Pullbacks, C(X)-algebras, and their Cuntz semigroup

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In this paper we analyse the structure of the Cuntz semigroup of certain C(X)-algebras, for compact spaces of low dimension, that have no K1-obstruction in their fibres in a strong sense. The techniques developed yield computations of the Cuntz semigroup of some surjective pullbacks of C*-algebras. As a consequence, this allows us to give a complete description, in terms of semigroup valued lower semicontinuous functions, of the Cuntz semigroup of C(X,A), where A is a not necessarily simple C*-algebra of stable rank one and vanishing K1 for each closed, two-sided ideal. We apply our results to study a variety of examples. © 2011 Elsevier Inc.
Original languageEnglish
Pages (from-to)2844-2880
JournalJournal of Functional Analysis
Publication statusPublished - 15 May 2011


  • C*-algebras
  • Classification
  • Cuntz semigroup


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