Zeitschrift für Analysis und ihre Anwendungen
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Published online: 1999-12-31
Estimates for Quasiconformal Mappings onto Canonical DomainsVo Dang Thao (1) National University, Hochiminh City, Vietnam
In this paper we establish estimates for $K$-quasiconformal mappings $z = g(w)$ of a domain bounded by two circles $|w| = 1, |w| = q$ and $n$ continua situated in $q < |w| < 1$ onto a circular ring $Q(g) < |z| < 1$ that has been slit along $n$ arcs on the circles $|z| = R_j(g) (j = 1,... ,n)$ such that $|z| = 1$ and $|z| = Q$ correspond to $|w| = 1$ and $|w| = q$, respectively. The bounds in the estimates for $Q, R_j$ and $|g(w)|$ are explicitly given, most of them are optimal. They are deduced mainly from .
Keywords: K-quasiconformal mappings, Riemann moduli of a multiply-connected domain, monotony of the modulus of a doubly-connected domain
Thao Vo Dang: Estimates for Quasiconformal Mappings onto Canonical Domains. Z. Anal. Anwend. 18 (1999), 819-825. doi: 10.4171/ZAA/915