Ordering of sets, hyperbolic metrics, and harmonic measures

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Abstract

We establish a series of inequalities which relate solutions to certain partial differential equations defined on a given system of open sets with similar solutions defined on the ordered system of sets. As a corollary, we prove a comparison theorem for the hyperbolic metric that allows us to interpret this metric as a Choquet capacity. Using a similar comparison theorem for harmonic measures, we give a solution to S. Segawa's problem on the set having the minimal harmonic measure among all compact sets that lie on the diameter of the unit disk and have a given linear measure.

Original languageEnglish
Pages (from-to)2256-2266
Number of pages11
JournalJournal of Mathematical Sciences
Volume95
Issue number3
DOIs
StatePublished - 1999

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