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On the Heins theorem

Volume 252 / 2020

Aleksei Kulikov Studia Mathematica 252 (2020), 299-310 MSC: Primary 30D15; Secondary 30E20, 31A15. DOI: 10.4064/sm181214-8-4 Published online: 16 December 2019


It is known that the famous Heins Theorem (also known as the de Branges Lemma) about the minimum of two entire functions of minimal type does not extend to functions of finite exponential type. We study in detail pairs of entire functions $f, g$ of finite exponential type satisfying $\sup _{z\in \mathbb {C}}\min \{|f(z)|,|g(z)|\} \lt \infty .$ It turns out that $f$ and $g$ have to be bounded on some rotating half-planes. We also obtain very close upper and lower bounds for possible rotation functions of these half-planes.


  • Aleksei KulikovDepartment of Mathematics and Computer Science
    St. Petersburg State University
    St. Petersburg, Russia

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