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In algebra, a module spectrum is a spectrum with an action of a ring spectrum; it generalizes a module in abstract algebra.
The ∞-category of (say right) module spectra is stable; hence, it can be considered as either analog or generalization of the derived category of modules over a ring.
Lurie defines the K-theory of a ring spectrum R to be the K-theory of the ∞-categoryofperfect modules over R (a perfect module being defined as a compact object in the ∞-category of module spectra.)
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