The notion of soficity for a group is a weak type of finite approximation property that simultaneously generalizes both amenability and residual finiteness. In 2008 L. Bowen discovered how it can be used to significantly broaden the scope of the classical theory of dynamical entropy beyond the setting of amenable acting groups. This Arbeitsgemeinschaft aimed to provide a comprehensive picture of the subject of sofic entropy as it has developed over the last five years.
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Lewis Bowen, David Kerr, Arbeitsgemeinschaft: Sofic Entropy. Oberwolfach Rep. 10 (2013), no. 4, pp. 2919–2961DOI 10.4171/OWR/2013/50