An Inductive Limit Model for the $K$ -Theory of the Generator-Interchanging Antiautomorphism of an Irrational Rotation Algebra
Canadian mathematical bulletin, Tome 46 (2003) no. 3, pp. 441-456
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Let ${{A}_{\theta }}$ be the universal ${{C}^{*}}$ -algebra generated by two unitaries $U,\,V$ satisfying $VU\,=\,{{e}^{2\pi i\theta }}UV$ and let $\Phi $ be the antiautomorphism of ${{A}_{\theta }}$ interchanging $U$ and $V$ . The $K$ -theory of ${{R}_{\theta }}\,=\,\{a\,\in \,{{A}_{\theta }}\,:\,\Phi (a)\,=\,{{a}^{*}}\}$ is computed. When $\theta $ is irrational, an inductive limit of algebras of the form ${{M}_{q}}(C(\mathbb{T}))\,\oplus \,{{M}_{{{q}'}}}(\mathbb{R})\,\oplus \,{{M}_{q}}(\mathbb{R})$ is constructed which has complexification ${{A}_{\theta }}$ and the same $K$ -theory as ${{R}_{\theta }}$ .
Stacey, P. J. An Inductive Limit Model for the $K$ -Theory of the Generator-Interchanging Antiautomorphism of an Irrational Rotation Algebra. Canadian mathematical bulletin, Tome 46 (2003) no. 3, pp. 441-456. doi: 10.4153/CMB-2003-044-0
@article{10_4153_CMB_2003_044_0,
author = {Stacey, P. J.},
title = {An {Inductive} {Limit} {Model} for the $K$ {-Theory} of the {Generator-Interchanging} {Antiautomorphism} of an {Irrational} {Rotation} {Algebra}},
journal = {Canadian mathematical bulletin},
pages = {441--456},
year = {2003},
volume = {46},
number = {3},
doi = {10.4153/CMB-2003-044-0},
url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-044-0/}
}
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