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Lookup NU author(s): Professor Guyan Robertson
Consider a compact locally symmetric space M of rank r, with fundamental group Γ. The von Neumann algebra VN (Γ) is the convolution algebra of functions f ∈ ℓ2(Γ) which act by left convolution on ℓ2(Γ). Let Tr be a totally geodesic flat torus of dimension r in M and let Γ0≅ ℤr be the image of the fundamental group of Tr in Γ. Then VN(Γ0) is a maximal abelian *-subalgebra of VN(Γ) and its unitary normalizer is as small as possible. If M has constant negative curvature then the Pukánszky invariant of VN (Γ0) is ∞. © 2005 Elsevier Inc. All rights reserved.
Author(s): Robertson G
Publication type: Article
Publication status: Published
Journal: Journal of Functional Analysis
Year: 2006
Volume: 230
Issue: 2
Pages: 419-431
ISSN (print): 0022-1236
ISSN (electronic): 1096-0783
Publisher: Academic Press
URL: http://dx.doi.org/10.1016/j.jfa.2005.04.009
DOI: 10.1016/j.jfa.2005.04.009
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