# Journal of Operator Theory

Volume 42, Issue 2, Fall 1999 pp. 351-370.

A simple $C^*$-algebra arising from a certain subshift**Authors**: Kengo Matsumoto

**Author institution:**Department of Mathematics, Joetsu University of Education, Joetsu 943--8512, Japan

**Summary:**We present an example of a subshift whose associated $C^*$-alge\-bra is simple, purely infinite and not isomorphic to any Cuntz-Krieger algebra and Cuntz algebra. The subshift is called the context free shift. We will compute the topological entropy for the subshift and show that the KMS-state for the gauge action on the associated $C^*$-algebra exists if and only if the inverse temperature is $\log( 1 + \sqrt{1 + \sqrt{3}}) = 2.652\ldots = $ the topological entropy for the subshift, and the corresponding KMS-state is unique.

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