Rotation Algebras and the Exel Trace Formula
Rotation Algebras and the Exel Trace Formula
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DOI:
10.4153/cjm-2014-032-2
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发表时间:
2013-08
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通讯作者:
Jiajie Hua;Huaxin Lin
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文献类型:
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作者:
Jiajie Hua;Huaxin Lin
Abstract We show that if $u$ and $v$ are any two unitaries in a unital ${{C}^{*}}$ –algebra such that $\left\| uv\,-\,vu \right\|\,\,0$ , we prove that there exists $\delta \,>\,0$ satisfying the following: if $u$ and $v$ are two unitaries in any unital simple ${{C}^{*}}$ –algebra $A$ with tracial rank zero such that $$\left\| uv\,-\,{{e}^{2\pi i\theta }}vu \right\|\,<\,\delta \,\,\,\text{and}\,\,\frac{1}{2\pi i}\tau \left( \log \left( uv{{u}^{*}}{{v}^{*}} \right) \right)\,=\,\theta ,$$ for all tracial states $\tau$ of $A$ , then there exists a pair of unitaries $\widetilde{u}$ and $\widetilde{v}$ in $A$ such that $$\widetilde{u}\widetilde{v}\,=\,{{e}^{2\pi i\theta }}\widetilde{v}\widetilde{u},\,\,\,\,\,\,\,\left\| u\,-\,\widetilde{u} \right\|\,<\,\in \,\,\,\text{and}\,\,\left\| v\,-\,\widetilde{v} \right\|\,<\,\in.$$