Authors: Farah, Ilijas 
Phillips, N. Christopher
Steprans, Juris
Affiliations: Mathematical Institute of the Serbian Academy of Sciences and Arts 
Title: The commutant of L(H) in its ultrapower may or may not be trivial
Journal: Mathematische Annalen
Volume: 347
Issue: 4
First page: 839
Last page: 857
Issue Date: 1-Aug-2010
Rank: M21
ISSN: 0025-5831
DOI: 10.1007/s00208-009-0448-z
Abstract: 
Kirchberg asked in 2004 whether the commutant of L(H) in its (norm) ultrapower is trivial. Assuming the Continuum Hypothesis, we prove that the answer depends on the choice of the ultrafilter.
Publisher: Springer Link

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