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A CHARACTERISATION OF CENTRAL ELEMENTS IN $C^{\ast }$ -ALGEBRAS

Part of: Selfadjoint operator algebras Special classes of linear operators

Published online by Cambridge University Press:  19 October 2016

LAJOS MOLNÁR
LAJOS MOLNÁR*
Affiliation:
Department of Analysis, Bolyai Institute, University of Szeged, H-6720 Szeged, Aradi vértanúk tere 1, Hungary MTA-DE ‘Lendület’ Functional Analysis Research Group, Institute of Mathematics, University of Debrecen, H-4010 Debrecen, PO Box 12, Hungary email molnarl@math.u-szeged.hu
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Abstract

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Wu [‘An order characterization of commutativity for $C^{\ast }$ -algebras’, Proc. Amer. Math. Soc.129 (2001), 983–987] proved that if the exponential function on the set of all positive elements of a $C^{\ast }$ -algebra is monotone in the usual partial order, then the algebra in question is necessarily commutative. In this note, we present a local version of that result and obtain a characterisation of central elements in $C^{\ast }$ -algebras in terms of the order.

Keywords

C ∗ -algebracentral elementorderexponential function

MSC classification

Primary: 46L05: General theory of $C^*$-algebras
Secondary: 47B49: Transformers, preservers (operators on spaces of operators)
Type
Research Article
Information
Bulletin of the Australian Mathematical Society , Volume 95 , Issue 1 , February 2017 , pp. 138 - 143
Copyright
© 2016 Australian Mathematical Publishing Association Inc. 

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