Definition 8.1.7 (Perfect module). Let \(R\) be an associative ring spectrum. We denote by \[ \Perf (R) \subseteq \LMod _R \] the smallest thick subcategory containing the regular left \(R\)-module \(R\), where a subcategory is called thick if it is stable and closed under retracts. A left \(R\)-module is called perfect if it belongs to \(\Perf (R)\).
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