On quasiconformal mappings of open Riemann surfaces.
On quasiconformal reflection. (Zur quasikonformen Spiegelung.)
On quasi-convex functions and related topics.
On quasi-Hadamard product of certain classes of analytic functions.
On Quasiregualr Mappings and Domains with a Complete Conformal Metric.
On quasiregular polynomial mappings
On quasi-starlike functions
On quotients of holomorphic funtions in the dics with boundary regularity conditions.
In this paper we give characterizations of those holomorphic functions in the unit disc in the complex plane that can be written as a quotient of functions in A(D), A∞(D) or Λ1(D) with a nonvanishing denominator in D. As a consequence we prove that if f ∈ Λ1(D) does not vanish in D, then there exists g ∈ Λ1(D) which has the same zero set as f in Dbar and such that fg ∈ A∞(D).
On radial behaviour and balanced Bloch functions.
A Bloch function g is a function analytic in the unit disk such that (1 - |z|2) |g' (z)| is bounded. First we generalize the theorem of Rohde that, for every bad Bloch function, g(rζ) (r → 1) follows any prescribed curve at a bounded distance for ζ in a set of Hausdorff dimension almost one. Then we introduce balanced Bloch functions. They are characterized by the fact that |g'(z)| does not vary much on each circle {|z| = r} except for small exceptional arcs. We show e.g. that∫01 |g'(rζ)|dr <...
On radii of convexity and starlikeness of some classes of analytic functions.
On radii of starlikeness and convexity for convolutions of starlike functions.
On ramifications divisors of functions in a punctured compact Riemann surface.
Let ν be a compact Riemann surface and ν' be the complement in ν of a nonvoid finite subset. Let M(ν') be the field of meromorphic functions in ν'. In this paper we study the ramification divisors of the functions in M(ν') which have exponential singularities of finite degree at the points of ν-ν', and one proves, for instance, that if a function in M(ν') belongs to the subfield generated by the functions of this type, and has a finite ramification divisor, it also has a finite divisor. It is also...
On random entire functions
On rational maps with two critical points.
On ratios of certain analytic functions
On realizability of sign patterns by real polynomials
The classical Descartes’ rule of signs limits the number of positive roots of a real polynomial in one variable by the number of sign changes in the sequence of its coefficients. One can ask the question which pairs of nonnegative integers , chosen in accordance with this rule and with some other natural conditions, can be the pairs of numbers of positive and negative roots of a real polynomial with prescribed signs of the coefficients. The paper solves this problem for degree polynomials.
On recurrence properties of certain lacunary series. I. General results.
On recurrence properties of certain lacunary series. II. General results.
On recurrent mod p sequences.
On Regularly Varying Functions With Applications To Functions Theory.