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  • Avkhadiev F.; Wirths K. (2003)
    Let Ω and Π be two simply connected domains in the complex plane C which are not equal to the whole plane C and let λΩ and λΠ denote the densities of the Poincaré metric in Ω and Π, respectively. For f : Ω → Π analytic in ...
  • Avkhadiev F.; Wirths K. (2004)
    Let Ω and Π be two hyperbolic simply connected domains in the extended complex plane C̄ = C ∪ {∞}. We derive sharp upper bounds for the modulus of the nth derivative of a holomorphic, resp. meromorphic function f: Ω → Π ...
  • Avkhadiev F.; Wirths K. (2011)
    Let Ω be an n-dimensional convex domain with finite inradius δ 0 = sup xεΩ δ, where δ = dist(x,ρΩ), and let (p,q) be a pair of positive numbers. For functions vanishing at the boundary of the domain and any v € [0, p/q] ...
  • Avkhadiev F.; Pommerenke C.; Wirths K. (2006)
    Let D denote the open unit disc and let f: D → ℂ be holomorphic and injective in D. We further assume that f(D) is unbounded and ℂ \ f(D) is a convex domain. In this article, we consider the Taylor coefficients a n(f) of ...
  • Avkhadiev F.; Wirths K. (2009)
    As we have seen in Chapter 6 it is a very difficult task to find sharp punishing factors or substitutes for them in cases where multiply connected domains are involved. From this point of view, it seems natural that the ...
  • Avkhadiev F.; Wirths K. (2013)
    We consider functions f that are meromorphic and univalent in the unit disc D with a simple pole at the point p ∈ (0, 1) and normalized by f(0) = f′(0) - 1 = 0. A function g is called subordinated under such a function f, ...
  • Avkhadiev F.; Wirths K. (2005)
    Let Ω be a domain in ℂ̄ with three or more boundary points in ℂ̄ and R(w, Ω) the conformal, resp. hyperbolic radius of Ω at the point w ∈ Ω \{∞}. We give a unified proof and some generalizations of a number of known theorems ...
  • Avkhadiev F.; Wirths K. (2009)
    For more than two thousand years, mathematicians and other people believed in the "truth" of the Euclidean parallel axiom, before Lobachevsky and Bolyai about 1825-1830 found that it is possible to get a new geometry by ...
  • Avkhadiev F.; Wirths K. (2007)
    Let Ω and ∏ be two simply connected proper subdomains of the complex plane ℂ. We are concerned with the set A(Ω, ∏) of functions f : Ω → ∏ holomorphic on Ω and we prove estimates for |f(n)(z)|, f ∈ A(Ω, Ω),z ∈ Ω, of the ...
  • Avkhadiev F.; Wirths K. (2007)
    Let Ω be an n-dimensional convex domain, and let v ∈ [0,1/2]. For all f ∈ H0 1(Ω) we prove the inequality ∫Ω |∇ f2 dx ≥ (1/4 - v2) ∫Ω |f|2/δ2 dx + λv 2/δ0 2 ∫Ω |f|2 dx, where δ = dist(x, ∂Ω), δ0 = sup δ. The factor λv 2, ...
  • Avkhadiev F.; Wirths K. (2010)
    Using the Bessel functions we obtain several weighted Hardy inequalities with sharp constants. The following inequality for absolutely continuous functions is a simple example: If p and ν are positive numbers, and f: [0, ...

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