Geodesic
An entropy for $ℤ^2$ -actions with finite entropy generators
Fundamenta Mathematicae, Tome 157 (1998) no. 2, pp. 209-220
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We study a definition of entropy for $ℤ^+ × ℤ^+$-actions (or $ℤ^2$-actions) due to S. Friedland. Unlike the more traditional definition, this is better suited for actions whose generators have finite entropy as single transformations. We compute its value in several examples. In particular, we settle a conjecture of Friedland [2]. 
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     title = {An entropy for $\ensuremath{\mathbb{Z}}^2$ -actions with finite entropy generators},
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W. Geller; M. Pollicott. An entropy for $ℤ^2$ -actions with finite entropy generators. Fundamenta Mathematicae, Tome 157 (1998) no. 2, pp. 209-220. doi: 10.4064/fm-157-2-3-209-220

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