Respondent
Theme
The logarithmic derivative of entire functions that close to polynomials
Defence Date
Annotation
In the thesis the relationships between the distribution of zeros of
a zero-order entire function and regular behavior of such characteristics
of its logarithmic derivative as the asymptotic, the Fourier coefficients,
the convergence in Lp[0; 2π]-metric are investigated. In particular, the
necessary conditions for the existence of angular υ-density for zeros of
a zero-order entire function are found in terms of the behavior of its
logarithmic derivative and there are shown that these conditions are
not sufficient; criteria for the existence of angular υ-density for zeros in
some subclass of entire functions of order zero are proved in terms of the
asymptotic behavior of its logarithmic derivative F, regular growth of
the Fourier coefficients of F, convergence of F by p-norm in the space
Lp[0; 2π]; the sufficient conditions for the existence of angular υ-density
for zeros are obtained for the whole class of entire functions of slowly
growth in terms of the Fourier coefficients and convergence Lp[0; 2π]–
metric of the logarithmic derivative of these functions.
Key words: entire function, zero order, angular density of zeros,
logarithmic derivative, Fourier coefficients, regular growth in Lp[0; 2π]–
metric.