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On the complete regularity of growth of the Borel transform of the analytic continuation of the associated function, which has a finite number of singular points
N. V. Govorov,
N. M. Chernykh
Abstract:
The following theorem is proved. Let
$A(z)$ be an entire function of exponential type, and let its Borel transform
$a(z)$ satisfy the following conditions: 1)
$a(z)$ can be analytically continued to a certain Riemann surface
$R$ with finite number of branch points, and it has only finitely many singularities
$z_k$ on
$R$; 2) in any plane with cuts by parallel rays issuing from the
$z_k$, a branch of
$z_k$ satisfies
$$
\varlimsup_{z\to\infty}\frac{\ln|a(z)|}{|z|}\leq0.
$$
Then
$A(z)$ has completely regular growth. From this theorem it follows, in particular, that if
$a(z)$ is an algebraic function or a single-valued function with a finite number of singularities, then
$A(z)$ has completely regular growth.
Bibliography: 6 titles.
UDC:
517.53
MSC: 30D15 Received: 01.02.1977