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Nonnuclear subalgebras of AF algebras
- American Journal of Mathematics
- Johns Hopkins University Press
- Volume 122, Number 3, June 2000
- pp. 581-597
- 10.1353/ajm.2000.0018
- Article
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We show that any non-type I separable unital AF algebra B can be modeled from inside by a nonnuclear C*-algebra and from outside by a nonexact C*-algebra. More precisely there exist unital separable quasidiagonal C*-algebras A ⊂ B ⊂ C of real rank zero, stable rank one, such that A is nonnuclear, C is nonexact, and both A and C are asymptotically homotopy equivalent to B. In particular A, B and C have the same ordered K-theory groups, hence isomorphic ideal lattices, and, A and B have (affinely) homeomorphic trace spaces.