Spectral synthesis in the multiplier algebra of a C_0(X)-algebra

Robert J Archbold, Douglas W. B. Somerset

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Let A be a C0(X)-algebra with continuous map φ from Prim(A), the primitive ideal space of A, to a locally compact Hausdorff space X. Then the multiplier algebra M(A) is a C(β X)-algebra with continuous map Graphic: Prim(M(A)) → β X extending φ. For x ∈ Im(φ), let Jx = ⋂{P ∈ Prim(A): φ(P) = x} and Graphic. Then Graphic, the strict closure of Jx in M(A). Thus, Hx is strictly closed if and only if Graphic, and the ‘spectral synthesis’ question asks when this happens. In this paper, it is shown that, for σ-unital A, Hx is strictly closed for all x ∈ Im(φ) if and only if Jx is locally modular for all x ∈ Im(φ) and φ is a closed map relative to its image. Various related results are obtained.
Original languageEnglish
Pages (from-to)1-24
Number of pages24
JournalQuarterly Journal of Mathematics
Issue number1
Early online date22 Jan 2013
Publication statusPublished - 1 Mar 2014

Bibliographical note

We are grateful to the referee for a number of helpful comments and for pointing out an error in the original proof of Theorem 3.6.


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