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Real rank of some multiplier algebras

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arxiv 2402.01022 v1 pith:RYWOALVF submitted 2024-02-01 math.OA

classification math.OA
keywords rankrealalgebramultipliercoronastablealgebrascountably
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abstract

We show that there exists a separable, nuclear C*-algebra with real rank zero and trivial K-theory such that its multiplier and corona algebra have real rank one. This disproves two conjectures of Brown and Pedersen. We also compute the real rank of the stable multiplier algebra and the stable corona algebra of countably decomposable type $\mathrm{I}_\infty$ and type $\mathrm{II}_\infty$ factors. Together with results of Zhang this completes the computation of the real rank for stable multiplier and corona algebras of countably decomposable factors.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. On almost commuting unitary matrices

    math.OA 2025-10 accept novelty 8.0 of 10

    Vanishing winding number implies distance to commuting unitaries is O(||[u,v]||^{1/30}).

  2. The Global Glimm Property for C*-algebras of topological dimension zero

    math.OA 2025-07 accept novelty 7.0 of 10

    For C*-algebras with topological dimension zero, nowhere scatteredness is exactly the Global Glimm Property, solving the Global Glimm Problem in this class.

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