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Algebra i Analiz, 2008 Volume 20, Issue 2, Pages 3–18 (Mi aa503)

This article is cited in 4 papers

Research Papers

Model functions with nearly prescribed modulus

Yu. S. Belov

St. Petersburg State University, Department of Mathematics and Mechanics

Abstract: Let $\Theta$ be an inner function on the upper half-plane, and let $K_\Theta=H^2\ominus\Theta H^2 $ be the corresponding model subspace. A nonnegative measurable function $\omega$ is said to be strongly admissible for $K_{\Theta}$ if there exists a nonzero function $f\in K_{\Theta}$ with $|f|\asymp\omega$. Certain condition sufficient for strong admissibility are given in the case where $\Theta$ is meromorphic.

Keywords: Admissible function, Beurling–Mallivin theorem, model subspace, logarithmic integral.

MSC: 30D50, 30D55

Received: 20.12.2007


 English version:
St. Petersburg Mathematical Journal, 2009, 20:2, 163–174

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