nuclear C*-algebra
Definition 0.1.
A C*-algebra is called a nuclear C*-algebra if all C*-norms on every algebraic tensor product , of with any other C*-algebra , agree with, and also equal the spatial C*-norm (viz Lance, 1981). Therefore, there is a unique completion of to a C*-algebra , for any other C*-algebra .
0.1 Examples of nuclear C*-algebras
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All commutative C*-algebras and all finite-dimensional C*-algebras
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Group C*-algebras of amenable groups
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Crossed products of strongly amenable C*-algebras by amenable discrete groups,
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Type C*-algebras.
0.2 Exact C*-algebra
In general terms, a -algebra is exact if it is isomorphic with a -subalgebra of some nuclear -algebra. The precise definition of an exact -algebra follows.
Definition 0.2.
Let be a matrix space, let be a general operator space, and also let be a C*-algebra. A -algebra is exact if it is ‘finitely representable’ in , that is, if for every finite dimensional subspace in and quantity , there exists a subspace of some , and also a linear isomorphism such that the -norm
0.3 Note: A counter-example
A -subalgebra of a nuclear C*-algebra need not be nuclear.
References
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1
E. C. Lance. 1981. Tensor Products and nuclear C*-algebras., in Operator
Algebras and Applications, R.V. Kadison, ed., Proceed. Symp. Pure Maths., 38: 379-399, part 1.
- 2 N. P. Landsman. 1998. “Lecture notes on -algebras, Hilbert -Modules and Quantum Mechanics”, pp. 89 http://planetmath.org/?op=getobj&from=books&id=66a graduate level preprint discussing general C*-algebras http://aux.planetmath.org/files/books/66/C*algebrae.psin Postscript format.
Title | nuclear C*-algebra |
Canonical name | NuclearCalgebra |
Date of creation | 2013-03-22 18:12:25 |
Last modified on | 2013-03-22 18:12:25 |
Owner | bci1 (20947) |
Last modified by | bci1 (20947) |
Numerical id | 63 |
Author | bci1 (20947) |
Entry type | Definition |
Classification | msc 81T05 |
Classification | msc 81R50 |
Classification | msc 81R15 |
Synonym | quantum operator algebra |
Synonym | C*-algebra |
Synonym | -algebra |
Related topic | QuantumOperatorAlgebrasInQuantumFieldTheories |
Related topic | NoncommutativeGeometry |
Related topic | GroupoidCConvolutionAlgebra |
Related topic | GroupoidCDynamicalSystem |
Related topic | CAlgebra3 |
Related topic | CAlgebra |
Related topic | QuotientsInCAlgebras |
Defines | generated C*-algebra |
Defines | exact C^*-algebra |
Defines | group C*-algebra |