On Tsirelson’s theorem about triple points for harmonic measure

Xavier Tolsa, Alexander Volberg

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)


© The Author(s) 2017. Published by Oxford University Press. All rights reserved. A theorem of Tsirelson from 1997 asserts that given three disjoint domains in R n + 1 , the set of triple points belonging to the intersection of the three boundaries where the three corresponding harmonic measures are mutually absolutely continuous has null harmonic measure. The original proof by Tsirelson is based on the fine analysis of filtrations for Brownian and Walsh-Brownian motions and can not be translated into potential theory arguments. In the present article, we give a purely analytical proof of the same result.
Original languageEnglish
Pages (from-to)3671-3683
JournalInternational Mathematics Research Notices
Issue number12
Publication statusPublished - 1 Jun 2018


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