2kw https://t.co/beJs31X2xy