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math.OA2001
Fourier Invariant Partially approximating subalgebras of the irrational rotation C*-algebra
S. Walters
For all transcendental parameters, the irrational rotation algebra is shown to contain infinitely many C*-subalgebras satisfying the following properties. Each subalgebra is isomor…
math.OA2001
Discrete Cocompact subgroups of G_53 and related C*-algebras
P. Milnes, S. Walters
The discrete cocompact subgroups of the 5-dimensional Lie group G_53 are determined up to isomorphism. Each of their group C*-algebras is studied by determining all of its simple i…
math.OA2000
On Fourier orthogonal projections in the rotation algebra
Sam Walters
Projections are constructed in the rotation algebra that are orthogonal to their Fourier transform and which are fixed under the flip automorphism. Such projections are expected in…