, Volume 51, Issue 5, pp 899-912
Date: 21 Oct 2010

On the Branch Points of Mappings with the Unbounded Coefficient of Quasiconformality

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We study relations between the quantity characterizing the distortion of families of curves under a given mapping and the structure of the branch point set of this mapping. For n ⩽ 3 we establish that the image of the branch point set of an open discrete mapping with an isolated essential singularity is an unbounded set in Rn provided that the mapping satisfies certain geometric conditions controlling the distortion of concentric annuli centered at this point.

Original Russian Text Copyright Sc 2010 Sevost’ yanov E. A.
Translated from Sibirskiĭ Matematicheskiĭ Zhurnal, Vol. 51, No. 5, pp. 1129-1146, September–October, 2010