×

On new symmetrization of rings in space. (Chinese. English summary) Zbl 0789.30010

f new symmetrization for rings in the plane is established, which contains the spherical symmetrization of F. W. Gehring as a special case. By making use of the new symmetrization, an extremal problem for rings in space is solved.
Reviewer: Li Zhong (Beijing)

MSC:

30C80 Maximum principle, Schwarz’s lemma, Lindelöf principle, analogues and generalizations; subordination

Keywords:

symmetrization
PDFBibTeX XMLCite