On the inverse–closedness of matrix subalgebras

Nahum Krupnik

Research output: Contribution to journalArticlepeer-review


In this short article we construct a counterexample, which gives a negative answer to an old question, formulated in several publications, on inverse-closedness of matrix subalgebras. We also present and prove several related results.

Original languageEnglish
Pages (from-to)1175-1180
Number of pages6
JournalOperators and Matrices
Issue number4
StatePublished - 1 Dec 2014

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© 2014, Element D.O.O. All rights reserved.


  • Banach algebras
  • Inverse-closed subalgebras of banach algebras


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