1. Approximation of univalent mappings by automorphisms and quasiconformal diffeomorphismsin [formula omitted].
- Author
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Hamada, H., Iancu, M., and Kohr, G.
- Subjects
- *
AUTOMORPHISMS , *APPROXIMATION theory , *QUASICONFORMAL mappings , *DIFFEOMORPHISMS , *MATHEMATICAL analysis - Abstract
Abstract Let n ≥ 2 and let A ∈ L (C n) be such that m (A) > 0. In this paper, we use a variational result for A -normalized univalent subordination chains, to deduce that every normalized univalent mapping which has A -parametric representation on B n can be approximated locally uniformly on B n by mappings which have A -parametric representation on B n and admit extensions, on one hand, to automorphisms of C n and, on the other hand, to quasiconformal diffeomorphisms of class C ∞ from C n onto C n , which are equal to the identity mapping in a neighborhood of ∞. Finally, we obtain approximation results of A -spirallike, starlike, and convex mappings by automorphisms of C n and quasiconformal diffeomorphisms of class C ∞ from C n onto itself, which are equal to the identity mapping in a neighborhood of ∞ , whose restrictions to B n have the same geometric property. We remark that even though these extensions exist for the same mapping on B n , they are not necessarily equal on C n ∖ B n ¯. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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