Abstract
We show that a strongly λ-spirallike function of order α can be extended to a sin(πα/2)-quasiconformal automorphism of the complex plane for -π/2 < λ < π/2 and 0 < α < 1 with ¦λ¦ < πα/2. Towards the proof we provide several geometric characterizations of a strongly λ-spirallike domain of order α. We also give a concrete form of the mapping function of the standard strongly λ-spirallike domain \(U_{\lambda,\alpha}\) of order α. A key tool of the present study is the notion of λ-argument, which was developed by Y. C. Kim and the author [5].
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