Stable decompositions and rigidity for products of countable equivalence relations

Pieter Spaas*

*Corresponding author for this work

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Abstract

We show that the “stabilization” of any countable ergodic probability measure preserving (p.m.p.) equivalence relation which is not Schmidt, i.e. admits no central sequences in its full group, always gives rise to a stable equivalence relation with a unique stable decomposition, providing the first non-strongly ergodic such examples. In the proof, we moreover establish a new local characterization of the Schmidt property. We also prove some new structural results for product equivalence relations and orbit equivalence relations of diagonal product actions.

Original languageEnglish
JournalTransactions of the American Mathematical Society
Volume376
Issue number3
Pages (from-to)1867-1894
ISSN0002-9947
DOIs
Publication statusPublished - 2023

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