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The Quarterly Journal of Mathematics
Article . 1996 . Peer-reviewed
Data sources: Crossref
The Quarterly Journal of Mathematics
Article . 1996 . Peer-reviewed
Data sources: Crossref
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THE LOCAL MULTIPLIER ALGEBRAOF A C*-ALGEBRA

The local multiplier algebra of a \(C^*\)-algebra
Authors: Somerset, D. W. B.;

THE LOCAL MULTIPLIER ALGEBRAOF A C*-ALGEBRA

Abstract

The author deals with the so-called local multiplier algebra \(M_{\text{loc}}(A)\) of a \(C^*\)-algebra \(A\). Recall that a closed two-sided ideal \(I\) in \(A\) is essential if its annihilator is equal to zero. The intersection of two essential ideals is essential, so the set of essential ideals of \(A\) forms a directed set. If \(I\) and \(J\) are essential ideals with \(I\supseteq J\), then there is an injective homomorphism from \(M(I)\), the multiplier algebra of \(I\), into \(M(J)\). Thus the set of multiplier algebras of essential ideals is a direct set. By definition, \(M_{\text{loc}}(A)\) is the closure of the algebraic inductive limit of this system; so \(M_{\text{loc}}(A)\) is a \(C^*\)-algebra. For an arbitrary \(C^*\)-algebra \(A\) let \(\text{Prim}(A)\) denote the space of primitive ideals, \(\text{MinPrimal}(A)\) the space of minimal closed primal ideals, and \(\text{MinSpec}(A)\) the space of minimal (not necessarily closed) primal ideals of \(A\). These spaces are equipped with hull-kernel topologies. Let Glimm \((A)\) denote the set of Glimm ideals equipped with the strongest topology for which the natural surjection \(\text{Prim}(A)\to\text{Glimm}(A)\) is continuous. Recall that \(C^*\)-algebras with extremally disconnected primitive space (i.e., disjoint open subsets have disjoint closures) are said to be boundedly centrally closed. In this paper the following basic results are proved: Theorem 1. A \(C^*\)-algebra \(A\) is boundedly centrally closed if and only if \(A\) is quasi-standard and \(\text{Glimm}(A)\) is extremally disconnected. -- Theorem 2. Let \(A\) be a boundedly centrally closed \(C^*\)-algebra. Then \(\text{Glimm}(M(A))\) is homeomorphic to \(\text{MinSpec}(M(A))\), where \(M(A)\) is the multiplier algebra of \(M\). -- Theorem 3. If \(A\) is a \(C^*\)-algebra, then \(M_{\text{loc}}(A)\) is standard. -- Corollary. If \(A\) is a \(C^*\)-algebra, then each minimal primal ideal of \(M_{\text{loc}}(A)\) is prime. -- Theorem 4. Let \(A\) be a \(C^*\)-algebra with \(\text{MinPrimal}(A)\) separable and set \(B=M_{\text{loc}}(A)\). The mapping \(P\mapsto P\cap A\) \((P\in\text{MinSpec}(B))\) is a homeomorphism from \(\text{MinSpec}(B)\) onto \(\text{MinSpec}(A)\).

Keywords

boundedly centrally closed, General theory of \(C^*\)-algebras, primitive ideals, hull-kernel topologies, primal ideals, multiplier algebra, Noncommutative topology, \(C^*\)-algebra, Homomorphisms and multipliers of function spaces on groups, semigroups, etc.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
4
Average
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