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The Category of Bratteli Diagrams

Published online by Cambridge University Press:  20 November 2018

Massoud Amini
Affiliation:
Department of Pure Mathematics, Faculty of Mathematical Sciences, Tarbiat Modares University, Tehran, Iran. e-mail: [email protected], [email protected]
George A. Elliott
Affiliation:
Department of Mathematics, University of Toronto, Toronto, ON, M5S 2E4. e-mail: [email protected]
Nasser Golestani
Affiliation:
Department of Pure Mathematics, Faculty of Mathematical Sciences, Tarbiat Modares University, Tehran, Iran. e-mail: [email protected], [email protected]
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Abstract

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A category structure for Bratteli diagrams is proposed and a functor from the category of $\text{AF}$ algebras to the category of Bratteli diagrams is constructed. Since isomorphism of Bratteli diagrams in this category coincides with Bratteli’s notion of equivalence, we obtain in particular a functorial formulation of Bratteli’s classification of $\text{AF}$ algebras (and at the same time, of Glimm’s classification of $\text{UHF}$ algebras). It is shown that the three approaches to classification of $\text{AF}$ algebras, namely, through Bratteli diagrams, $\text{K}$-theory, and a certain natural abstract classifying category, are essentially the same from a categorical point of view.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2015

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