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Holomorphic motions commuting with semigroups

Zbigniew Słodkowski (1996)

Studia Mathematica

A holomorphic family f z , |z|<1, of injections of a compact set E into the Riemann sphere can be extended to a holomorphic family of homeomorphisms F z , |z|<1, of the Riemann sphere. (An earlier result of the author.) It is shown below that there exist extensions F z which, in addition, commute with some holomorphic families of holomorphic endomorphisms of ̅ ̅ ̅ ̅ ̅ ̅ f z ( E ) , |z|<1 (under suitable assumptions). The classes of covering maps and maps with the path lifting property are discussed.

Invertible harmonic mappings beyond the Kneser theorem and quasiconformal harmonic mappings

David Kalaj (2011)

Studia Mathematica

We extend the Rado-Choquet-Kneser theorem to mappings with Lipschitz boundary data and essentially positive Jacobian at the boundary without restriction on the convexity of image domain. The proof is based on a recent extension of the Rado-Choquet-Kneser theorem by Alessandrini and Nesi and it uses an approximation scheme. Some applications to families of quasiconformal harmonic mappings between Jordan domains are given.

Mappings of finite distortion: formation of cusps.

Pekka Koskela, Juhani Takkinen (2007)

Publicacions Matemàtiques

In this paper we consider the extensions of quasiconformal mappings f: B → Ωs to the whole plane, when the domain Ωs is a domain with a cusp of degree s &gt; 0 and thus not an quasidisc. While these mappings do not have quasiconformal extensions, they may have extensions that are homeomorphic mappings of finite distortion with an exponentially integrable distortion, but in such a case ∫2B exp(λK(x)) dx = ∞ for all λ &gt; 1/s. Conversely, for a given s &gt; 0 such a mapping is constructed...

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