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Sbornik Mathematics
Article . 1994 . Peer-reviewed
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THE PROBLEM OF MULTIPLE INTERPOLATION IN THE HALF-PLANE IN THE CLASS OF ANALYTIC FUNCTIONS OF FINITE ORDER AND NORMAL TYPE

The problem of multiple interpolation in the half-plane in the class of analytic functions of finite order and normal type
Authors: Malyutin, K. G.;

THE PROBLEM OF MULTIPLE INTERPOLATION IN THE HALF-PLANE IN THE CLASS OF ANALYTIC FUNCTIONS OF FINITE ORDER AND NORMAL TYPE

Abstract

Let \(\rho> 1\), \(p= [\rho]\), \(\mathbb{C}_ += \{z: \text{Im }z> 0\}\), \([\rho,\infty)^ +\) be the class of functions \(f(z)\) holomorphic in \(\mathbb{C}_ +\) such that \(\varlimsup| z|^{-\rho}\ln| f(z)|0\)). Furthermore, \(D= \{a_ n,q_ n\}\), \(n=1,2,\dots,a_ n\in \mathbb{C}_ +\), \(q_ n\in \mathbb{N}\) is the divisor, \(\mu\) be the measure \[ \mu(G)= \sum_{a_ n\in G} q_ n\sin\arg a_ n,\qquad \mu(r)= \sum_{| a_ n|\leq r} q_ n\sin\arg a_ n,\qquad \text{and} \] \[ E(z)= E_ D(z)= \prod_{| a_ n|\leq 1}\left({z- a_ n\over z-\bar a_ n}\right)^{q_ n} \prod_{| a_ n|>1} E^{q_ n}_ p(z,a_ n), \] where \[ E_ p(z,a_ n)= {(1-{z\over a_ n})e^{{z\over a_ n}+\cdots+ {z^ p\over pa^ p_ n}}\over (1-{z\over \bar a_ n}) e^{{z\over \bar a_ n}+\cdots+ {z^ p\over p\bar a^ p_ n}}} \] is the Nevanlinna primary factor, \(\Lambda_ n= \min(1,\text{Im }a_ n)\). Problem I. For given \(D= \{a_ n,q_ n\}\) and \(b_{n,k}\in \mathbb{C}\), \(k= 1,2,\dots, q_ n\), \(n= 1,2,\dots\) find \(f\in [\rho,\infty)^ +\) such that \(f^{(k-1)}(a_ n)= b_{n,k}\). Let \(\rho\) be nonintegral. The author proves that problem I is solvable for every sequence \(b_{n,k}\) such that \[ \varlimsup_{n\to\infty} | a_ n|^{-\rho}\ln \max_{1\leq k\leq q_ n} {\Lambda^{k-1}_ n| b_{n,k}|\over (k-1)!}< \infty \] if and only if \[ \varlimsup_{r\to\infty} r^{- \rho}\mu(r)<\infty,\;\varlimsup_{n\to\infty} | a_ n|^{- \rho}\ln{q_ n!\over | E^{(q_ n)}(a_ n)|\Lambda^{q_ n}_ n}< \infty. \] He also gives a criterion for the solvability of problem I in terms of the measure \(\mu\). The more difficult case of \(\rho\) being an integer is also investigated. Let \(\rho(r)\) be a proximate order of Valiron. The author studies the class \([\rho(r),\infty)^ +\). We formulate the results for the case \(\rho(r)\equiv \rho\). An interpolation problem for analogous classes \([\rho(r),\infty)\) of entire functions was previously studied.

Keywords

finite order, normal type, Special classes of entire functions of one complex variable and growth estimates, half-plane, Moment problems and interpolation problems in the complex plane

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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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