Catterall, S. and Wassermann, S.
(2006)
Continuous bundles of C*-algebras with discontinuous tensor products.
*Bulletin of the London Mathematical Society*, 38(4),
pp. 647-656.
(doi:10.1112/S0024609306018509)

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## Abstract

For each non-exact C*-algebra A and infinite compact Hausdorff space X there exists a continuous bundle B of C*-algebras on X such that the minimal tensor product bundle A⊗B is discontinuous. The bundle B can be chosen to be unital with constant simple fibre. When X is metrizable, B can also be chosen to be separable. As a corollary, a C*-algebra A is exact if and only if A ⊗ B is continuous for all unital continuous C*-bundles B on a given infinite compact Hausdorff base space. The key to proving these results is showing that for a non-exact C*-algebra A there exists a separable unital continuous C*-bundle B on [0, 1] such that A ⊗ B is continuous on [0, 1) and discontinuous at 1, a counter-intuitive result. For a non-exact C*-algebra A and separable C*- bundle B on [0, 1], the set of points of discontinuity of A⊗B in [0, 1] can be of positive Lebesgue measure, and even of measure 1.

Item Type: | Articles |
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Status: | Published |

Refereed: | Yes |

Glasgow Author(s) Enlighten ID: | UNSPECIFIED |

Authors: | Catterall, S., and Wassermann, S. |

Subjects: | Q Science > QA Mathematics |

College/School: | College of Science and Engineering > School of Mathematics and Statistics > Mathematics |

Journal Name: | Bulletin of the London Mathematical Society |

ISSN: | 0024-6093 |

ISSN (Online): | 1469-2120 |

Published Online: | 24 July 2006 |

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